Digital Bus Switch Selection Guide Digital Bus Switch Introduction

TM Technology for Innovators

Texas Instruments (TI) has a long history As core system components are migrat- family is the only pure solution available Introduction in the digital bus switch market. TI was ing to low-voltage supplies, TI has been with the capability to translate from 5 V the first to introduce the 3.3-V low- actively expanding its portfolio into next- down to 2.5 V. voltage bus switch (CBTLV) and continues generation, low-voltage bus switches. To complement its broad line of bus to make major technology advances in The CBTLV family, the first FET switch switch families, TI offers packaging this market. TI’s digital switches (also devices designed for 3.3 V, supports options to satisfy the most space-critical referred to as bus switches) are designed next-generation, low-voltage systems. The applications. TI offers bus switch functions to quickly turn on/off the connection to a new CB3Q is a 3.3-V family that offers in its single-gate Little Logic portfolio, high-speed digital line or bus. TI bus low flat ron for high-performance systems. Decision Tree housed in the small packages SC-70 switches provide industry-standard func- The 2.5-V/3.3-V voltage translator family, and SOT-23; as well as Widebus and tions and pinouts (i.e., ’244, ’245) in a full CB3T, provides a high-performance, Widebus+™ functions in space-saving range of bit widths (from 1-bit Little Logic low-power voltage translation interface BGA options. to 32-bit Widebus™). TI bus switches solution for a variety of applications. The feature subnanosecond propagation delays, low on-resistance, low input/ Bus Switch Supply Voltage and Signal Frequency output capacitance and bandwidths up to 500 MHz.

Technical Overview Technical 5 CBT/ TI offers over 70 different functions in its CBT-C broad line of FET switches, bus switches, 4 bus exchanges and multiplexer/demultiplexer switches. Whether it is for isola- 3 CB3T CBTLV CB3Q tion, translation or bus-exchange needs, TI’s crossbar technology portfolio has 2 Supply Voltage (V) Supply Voltage Applications the right device. TI’s 5-V bus switch product line includes 1 the general-purpose CBT family, TI’s original bus switch family; as well as the 0 new CBT-C family, which provides 100 200 500 undershoot protection down to –2 V. Signal Frequency (MHz)

Selection Guide Bus Switch Function and Bit Width Two-Port MUX/DeMUX Bus Exchange A B 1A 11B 1A1 1B1

1B2 OE Cross-Reference

OE 1A2 1B2 CBT CBT-C CB3T CBTLV CB3Q Control 1 Bit S Logic 2 Bit 4 Bit 8 Bit OE Packaging 10 Bit Control 16 Bit CBT CBT-C CB3T CBTLV CB3Q S 20 Bit 4 x 1:2 Bit Logic 24 Bit 12 x 1:2 Bit 32 Bit PPP16 x 1:2 Bit P = Planned 12 x 1:3 Bit 2 x 1:4 Bit CBT CBT-C CB3T CBTLV CB3Q 1 x 1:8 Bit 10 Bit P 1 x 16:32 Bit 18 Bit 24 Bit P Resources P = Planned

www.ti.com/signalswitches 2 Texas Instruments Digital Bus Switch Selection Guide Digital Bus Switch Introduction (Continued)

Comparison of Typical ron vs. VI for the CBT, CBTLV and CB3Q Bus Switch Families Introduction 120

TA = 25°C 100 I = –15 mA

Ω O

on 80 Decision Tree CBT/CBT-C 60 (5-V VCC )

CBTLV On-State Resistance, r20 ( ) (3.3-V V ) CB3Q CC Overview Technical (3.3-V VCC ) 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

VI (V) Applications

Digital Signal Considerations

VCC — There are a number of to the line impedance to allow for proper Number of Bits Required To Be Switched — considerations and tradeoffs here. What matching and to prevent unwanted signal With TI’s wide variety of signal switches, it voltage levels are present on the board? reflections. For nontransmission-line connec- is possible to switch between 1 to 32 bits at

What is the amplitude of the signal levels to tions, the switch ron and the load resistance the same time with a single device. For be passed? Is level translation required? form an undesired voltage divider. In this instance, the LVC1G66 or CBT1G125 can case, a switch with a r small enough to be used to switch a single bit, while the Selection Guide V /V — Switch control (enable). How will on IH IL ensure that the switch output is not reduced CBTLV16211 is capable of switching a total the switch be controlled? Logic level output? below a valid input high level (V ) for the 24 bits in banks of 12. Or, by tying the Comparator? ASIC? Should the switch turn IH connected load. As mentioned previously, adjacent enable pins together, it is possible on if the control signal is high or low? the tradeoff for low ron is often higher signal- to control 24 bits with one enable signal. Switch Output Level — The maximum path capacitance, which reduces frequency Special Features — TI offers bus switches signal level that a switch without a charge response. with special features, such as a bus-hold pump can pass is limited to the switch VCC. ten/tdis — These parameters determine how option (CBTH) for holding floating or unused Is there sufficient noise margin on the device Cross-Reference quickly the switch can respond to a desired I/O pins at valid logic levels; an integrated downstream of the switch such that signal on or off state. In general, switch enable and series resistor option (CBTR) to reduce attenuation in the switch will not cause data disable times are not symmetrical. This is not signal-reflection noise; and precharge to errors? For instance, the n-channel transistor usually an issue, as few applications require support hot plugging. of a CBT device clamps the switch output at high control (enable) signal frequencies. a little more than 1 V below the operating

VCC, making it unsuitable for 5-V CMOS tpd — This parameter is negligible for all but

high-level (VIH = 3.5 V) signal transmission the most critical timing budgets. When the Packaging unless operated from at least 4.5-V VCC. switch is on, the propagation delay through the pass transistor(s) is minimal. TI specifies r — Is the switch connected to a trans- on this number as the mathematical calculation mission line? If so, what is the impedance? of the typical ron times the load capacitance. The switch ron should be less than or equal Resources

Texas Instruments Digital Bus Switch Selection Guide 3 www.ti.com/signalswitches Digital Bus Switch Introduction (Continued)

Digital Switches—Control Signal Levels (VIH, VIL) Introduction

CBT/CBT-CCB3T CBTLV CB3Q = Input Signal Range

= Supply Voltage

5 = Input Threshold Decision Tree

4 Supply Voltage (V) Supply Voltage 3

VIH VIH VIH VIH

Technical Overview Technical 2

VIH VIH VIH

1 VIL VIL VIL VIL 0.8 0.7

Control Signal Levels VIL VIL VIL Applications 0 TTL TTL 2.5-V TTL2.5-V TTL 2.5-V CMOS CMOS CMOS

Digital Switches—Signal Level Through the Switch

Output Signal

Selection Guide 4 CBT/CBT-C 3 CBT/CBT-C V = 5 V 2 V = 4.3–5 V CC 1 CC 0 CBT/CBT-C –1 Output Signal VCC = 4.3–5 V CBT/CBT-C CBTLV 5 5 VCC = 4.3 V VCC = 3.3 V 5-V Input Signal 4 3.3-V Input Signal 4 2.5-V Input Signal Output Signal 3 3 CBTLV 2 2 5 5 5 1 1 VCC = 2.5–3.3 V 5 4 CB3T 0 4 CB3Q 0 4 4 3 –1 3 –1 3 3 2 VCC = 3.3 V 2 VCC = 2.5–3.3 V 2 2

Cross-Reference 1 1 1 1 0 5 0 0 CB3Q 0 –1 4 –1 –1 –1 CB3T 3 CB3T VCC = 2.5–3.3 V V = 2.5 V 2 VVcc: = 3.33.3 VV CC 1 CC 0 –1 Output Signal CB3T V = 2.5–3.3 V 5 5 CC 4 4 CB3Q 3 CB3T 3 V = 3.3 V 2 V = 2.5 V 2 Packaging CC 1 CC 1 0 0 –1 –1 Resources

www.ti.com/signalswitches 4 Texas Instruments Digital Bus Switch Selection Guide Digital Bus Switch Decision Tree

