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Advanced Bicmos Technology ABT Logic

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Advanced Bicmos Technology ABT Logic ABT Advanced BiCMOS Technology Characterization Information SCBA008B June 1997 1 IMPORTANT NOTICE Texas Instruments (TI) reserves the right to make changes to its products or to discontinue any semiconductor product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. TI warrants performance of its semiconductor products and related software to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Certain applications using semiconductor products may involve potential risks of death, personal injury, or severe property or environmental damage (“Critical Applications”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED, OR WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. Inclusion of TI products in such applications is understood to be fully at the risk of the customer. Use of TI products in such applications requires the written approval of an appropriate TI officer. Questions concerning potential risk applications should be directed to TI through a local SC sales office. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards should be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or services described herein. Nor does TI warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. Copyright 1997, Texas Instruments Incorporated 2 Contents Title Page Introduction . 1 AC Performance . 1 Power Considerations . 6 Input