Digital Bus Switch Introduction

Level Translation Signal Switching

Frequency ≤10 MHz ≤20 MHz ≤100 MHz ≤200 MHz ≤200 MHz ≤500 MHz (Data I/O) Decision Tree 2.5 V 2.5 V 2.5 V VCC 5 V 5 V 5 V 3.3 V 3.3 V 3.3 V

Beyond ≤≤ Rail-to-Rail VCC V I/O 5-V Not Rail-to-Rail (0 to 4 V) (0 to 5 V With VI/O Level 5 V to 3.3 V 5 V to 3.3 V Translation Rail-to-Rail to V 3.3-V VCC ) CC (0 to 3.3 V With 2.5-V VCC )

Undershoot Overview Technical Yes Yes Yes Yes Protection No (–2 V) No No (–0.5 V) (–2 V) (–2 V) No No (Switch OFF)

Undershoot Clamping –0.5 V –0.5 V –0.5 V –0.5 V –0.5 V –0.5 V –0.5 V –0.5 V –0.5 V (Switch ON) Applications

µ ICC 1.5 mA 1.5 mA 40 A 3 µA 3 µA 3 µA 3 µA 10 µA 2 mA

Yes Yes Yes Yes Yes Yes I OFF No (10 µA) (10 µA) No No (20 µA) (10 µA) (10 µA) (1 µA)

• 2 Port • 2 Port • 2 Port • 2 Port • 2 Port • 2 Port • 2 Port • 2 Port • 2 Port • MUX • MUX • MUX • Bus- • MUX • MUX • MUX Configuration • Bus- • Bus- Exchange • Bus- • Bus- • Bus- Selection Guide Exchange Exchange Exchange Exchange Exchange

Solution CBTD CBTD-CCB3T CBT CBTS CBTK CBT-C CBTLV CB3Q Cross-Reference Packaging Resources

Texas Instruments Digital Bus Switch Selection Guide 5 www.ti.com/signalswitches Digital Bus Switch Technical Overview

3.3-V LOW-VOLTAGE BUS SWITCHES Introduction More systems are moving to low-voltage CBTLV3245 Logic Diagram (3.3-V) supplies, the chief benefits of which are low power consumption and higher performance. With digital elec- FET Switch tronics running at ever-higher speeds, 2 18 A1 SW B1 (Simplified Schematic) every barrier to system performance must be removed. High-speed micro- Decision Tree processors, synchronous DRAMs and OE new bus architectures all require sup- porting logic that keeps data moving 9 11 fast. TI’s portfolio of low-voltage bus A8 SW B8 AB switches brings greater system speed and reduced power consumption to designers of high-end workstations, OE portable computers, hard disk drives, 19 Technical Overview Technical industrial control systems and telecom- OE munications equipment. OE CBTLV—2.5-V/3.3-V General- Purpose Bus Switch Family CBTLV On-State Resistance and Output vs. Input Voltage

CBTLV Features Applications

• Rail-to-rail switching (0 to VCC) 25 3 Ω • Low ron (5 Ω) () • Low input/output capacitance (4.5 pF) on 20 • Low power consumption • High current capacity per channel 2

15 (V) • ESD performance (2-kV HBM) O V V O • Undershoot clamp diode •I for partial-power-down mode 10 off 1 Selection Guide operation ron

• Supports both digital and analog On-State Resistance, r 5 applications 0 0 In its continuing drive to provide low- 0123

voltage solutions, TI was the first to offer VI (V) these devices designed for 3.3 V. CBTLV VCC = 3.3 V devices can be used in multiprocessor

Cross-Reference systems as fast bus connections, bus- Signal Integrity Performance Using a CBTLV3125 exchange switches for crossbar systems, 3.5 memory interleaving or bus-byte swap- ping. They also can be used to replace 3.0 relays, improving connect/disconnect 2.5 speed and eliminating relay reliability 2.0 problems. The CBTLV family, designed Packaging 1.5 to operate at 3.3 V, furthers the goal of an integrated system operating with 1.0 LVTTL voltages. 0.5 Input and Output (V) 0.0 VI VO –0.5 01020304050 Time (ns) Resources ° VCC = 3.3 V, T A = 25 C, f IN = 66 MHz, C L = 15 pF

www.ti.com/signalswitches 6 Texas Instruments Digital Bus Switch Selection Guide Digital Bus Switch Technical Overview (Continued)

3.3-V LOW-VOLTAGE BUS SWITCHES (Continued) Introduction CB3Q—2.5-V/3.3-V Low-Voltage CB3Q3245 Logic Diagram Bus Switch Family

CB3Q Features 2 18 AB • Low and flat r characteristics over A1 SW B1 on VCC operating range • High-bandwidth (500 MHz) OE Charge Decision Tree • 0- to 5-V rail-to-rail switching on data Pump 9 11 I/O ports A8 SW B8 • Bidirectional flow with near-zero propagation delay OE • Low power consumption 19 • ESD performance (2-kV HBM) OE • Undershoot clamp diodes EN •Ioff for partial-power-down mode

operation CB3Q Input and Output Voltage vs. Time Overview Technical • Supports both digital and analog 3.0 applications The new CB3Q family provides high- 2.5 performance, low-power replacements 2.0 for standard bus interface devices when Output

signal buffering (current drive) is not Applications 1.5 required. The CB3Q 2.5-V/3.3-V low- Input voltage bus switch family offers very 1.0 low and flat ron, 0- to 5-V rail-to-rail input/ output (RRIO) switching and very low 0.5

I/O capacitance to minimize data bus Input and Output (V) capacitive loading and signal distortion. 0 Specifically designed to support today’s

computing and networking applications, –0.5 Selection Guide the CB3Q family provides a high- 0 12345 Time (ns) performance interface solution ideally fIN = 420 MHz, Load = 500 Ω suited for broadband communications and networking infrastructure equipment (switches, routers, hubs, wireless base CB3Q On-State Resistance and Output vs. Input Voltage stations, DSLAMs, LAN/WAN, network storage), as well as other data-intensive applications (Gigabit Ethernet routers, Cross-Reference

ATM switches, SONET/ATM multiplexers, Ω servers, workstations, video processing () 30 6 USB and PCI interface applications). The on CB3Q bus switch family offers the features 25 5 (V) and performance necessary to optimize O 20 4 V high-performance system designs. VO Packaging 15 3

10 2 ron

On-State Resistance, r 5 1

00 012345678 VI (V)

VCC = 3.3 V Resources

Texas Instruments Digital Bus Switch Selection Guide 7 www.ti.com/signalswitches Digital Bus Switch Technical Overview (Continued)

3.3-V LOW-VOLTAGE BUS SWITCHES (Continued) Introduction CB3T—2.5-V/3.3-V Voltage CB3T3245 Logic Diagram Translator Bus Switch Family

2 18 CB3T Features A1 SW B1 • 3.3-V bus switch with translation fully A B supports mixed-mode signal operation OE • 5-V input to 3.3-V output level shift Control Control Circuit Circuit Decision Tree with VCC = 3.3 V 9 11 A8 SW B8 • 5- and 3.3-V input to 2.5-V output level shift with VCC = 2.5 V OE • High current capacity per channel 19 OE •Ioff for partial-power-down mode OE operations • ESD performance (2-kV HBM) Voltage Translation for External Monitor Terminal in Notebook PC • Very low ICC, ideal for notebooks and 5-V VCC Technical Overview Technical other portable products for standard PC Power bus interface devices when signal 3V buffering (current drive) is not required 3-V Signal

Developed to complement TI’s existing CB3T3306 CBT and CBTLV bus switch products, 1OE VCC the new CB3T family provides high- Graphic Data Controller 1A 2OE Applications performance, low-power replacements CLK Monitor for standard bus-interface devices when 1B 2B CLK Data signal buffering (current drive) is not GND 2A required. The CB3T 2.5-V/3.3-V voltage- translator bus switch family fully supports Sub mixed-mode signal operation on all data Connector ports and is ideally suited for mixed 2.5-, 3.3- and 5.5-V system environments. (memory, processors, logic, ASICs, I/O solution ideally suited for laptop computers,

Selection Guide The CB3T bus switches provide 5-V peripherals, etc.) that require the different PDAs, cell phones and any accompany- input to 3.3-V output level shifting with a signaling standards (TTL, LVTTL, etc.) ing docking stations. The CB3T bus 3.3-V VCC, and 5- or 3.3-V input to 2.5-V common in mixed-mode environments. switch family offers the features and output level shifting with a 2.5 V. This Specifically designed to support today’s performance necessary to optimize both voltage-translation feature allows the CB3T portable computing and communications mixed-mode-signal and power-critical family to provide a high-performance applications, the CB3T family provides a portable system designs. interface between a myriad of components high-performance, low-power interface

Cross-Reference CB3T Input vs. Output With 3.3-V Supply CB3T Input vs. Output With 2.3-V Supply 4 4

3 3

(V) (V) O O

Packaging 2 2 Output, V Output, V 1 1

0 0 0123456 0123456

Input, VI (V) Input, VI (V) Resources ° µ ° µ VCC = 3.3 V, T A = 25 C, IO = 1 A VCC = 2.3 V, T A = 25 C, IO = 1 A

www.ti.com/signalswitches 8 Texas Instruments Digital Bus Switch Selection Guide Digital Bus Switch Technical Overview (Continued)

3.3-V LOW-VOLTAGE BUS SWITCHES (Continued) Introduction CB3T—2.5-V/3.3-V Voltage Translator Bus Switch Family (Continued) Output With 5-V Input and 3.3-V Supply Output With 3.3-V Input and 2.5-V Supply 6 6

VI 5 5 ) ) V V ( ( 4 4 VI Decision Tree 3 VO 3 V 2 2 O

1 1 Input and Output Input and Output 0 0

–1 –1 0 0.5 1.0 1.5 2.0 0 0.5 1.0 1.5 2.0 Time (µs) Time (µs) Overview Technical

fIN = 1 MHz, V CC = 3.3 V, C L = 15 pF fIN = 1 MHz, V CC = 2.5 V, C L = 15 pF

Output With 3-V Input and 3-V Supply Output With 3-V, 100-MHz Input and 3.3-V Supply 4 4

VI Applications

) 3 ) 3 V V ( ( VO 2 2

1 1

Input and Output 0 Input and Output 0 Selection Guide

VI VO –1 –1 0 0.5 1.0 1.5 2.0 0510 15 20 25 30 Time (µs) Time (ns)

fIN = 1 MHz, V CC = 3 V, C L = 15 pF fIN = 100 MHz, V CC = 3.3 V, C L = 15 pF

— Port Input Current With 0- to 5.5-V Input and 0-V Supply Control Input Current With 0- to 5.5-V OE and 0-V Supply Cross-Reference 10 10

8 A) 8 µ A) µ I IN 6 6 Packaging 4 4 Input Current, I ( Input Current, I ( 2 2

0 0 0123456 0123456 Input A, V (V) Enable Input, OE (V) —- I VCC = 0 V, OE = 0 V, Input B = 0 V VCC = 0 V, Inputs A and B = 0 V Resources

Texas Instruments Digital Bus Switch Selection Guide 9 www.ti.com/signalswitches Digital Bus Switch Technical Overview (Continued)

5-V BUS SWITCHES Introduction TI also offers a broad line of 5-V bus CBT3245C Logic Diagram switches. CBT, TI’s original bus switch family, fast became an industry standard for many isolation, translation and bus- 2 18 exchange needs. The new CBT-C bus A1 SW B1 AB switch family offers a number of improve- ments over the original CBT family, OE Decision Tree including –2-V undershoot protection, Undershoot faster enable/disable times, improved ESD 9 11 B A8 SW B8 Protection Circuit protection and an Ioff feature for partial- power-down applications. The CBT and OE CBT-C technologies are the easy choice for designers’ 5-V bus switch applications. 19 OE CBT-C—5-V Bus Switch Family EN

Technical Overview Technical With –2-V Undershoot Protection CBT-C Undershoot Protection When Switch Is Off

CBT-C Features 7.5 • Undershoot protection to –2 V •Ioff for partial-power-down mode Output operations 5.0 • ESD protection (2-kV HBM and Applications 1-kV CDM) 2.5 • Improved enable/disable (ten/tdis = 3.5 to 4.0 ns) • Lower ron 0 • Low power consumption Input Input and Output (V) • Supports both digital and analog –2.5 applications

Selection Guide The improved undershoot characteristics –5.0 of the CBT-C family are particularly 0 12 24 36 48 60 important in system environments Time (ns) where signal reflections and undershoot VCC = 5 V, TA = 25˚C, VIL = –2 V, VIH = 5.5 V are common, such as in those utilizing CBT-C On-State Resistance and Output vs. Input Voltage the PCI bus. With respect to proper bus switch operation, undershoot is a con- cern when a switch is in the off state.

Cross-Reference 25 5 With FET switches without undershoot Ω

protection, an undershoot event on one ()

of the data ports can inadvertently turn on 20 4 the switch on, creating possible bus

contention and data corruption. TI’s CBT-C 15 3 (V) V O O V active undershoot protection circuitry provides protection for undershoot down Packaging 10 2 to –2 V by sensing an undershoot event ron and ensuring the switch remains in the 5 1 proper off state. The middle figure at On-State Resistance, r right shows the CBT-C undershoot pro- 0 tection performance when the switch is 0 0123 45 disabled. There is very little variation in V (V) the output voltage due to the input volt- I VCC = 5 V Resources age undershoot.

www.ti.com/signalswitches 10 Texas Instruments Digital Bus Switch Selection Guide Digital Bus Switch Technical Overview (Continued)

5-V BUS SWITCHES (Continued) Introduction CBT—5-V Bus Switch Family CBT3245 Logic Diagram

CBT Features • Low ron 2 18 A1 SW B1 • Low input capacitance Source Drain • Low power consumption A B • High current capacity per channel OE

Gate Decision Tree • Precharge for hot card insertion N-Channel (CBT6800) Field Effect 9 11 • CBTD designed for level-shifting A8 SW B8 Transistor (NFET) applications • Supports both digital and analog OE applications OE 19 Power and speed are two primary con- OE cerns in today’s computing market. CBT can address these issues in bus-interface Overview Technical applications. CBT enables a bus-interface Output vs. Supply Voltage device to function as a very fast bus 5 switch, effectively isolating buses when the switch is open and offering very little propagation delay when the switch is 4

closed. These devices can function as high- Applications speed bus interfaces between computer- O 3 system components, such as the central processing unit (CPU) and memory. 2 Output, V (V) 1

3.0 3.5 4.0 4.5 5.0 Selection Guide

Supply, VCC (V)

CBT On-State Resistance and Output vs. Input Voltage

25 5

Cross-Reference Ω ()

on 20 4

15 3 (V) V O O V

10 2 Packaging ron 5 1 On-State Resistance, r

0 0 0123 45

VI (V) VCC = 5 V Resources

Texas Instruments Digital Bus Switch Selection Guide 11 www.ti.com/signalswitches Applications

SN74CBT34X245 Bus Switch For More Information CBT Bus Switch Home Page: Introduction Specially Designed for Hot Product Folder: www.ti.com/signalswitches www.ti.com/sc/device/SN74CBT34X245 Plugging ATA RAID Hard Disk For up-to-date information to support your www.ti.com/sc/device/SN74CBT16245 design and development needs, visit: Overview of ATA/EIDE support.ti.com By far, the most popular interface used Data Sheet: in modern hard disks is the one most www-s.ti.com/sc/techlit/scds089c commonly known as IDE. This interface www-s.ti.com/sc/techlit/scds070c is also known by a truly staggering Decision Tree variety of other names such as ATA, ATA/EIDE Pin Configuration ATA/ATAPI, EIDE, ATA-2, Fast ATA, ATA-3, Drive Reset 1 2 Ground Ultra ATA, Ultra DMA and many more. Data Bit 7 3 4 Data Bit 8 Data Bit 6 5 6 Data Bit 9 With a data bus width of 16 bits, the Data Bit 5 7 8 Data Bit 10 Data Bit 4 9 10 Data Bit 11 ATA/EIDE bus speeds are grouped into Data Bit 3 11 12 Data Bit 12 Data Bit 2 13 14 Data Bit 13 three operating frequencies: 66 MBps, Data Bit 1 15 16 Data Bit 14 100 MBps and 133 MBps. Data Bit 0 17 18 Data Bit 15 Ground 19 20 Key (Pin Removed) DMA Request 21 22 Ground Technical Overview Technical The switching level of the ATA/EIDE bus I/O Write 23 24 Ground is based on a 5-V supply and is compati- I/O Read 25 26 Ground I/O Channel Ready 27 28 Spindle Sync/Cable Select ble with 5-V TTL. DMA Acknowledge 29 30 Ground Interrupt Request 31 32 16-Bit I/O Because the IDE bus standard does not Drive Address Bus 1 33 34 Passed Diagnostic Drive Address Bus 0 35 36 Drive Address Bus 2 include hot plugging features (the capa- Drive Chip Select 0 37 38 Drive Chip Select 1 bility to insert or remove cards without Drive Active/Slave Present 39 40 Ground

Applications causing damage to the system and without having to disable the power), most designers use external bus switches to CBT in ATA RAID Application isolate the controller from the hard disk. To eliminate additional delays that will impact system performance using standard logic buffers, near-zero delay bus switches are used to transmit data along Selection Guide the cable. ATA For hot plug capability, all 32 bits used Connectors for data and control signaling need to be isolated before withdrawal or insertion OE OE OE OE of the hard disk. PCI Card CBT Bus Switches ASIC The requirements of an ATA RAID sys-

Cross-Reference tem are such that the hard disk can be inserted or withdrawn from the bus or connector. To meet these needs, the CBT bus switch can provide the isolation by switching off during hot plugging through the use of the output enable (OE) pin.

Packaging ASIC ATA/EIDE Bus ATA/EIDE

OE Resources

www.ti.com/signalswitches 12 Texas Instruments Digital Bus Switch Selection Guide Applications (Continued)

Multiplexing USB Peripherals Introduction

CB3Q3125

A B USB D+ Controller Decision Tree 2.0 USB-B D– A B

A B Technical Overview Technical USB MINI-B A B Applications

Ethernet Multiplexing 16-Bit 1-of-2 FET This example is fairly common in telecom Multiplexer/Demultiplexer applications. Basically, two 16-bit/channel SN74CBT16232

Ethernet buses are being MUXed and SN74CBT16390 Selection Guide deMUXed to one commonly shared 16-Bit/Channel Bus Ethernet bus. Ethernet Bus 2 16-Bit/Channel Bus Ethernet Bus 1 16-Bit/Channel Bus Ethernet Bus 3 Cross-Reference

Output Enable Select Packaging Resources

Texas Instruments Digital Bus Switch Selection Guide 13 www.ti.com/signalswitches Applications (Continued)

PCI Hot Plug With Precharge the bus signal to GND, creating a possible This method will ensure that any glitch Introduction Bus switches provide a safe and effec- glitch on the active bus. This glitching produced by insertion (or removal) of the tive method of making older-technology effect can be reduced by using a bus card will not cross the input threshold devices capable of hot-plug insertion. switch with precharged outputs at the region of the receivers on the active bus, During insertion (or removal) of a card connector interface and setting the minimizing the effects of live-insertion into (or from) an active bus, the card’s precharged bias voltage (VBIAS) of the noise. Also, the CBTK and CBT-C products output voltage is close to GND. When bus switch equal to the input threshold include undershoot protection that pro- the connector pins make contact, the voltage level of the receivers on the vides additional protection during hot- active bus. plug insertion.

Decision Tree card’s parasitic capacitance tries to force

VBIAS VBIAS

’6800 Bus Switch* ’6800 Bus Switch*

A1B1 A1 B1

Technical Overview Technical PCI-Bus Bridge Chip PCI C Slot 1 A10B10 A10 B10 PCI Slot 2 Applications

*SN74CBT6800A SN74CBT6800C Hot- Plug SN74CBTK6800 Controller SN74CBT16800 SN74CBT16800C Selection Guide

Notebook Docking Station Bus switches are often used for docking notebook computers into their docking station. Here, the CBTD16210 is optimized Memory for this application with flow-through pinouts and dual 10-bit bus switches Cross-Reference with separate enable inputs, which can be used as two 10-bit switches or on a 20-bit switch. The CBTD16210 provides Docking GMCH ICH4 Bus 5-V to 3.3-V bidirectional level shifting for Switch* Station applications where the 5-V docking station

chipset needs to interface with the Microprocessor

Packaging lower-voltage 3.3-V notebook chipset. *SN74CBTD16210 (5 V to 3.3 V) The CBTK32245 and CBT34X245 may SN74CBTK32245 (5 V) SN74CBT34X245 (5 V) be used for 5-V systems not requiring SN74CBTLV16210 (3.3 V) translation, and the CBTLV16210 for pure 3.3-V systems. Resources

www.ti.com/signalswitches 14 Texas Instruments Digital Bus Switch Selection Guide Selection Guide

CBTLV Introduction TI Package Designator Code Device SOT-23 SC-70 SM-8 US-8 SOIC SSOP TSSOP TVSOP QFN BGA Description Single FET Bus Switch SN74CBTLV1G125 DBV DCK Single FET Bus Switch Standard Bus Switch SN74CBTLV3125 D DBQ PW DGV RGY Quadruple FET Bus Switch SN74CBTLV3126 D DBQ PW DGV RGY Quadruple FET Bus Switch

SN74CBTLV3245A DW DBQ PW DGV RGY Octal FET Bus Switch Decision Tree SN74CBTLV3384 DW DBQ PW DGV 10-Bit FET Bus Switch SN74CBTLV3857 DW DBQ PW DGV 10-Bit FET Bus Switch with Internal Pulldown Resistors SN74CBTLV3861 DW DBQ PW DGV 10-Bit FET Bus Switch SN74CBTLV16210 DL DGG DGV 20-Bit FET Bus Switch SN74CBTLV16800 DL DGG DGV 20-Bit FET Bus Switch with Precharged Outputs SN74CBTLV16211 DL DGG DGV 24-Bit FET Bus Switch Bus Exchange SN74CBTLV3383 DW DBQ PW DGV 10-Bit FET Bus-Exchange Switch

SN74CBTLV16212 DL DGG 24-Bit FET Bus-Exchange Switch Overview Technical MUX/DeMUX SN74CBTLV3257 D DBQ PW DGV RGY 4-Bit 1-to-2 FET Multiplexer/Demultiplexer SN74CBTLV3253 D DBQ PW DGV RGY Dual 1-to-4 FET Multiplexer/Demultiplexer SN74CBTLV3251 D DBQ PW DGV RGY 1-to-8 FET Multiplexer/Demultiplexer SN74CBTLV16292 DL DGG DGV 12-Bit 1-to-2 FET Multiplexer/Demultiplexer with Internal Pulldown Resistors SN74CBTLVR16292 DL DGG DGV 12-Bit 1-to-2 FET Multiplexer/Demultiplexer with Internal Pulldown Resistors and Series Resistors Applications

CB3Q TI Package Designator Code Device SOT-23 SC-70 SM-8 US-8 SOIC SSOP TSSOP TVSOP QFN BGA Description Standard Bus Switch SN74CB3Q3305 PW Dual FET Bus Switch SN74CB3Q3306A DCU PW Dual FET Bus Switch SN74CB3Q3125 DBQ PW DGV RGY Quadruple FET Bus Switch Selection Guide SN74CB3Q3244 DW DBQ/DB PW DGV RGY GQN/ZQN Octal FET Bus Switch SN74CB3Q3245 DBQ PW DGV RGY GQN Octal FET Bus Switch SN74CB3Q3345 DBQ PW DGV RGY 8-Bit FET Bus Switch SN74CB3Q3384 DBQ PW DGV 10-Bit FET Bus Switch SN74CB3Q6800 DBQ PW DGV 10-Bit FET Bus Switch with Precharged Outputs SN74CB3Q16244 DL DGG DGV 16-Bit FET Bus Switch SN74CB3Q16210 DL DGG DGV 20-Bit FET Bus Switch SN74CB3Q16211 DL1 DGG1 DGV1 24-Bit FET Bus Switch Cross-Reference SN74CB3Q16811 DL1 DGG1 DGV1 24-Bit FET Bus Switch with Precharged Outputs SN74CB3Q322452 32-Bit FET Bus Switch Bus Exchange SN74CB3Q33832 10-Bit FET Bus-Exchange Switch SN74CB3Q162122 24-Bit FET Bus-Exchange Switch MUX/DeMUX Packaging SN74CB3Q3257 DBQ PW DGV RGY 4-Bit 1-to-2 FET Multiplexer/Demultiplexer SN74CB3Q3251 DBQ PW DGV RGY1 1-to-8 FET Multiplexer/Demultiplexer SN74CB3Q3253 DBQ PW DGV RGY Dual 1-to-4 FET Multiplexer/Demultiplexer SN74CB3Q162922 12-Bit 1-to-2 FET Multiplexer/Demultiplexer with Internal Pulldown Resistors SN74CB3Q162332 16-Bit 1-to-2 FET Multiplexer/Demultiplexer 1Preview status. 2Planned. Resources

Texas Instruments Digital Bus Switch Selection Guide 15 www.ti.com/signalswitches Selection Guide (Continued)

CB3T Introduction TI Package Designator Code Device SOT-23 SC-70 SM-8 US-8 SOIC SSOP TSSOP TVSOP QFN BGA Description Single FET Bus Switch SN74CB3T1G125 DBV DCK Single 1-Bit FET Bus Switch Standard Bus Switch SN74CB3T3306 DCT DCU Dual FET Bus Switch SN74CB3T3125 PW DGV 4-Bit FET Bus Switch SN74CB3T3245 DBQ PW DGV 8-Bit FET Bus Switch Decision Tree SN74CB3T3384 DBQ PW DGV 10-Bit FET Bus Switch SN74CB3T16210 DL1 DGG1 DGV1 20-Bit FET Bus Switch SN74CB3T16211 DL DGG DGV ZQL 24-Bit FET Bus Switch Bus Exchange SN74CB3T3383 DW DBQ PW DGV 10-Bit FET Bus-Exchange Switch SN74CB3T162122 20-Bit FET Bus-Exchange Switch MUX/DeMUX SN74CB3T3253 D DBQ PW DGV Dual 1-to-4 FET Multiplexer/Demultiplexer

Technical Overview Technical SN74CB3T3257 PW DGV 4-Bit 1-to-2 FET Multiplexer/Demultiplexer 1Preview status. 2Planned.

CBT TI Package Designator Code Device SOT-23 SC-70 SM-8 US-8 SOIC SSOP TSSOP TVSOP QFN BGA Description Applications Single FET Bus Switch SN74CBT1G125 DBV DCK Single FET Bus Switch SN74CBTD1G125 DBV DCK Single FET Bus Switch with Level Shifting SN74CBT1G384 DBV DCK Single FET Bus Switch SN74CBTD1G384 DBV DCK Single FET Bus Switch with Level Shifting Standard Bus Switch SN74CBT3306 D PW Dual FET Bus Switch SN74CBTD3306 D PW Dual FET Bus Switch with Level Shifting

Selection Guide SN74CBTS3306 D PW Dual FET Bus Switch with Schottky Diode Clamping SN74CBT3125 D DBQ/DB PW DGV RGY Quadruple FET Bus Switch SN74CBT3126 D DBQ/DB PW DGV RGY Quadruple FET Bus Switch SN74CBT3244 DW DBQ/DB PW DGV RGY GQN/ZQN Octal FET Bus Switch SN74CBT3245A DW DBQ/DB PW DGV RGY GQN/ZQN Octal FET Bus Switch SN74CBT3345 DW DBQ/DB PW DGV 8-Bit FET Bus Switch SN74CBT3384A DW DBQ/DB PW DGV 10-Bit FET Bus Switch SN74CBTD3384 DW DBQ/DB PW DGV 10-Bit FET Bus Switch with Level Shifting

Cross-Reference SN74CBTS3384 DW DBQ/DB PW DGV 10-Bit FET Bus Switch with Schottky Diode Clamping SN74CBT3861 DW DBQ PW DGV 10-Bit FET Bus Switch SN74CBTD3861 DW DBQ/DB PW DGV 10-Bit FET Bus Switch with Level Shifting SN74CBT6800A DW DBQ/DB PW DGV 10-Bit FET Bus Switch with Precharged Outputs SN74CBTK6800 DW DBQ PW DGV 10-Bit FET Bus Switch with Precharged Outputs and Active-Clamp Undershoot Circuit SN74CBTS6800 DW DBQ/DB PW DGV 10-Bit FET Bus Switch with Precharged Outputs and Schottky Packaging Diode Clamping SN74CBT16244 DL DGG DGV 16-Bit FET Bus Switch SN74CBT16245 DL DGG DGV 16-Bit FET Bus Switch SN74CBTK16245 DL DGG DGV 16-Bit FET Bus Switch with Active-Clamp Undershoot Protection Circuit SN74CBT16210 DL DGG DGV GQL1 20-Bit FET Bus Switch SN74CBTD16210 DL DGG DGV 20-Bit FET Bus Switch with Level Shifting SN74CBT16861 DL DGG DGV GQL1 20-Bit FET Bus Switch 1Preview status. Resources

www.ti.com/signalswitches 16 Texas Instruments Digital Bus Switch Selection Guide Selection Guide (Continued)

CBT (Continued) Introduction TI Package Designator Code Device SOT-23 SC-70 SM-8 US-8 SOIC SSOP TSSOP TVSOP QFN BGA Description Standard Bus Switch (Continued) SN74CBTR16861 DL DGG DGV 20-Bit FET Bus Switch SN74CBT16211A DL DGG DGV GQL/ZQL 24-Bit FET Bus Switch SN74CBTD16211 DL DGG DGV 24-Bit FET Bus Switch with Level Shifting SN74CBTH16211 DL DGG DGV 24-Bit FET Bus Switch with Bus Hold SN74CBTS16211 DL DGG DGV 24-Bit FET Bus Switch with Schottky Diode Clamping Decision Tree SN74CBT32245 GKE/ZKE 32-Bit FET Bus Switch SN74CBTK32245 GKE/ZKE 32-Bit FET Bus Switch with Active Clamp Undershoot Circuit SN74CBT34X245 DBB2 32-Bit FET Bus Switch Bus Exchange SN74CBT3383 DW DBQ/DB PW DGV 10-Bit FET Bus-Exchange Switches SN74CBT16209A DL DGG DGV 18-Bit FET Bus-Exchange Switches SN74CBT16212A DL DGG DGV GQL/ZQL 24-Bit FET Bus-Exchange Switch SN74CBTS16212 24-Bit FET Bus-Exchange Switch with Schottky Diode Clamping

SN74CBT16213 DL DGG 24-Bit FET Bus-Exchange Switch Overview Technical MUX/DeMUX SN74CBT3251 D DBQ/DB PW RGY 1-to-8 FET Multiplexer/Demultiplexer SN74CBT3253 D DBQ/DB PW RGY Dual 1-to-4 FET Multiplexer/Demultiplexer SN74CBT3257 D DBQ/DB PW RGY 4-Bit 1-to-2 FET Multiplexer/Demultiplexer SN74CBT16214 DL DGG 12-Bit 1-to-3 FET Multiplexer/Demultiplexer SN74CBT16232 DL DGG Synchronous 16-Bit 1-to-2 FET Multiplexer/Demultiplexer SN74CBT16233 DL DGG DGV 16-Bit 1-to-2 FET Multiplexer/Demultiplexer Applications SN74CBT16292 DL DGG DGV 12-Bit 1-to-2 FET Multiplexer/Demultiplexer with Internal Pulldown Resistors SN74CBT162292 DL DGG DGV 12-Bit 1-to-2 FET Multiplexer/Demultiplexer with Internal Pulldown Resistors SN74CBT16390 DL DGG DGV 16-Bit to 32-Bit FET Multiplexer/Demultiplexer Bus Switch 2Planned. Selection Guide Cross-Reference Packaging Resources

Texas Instruments Digital Bus Switch Selection Guide 17 www.ti.com/signalswitches Selection Guide (Continued)

CBT-C Introduction TI Package Designator Code Device SOT-23 SC-70 SM-8 US-8 SOIC SSOP TSSOP TVSOP QFN BGA Description Standard Bus Switch SN74CBT3305C D PW Dual FET Bus Switch SN74CBTD3305C1 D PW Dual FET Bus Switch with Level-Shifting Diode SN74CBT3306C D PW Dual FET Bus Switch SN74CBTD3306C1 D PW Dual FET Bus Switch with Level-Shifting Diode SN74CBT3125C D DBQ/DB PW DGV RGY Quadruple FET Bus Switch Decision Tree SN74CBT3244C DW DBQ/DB PW DGV RGY Octal FET Bus Switch SN74CBT3245C DW DBQ/DB PW DGV RGY Octal FET Bus Switch SN74CBT3345C DW DBQ/DB PW DGV RGY 8-Bit FET Bus Switch SN74CBT3384C DW DBQ/DB PW DGV 10-Bit FET Bus Switch SN74CBTD3384C1 DW DBQ/DB PW DGV 10-Bit FET Bus Switch with Level-Shifting Diode SN74CBT6800C DW DBQ/DB PW DGV 10-Bit FET Bus Switch with Precharged Outputs SN74CBT6845C DW DBQ/DB PW DGV RGY 8-Bit FET 5-V Bus Switch With Precharged Outputs SN74CBT16244C DL DGG DGV 16-Bit FET Bus Switch

Technical Overview Technical SN74CBT16245C DL DGG DGV 16-Bit FET Bus Switch SN74CBT16210C DL DGG DGV 20-Bit FET Bus Switch SN74CBT16211C DL DGG DGV 24-Bit FET Bus Switch SN74CBT16800C DL DGG DGV 20-Bit FET Bus Switch with Precharged Outputs SN74CBT16811C DL DGG DGV 24-Bit FET Bus Switch with Precharged Outputs SN74CBT34X245C2 32-Bit FET Bus Switch Bus Exchange

Applications SN74CBT3383C2 10-Bit FET Bus-Exchange Switch SN74CBT16212C DL DGG DGV 24-Bit FET Bus-Exchange Switch MUX/DeMUX SN74CBT3253C D DBQ/DB PW RGY Dual 1-to-4 FET Multiplexer/Demultiplexer SN74CBT3257C D DBQ/DB PW RGY 4-Bit 1-to-2 FET Multiplexer/Demultiplexer SN74CBT16214C DL DGG 12-Bit 1-to-3 FET Multiplexer/Demultiplexer SN74CBT16292C2 12-Bit 1-to-2 FET Multiplexer/Demultiplexer with Internal Pulldown Resistors SN74CBT162332 16-Bit 1-to-2 FET Multiplexer/Demultiplexer 1 Selection Guide For new designs TI recommends the CB3T equivalent. 2Planned. Cross-Reference Packaging Resources

www.ti.com/signalswitches 18 Texas Instruments Digital Bus Switch Selection Guide Digital Bus Switch Cross-Reference

CBTLV Introduction TI IDT Pericom Functional Description 2-Port Switch SN74CBTLV1G125 — — Low-Voltage Single FET Bus Switch SN74CBTLV3125/R IDT74CBTLV3125 PI3B3125 Low-Voltage Quadruple FET Bus Switch SN74CBTLV3126 IDT74CBTLV3126 PI3B3126 Low-Voltage Quadruple FET Bus Switch SN74CBTLV3245A IDT74CBTLV3245 PI3B3245 Low-Voltage Octal FET Bus Switch SN74CBTLV3384 IDT74CBTLV3384 PI3B3384 Low-Voltage 10-Bit FET Bus Switch

SN74CBTLV3857 — — Low-Voltage 10-Bit FET Bus Switch With Internal Pulldown Resistors Decision Tree SN74CBTLV3861 IDT74CBTLV3861 PI3B3861 Low-Voltage 10-Bit FET Bus Switch SN74CBTLV16210 IDT74CBTLV16210 PI3B16210 Low-Voltage 20-Bit FET Bus Switch SN74CBTLV16800 IDT74CBTLV16800 PI3B16215 Low-Voltage 20-Bit FET Bus Switch With Precharged Outputs SN74CBTLV16211 IDT74CBTLV16211 PI3B16211 Low-Voltage 24-Bit FET Bus Switch MUX/DeMUX SN74CBTLV3251 IDT74CBTLV3251 PI3B3251 Low-Voltage 1-of-8 FET Multiplexer/Demultiplexer SN74CBTLV3253 IDT74CBTLV3253 PI3B3253 Low-Voltage Dual 1-of-4 FET Multiplexer/Demultiplexer SN74CBTLV3257 IDT74CBTLV3257 PI3B3257 Low-Voltage 4-Bit 1-of-2 FET Multiplexer/Demultiplexer Technical Overview Technical SN74CBTLV16292 IDT74CBTLV16292 PI3B16292 Low-Voltage 12-Bit 1-of-2 FET Multiplexer/Demultiplexer With Internal Pulldown Resistors SN74CBTLVR16292 IDT74CBTLVR16292 — Low-Voltage 12-Bit 1-of-2 FET Multiplexer/Demultiplexer With Internal Pulldown Resistors and Series Damping Resistors Bus-Exchange Switch SN74CBTLV3383 IDT74CBTLV3383 PI3B3383 Low-Voltage 10-Bit FET Bus-Exchange Switch SN74CBTLV16212 IDT74CBTLV16212 PI3B16212 Low-Voltage 24-Bit FET Bus-Exchange Switch

CB3Q Applications TI IDT Functional Description 2-Port Switch SN74CB3Q3305 — 2-Bit FET Bus Switch With Individual High Enables SN74CB3Q3306 — Dual FET Bus Switch SN74CB3Q3125 IDTQS3VH125 Quadruple FET Bus Switch SN74CB3Q3244 IDTQS3VH244 Octal FET Bus Switch SN74CB3Q3245 IDTQS3VH245 Octal FET Bus Switch SN74CB3Q3345 — 8-Bit FET Bus Switch Selection Guide SN74CB3Q3384 IDTQS3VH384 10-Bit FET Bus Switch SN74CB3Q6800 IDTQS3VH800 10-Bit FET Bus Switch With Precharged Outputs SN74CB3Q16244 IDTQS3VH16244 16-Bit FET Bus Switch SN74CB3Q16210 IDTQS3VH16210 20-Bit FET Bus Switch SN74CB3Q16211 IDTQS3VH16211 24-Bit FET Bus Switch SN74CB3Q16811 — 24-Bit FET Bus Switch With Precharged Outputs

MUX/DeMUX Cross-Reference SN74CB3Q3251 IDTQS3VH251 1-to-8 FET Multiplexer/Demultiplexer SN74CB3Q3253 IDTQS3VH253 Dual 1-of-4 FET Multiplexer/Demultiplexer SN74CB3Q3257 IDTQS3VH257 4-Bit 1-of-2 FET Multiplexer/Demultiplexer SN74CB3Q16292 — 12-Bit 1-of-2 FET Multiplexer/Demultiplexer With Internal Pulldown Resistors SN74CB3Q16233 IDTQS3VH16233 16-Bit 1-of-2 FET Multiplexer/Demultiplexer Bus-Exchange Switch SN74CB3Q3383 IDTQS3VH383 10-Bit FET Bus-Exchange Switches Packaging SN74CB3Q16212 IDTQS3VH16212 24-Bit FET Bus-Exchange Switch Resources

Texas Instruments Digital Bus Switch Selection Guide 19 www.ti.com/signalswitches Digital Bus Switch Cross-Reference (Continued)

CB3T Introduction TI1 Functional Description 2-Port Switch SN74CB3T1G125 Single 1-Bit FET Bus Switch SN74CB3T3306 Dual FET Bus Switch SN74CB3T3125 4-Bit FET Bus Switch SN74CB3T3245 8-Bit FET Bus Switch SN74CB3T3384 10-Bit FET Bus Switch

Decision Tree SN74CB3T16210 20-Bit FET Bus Switch SN74CB3T16211 24-Bit FET Bus Switch MUX/DeMUX SN74CB3T3253 Dual 1-of-4 FET Multiplexer/Demultiplexer SN74CB3T3257 4-Bit 1-of-2 FET Multiplexer/Demultiplexer Bus-Exchange Switch SN74CB3T3383 10-Bit FET Bus-Exchange Switch SN74CB3T16212 20-Bit FET Bus-Exchange Switch 1No direct cross-references available for the TI CB3T Bus Switch Family Technical Overview Technical CBT TI IDT Pericom Fairchild Functional Description 2-Port Switch SN74CBT1G125 — PI5C3302 & PI5A125 — Single FET Bus Switch SN74CBT1G384 — PI5C3301 NC7SZ384 Single FET Bus Switch Applications SN74CBTD1G125 — — — Single FET Bus Switch With Level Shifting SN74CBTD1G384 — — NC7SZD384 Single FET Bus Switch With Level Shifting SN74CBT3306 — PI5C3306 FST3306 Dual FET Bus Switch SN74CBTD3306 — — FSTD3306 Dual FET Bus Switch With Level Shifting SN74CBTS3306 — — — Dual FET Bus Switch With Schottky Diode Clamping SN74CBT3125 QS3125 PI5C3125 FST3125 Quadruple FET Bus Switch SN74CBT3126 QS3126 PI5C3126 FST3126 Quadruple FET Bus Switch SN74CBT3244 QS3244 PI5C3244 FST3244 Octal FET Bus Switch Selection Guide SN74CBT3245A QS3245 PI5C3245 FST3245 Octal FET Bus Switch SN74CBT3345 — — FST3345 8-Bit FET Bus Switch SN74CBT3384A QS3384 PI5C3384 & PI5C3384A FST3384 10-Bit FET Bus Switch SN74CBTD3384 — — — 10-Bit FET Bus Switches With Level Shifting SN74CBTS3384 — — — 10-Bit FET Bus Switch With Schottky Diode Clamping SN74CBT3861 QS3861 — — 10-Bit FET Bus Switch SN74CBTD3861 — — — 10-Bit FET Bus Switch With Level Shifting

Cross-Reference SN74CBT6800A 74FST6800 PI5C6800 FST6800 10-Bit FET Bus Switch With Precharged Outputs SN74CBTK6800 — PI5C6800C FSTU6800 10-Bit FET Bus Switch With Precharged Outputs and Active-Clamp Undershoot Circuit SN74CBTS6800 — — — 10-Bit FET Bus Switch With Precharged Outputs and Schottky Diode Clamping SN74CBT16244 74FST163244 PI5C16244 FST16244 16-Bit FET Bus Switch SN74CBT16245 IDTQS316245 PI5C16245 FST16245 16-Bit FET Bus Switch SN74CBTK16245 — — — 16-Bit FET Bus Switch With Active-Clamp Undershoot Protection Circuit SN74CBT16210 — PI5C16210 FST16210 20-Bit FET Bus Switch

Packaging SN74CBTD16210 — — — 20-Bit FET Bus Switch With Level Shifting SN74CBT16861 QS32X861 PI5C16861 FST16861 20-Bit FET Bus Switch SN74CBTR16861 74FST1632861 — FST162861 20-Bit FET Bus Switch SN74CBT16211A 74FST163211 & QS316211 PI5C16211 FST16211 24-Bit FET Bus Switch SN74CBTD16211 — — FSTD16211 24-Bit FET Bus Switch With Level Shifting SN74CBTH16211 — — — 24-Bit FET Bus Switch With Bus Hold SN74CBTS16211 — — — 24-Bit FET Bus Switch With Schottky Diode Clamping

Resources SN74CBT32245 — — — 32-Bit FET Bus Switch

www.ti.com/signalswitches 20 Texas Instruments Digital Bus Switch Selection Guide Digital Bus Switch Cross-Reference (Continued)

CBT (Continued) Introduction TI IDT Pericom Fairchild Functional Description 2-Port Switch (Continued) SN74CBTK32245 — — — 32-Bit FET Bus Switch With Active Clamp Undershoot Circuit SN74CBT34X245 QS34X245 PI5C34X245 FST34X245 32-Bit FET Bus Switch Bus-Exchange Switch SN74CBT3383 QS3383 PI5C3383 FST3383 10-Bit FET Bus-Exchange Switches SN74CBT16209A — PI5C16209 FST16209 18-Bit FET Bus-Exchange Switches

SN74CBT16212A QS316212 PI5C16212 FST16212 24-Bit FET Bus-Exchange Switch Decision Tree SN74CBTS16212 — — — 24-Bit FET Bus-Exchange Switch With Schottky Diode Clamping SN74CBT16213 QS316212 PI5C16213 FST16213 24-Bit FET Bus-Exchange Switch MUX/DeMUX SN74CBT3251 QS3251 PI5C3251 — 1-of-8 FET Multiplexer/Demultiplexer SN74CBT3253 QS3253 PI5C3253 FST3253 Dual 1-of-4 FET Multiplexer/Demultiplexer SN74CBT3257 QS3257 PI5C3257 FST3257 4-Bit 1-of-2 FET Multiplexer/Demultiplexer SN74CBT16292 — PI5C16292 FST16292 12-Bit 1-of-2 FET Multiplexer/Demultiplexer With Internal Pulldown Resistors SN74CBT162292 — — — 12-Bit 1-to-2 FET Multiplexer/Demultiplexer With Internal Pulldown Resistors Technical Overview Technical SN74CBT16214 74FST163214 PI5C16214 — 12-Bit 1-of-3 FET Multiplexer/Demultiplexer SN74CBT16232 74FST163212 — FST16232 Synchronous 16-Bit 1-of-2 FET Multiplexer/Demultiplexer SN74CBT16233 74FST163233 — FST16233 16-Bit 1-of-2 FET Multiplexer/Demultiplexer SN74CBT16390 — — — 16-Bit to 32-Bit FET Multiplexer/Demultiplexer Bus Switch CBT-C Applications TI Pericom Fairchild Functional Description 2-Port Switch SN74CBT3305C — — Dual FET Bus Switch With –2-V Undershoot Protection SN74CBTD3305C — — Dual FET Bus Switch With Level Shifting Diode With –2-V Undershoot Protection SN74CBT3306C PI5C3306C — Dual FET Bus Switch With –2-V Undershoot Protection SN74CBTD3306C — — Dual FET Bus Switch With Level Shifting Diode With –2-V Undershoot Protection SN74CBT3125C PI5C3125C FSTU3125 Quadruple FET Bus Switch With –2-V Undershoot Protection SN74CBT3244C — — Octal FET Bus Switch With –2-V Undershoot Protection SN74CBT3245C — — Octal FET Bus Switch With –2-V Undershoot Protection Selection Guide SN74CBT3345C — — 8-Bit FET Bus Switch With –2-V Undershoot Protection SN74CBT6845C — — Octal FET Bus Switch With Precharged Outputs and –2-V Undershoot Protection SN74CBT3384C PI5C3384C FSTU3384 10-Bit FET Bus Switch With –2-V Undershoot Protection SN74CBTD3384C — — 10-Bit FET Bus Switch With Level Shifting Diode and –2-V Undershoot Protection SN74CBT6800C PI5C6800C FSTU6800 10-Bit FET Bus Switch With Precharged Outputs With –2-V Undershoot Protection SN74CBT16244C — — 16-Bit FET Bus Switch With –2-V Undershoot Protection

SN74CBT16210C — — 20-Bit FET Bus Switch With –2-V Undershoot Protection Cross-Reference SN74CBT16211C — FSTU16211 24-Bit FET Bus Switch With –2-V Undershoot Protection SN74CBT16811C — — 24-Bit FET Bus Switch With Precharged Outputs With –2-V Undershoot Protection MUX/DeMUX SN74CBT3253C PI5C3253C FSTU3253 Dual 1-of-4 FET Multiplexer/Demultiplexer With –2-V Undershoot Protection SN74CBT3257C PI5C3257C FSTU3257 4-Bit 1-of-2 FET Multiplexer/Demultiplexer With –2-V Undershoot Protection SN74CBT16292C — — 12-Bit 1-of-2 FET Multiplexer/Demultiplexer With Internal Pulldown Resistors and –2-V Undershoot Protection

SN74CBT16233C PI5C16233C — 16-Bit 1-of-2 FET Multiplexer/Demultiplexer With –2-V Undershoot Protection Packaging Bus-Exchange Switch SN74CBT3383C — — 10-Bit FET Bus-Exchange Switch With –2-V Undershoot Protection SN74CBT16212C — — 24-Bit FET Bus-Exchange Switch With –2-V Undershoot Protection Resources

Texas Instruments Digital Bus Switch Selection Guide 21 www.ti.com/signalswitches Packaging

Introduction 0.037 0.037 (0,95) (0,95) For more TI Logic packaging offerings, visit:

0.057 0.077 logic.ti.com (1,45) (1,95) Dimensions are in inches (millimeters) 5-ball/6-ball 8-ball TM TM NanoStar (YEP) NanoStar (YEP) 0.181 TM TM 0.122 Decision Tree NanoFree (YZP) (4,60) NanoFree (YZP) (3,10) Ball pitch = 0.020 (0,50) Ball pitch = 0.020 (0,50) Height = 0.020 (0,50) Height = 0.020 (0,50) 0.280 Area = 0.002 (1,26) Area = 0.003 (1,85) 0.161 (4,10) (7,10)

0.144 0.118 (3,00) (3,65) 20-ball 56/48-ball VFBGA (GQN) VFBGA (GQL) 0.144 Ball pitch = 0.026 (0,65) Ball pitch = 0.026 (0,65) (3,65) 0.118 (3,00) Height = 0.039 (1,00) Height = 0.039 (1,00)

Technical Overview Technical Area = 0.020 (12,7) Area = 0.051 (32,7) 14-pin 5-pin QFN (RGY) 0.220 SOT-23 (DBV) (5,60) Lead pitch = 0.020 (0,50) Lead pitch = 0.037 (0,95) 0.220 Height = 0.039 (1,00) Height = 0.047 (1,20) (5,60) Area = 0.021 (13,3) Area = 0.014 (9)

0.144 0.085 0.634

Applications (3,65) (2,15) (16,10) 0.544 (13,60) 0.163 0.091 (4,15) (2,30)

16-pin 5-pin 96-ball 114-ball QFN (RGY) SC-70 (DCK) LFBGA (GKE) LFBGA (GKF) Lead pitch = 0.020 (0,50) Lead pitch = 0.026 (0,65) Ball pitch = 0.031 (0,80) Ball pitch = 0.031 (0,80) Height = 0.039 (1,00) Height = 0.037 (0,95) Height = 0.055 (1,40) Height = 0.055 (1,40) Area = 0.023 (15,1) Area = 0.008 (4.95) Area = 0.139 (90,2) Area = 0.139 (90,2) Selection Guide 0.295 0.144 0.197 0.260 (7,50) (3,65) (5,00) (6,60)

0.183 0.252 0.323 0.260 (8,20) (4,65) (6,40) (6,60)

20-pin 20-pin 20-pin 20-pin Cross-Reference QFN (RGY) TVSOP (DGV) TSSOP (PW) SSOP (DB) Lead pitch = 0.020 (0,50) Lead pitch = 0.016 (0,40) Lead pitch = 0.026 (0,65) Lead pitch = 0.026 (0,65) Height = 0.039 (1,00) Height = 0.047 (1,20) Height = 0.047 (1,20) Height = 0.079 (2,0) Area = 0.026 (17,0) Area = 0.050 (32) Area = 0.068 (44) Area = 0.095 (62)

0.630 0.496 (16,00) 0.144 (12,60) (3,65) 0.386 (9,80) Packaging 0.420 0.222 0.260 0.327 (10,67) (5,65) (6,60) (8,30)

24-pin 48-pin WidebusTM 48-pin WidebusTM 48-pin WidebusTM QFN (RHL) TVSOP (DGV) TSSOP (DGG) SSOP (DL) Lead pitch = 0.020 (0,50) Lead pitch = 0.016 (0,40) Lead pitch = 0.020 (0,50) Lead pitch = 0.025 (0,635) Height = 0.039 (1,00) Height = 0.047 (1,20) Height = 0.047 (1,20) Height = 0.110 (2,79) Resources Area = 0.032 (21,0) Area = 0.100 (63) Area = 0.162 (105) Area = 0.265 (171)

www.ti.com/signalswitches 22 Texas Instruments Digital Bus Switch Selection Guide Resources

ON-LINE HELP BUS SWITCH SAMPLE REQUESTS Introduction For information regarding TI’s bus switch portfolio, visit: Working day and night and need a free TI product sample www.ti.com/signalswitches fast? Orders for material in stock received by 7 p.m. CST For additional logic information, including application reports, are shipped before midnight the same day. samples and data sheets, visit: logic.ti.com We’re waiting to take your order on-line 24/7. To access the TI Logic KnowledgeBase and get answers to your technical questions, go to: We’ll help you. That’s what our Product Sample program is all

www.ti.com/sc/lkb about. Helping you place your order for FREE product samples Decision Tree To subscribe to Logic News, a monthly newsletter featuring when you’re ready to place it. new products and other TI logic news, visit: • 10,000 different devices plus package options. www.ti.com/sc/logicnews • No waiting to talk to TI sales or distributors. LITERATURE • Free—including shipping. • Orders for material in stock received by 7 p.m. CST are Data Books ...... Lit. Number shipped before midnight the same day. Signal Switch Data Book ...... SCDD003* • Shipping will be UPS “Next Day” in the U.S. and “Priority 1” Little Logic Data Book ...... SCED010* Overview Technical internationally. Selection Guides/Brochures • Shipping confirmation notice lets you track your order on the Logic Selection Guide ...... SDYU001* UPS Web site. Little Logic Selection Guide ...... SCYT129 • Phone option—if you need help selecting a sample part, call Logic Reference Guide ...... SCYB004* your regional Product Information Center listed on the back Design Considerations for Logic Products,

page or visit Applications Volume 3 ...... SDYA019 support.ti.com Application Notes CBT-C, CB3T, and CB3Q Signal-Switch Families . . .SCDA008* Selecting the Right Texas Instruments Signal Switch ...... SZZA030* Texas Instruments Little Logic ...... SCEA029* To order any TI Logic literature listed, please contact the Texas

Instruments Literature Response Center at 1-800-477-8924 Selection Guide and provide the literature number. *Literature available on the Web by substituting the Lit. Number in the following address: www-s.ti.com/sc/techlit/litnumber Cross-Reference Packaging Resources

Texas Instruments Digital Bus Switch Selection Guide 23 www.ti.com/signalswitches TM Technology for Innovators

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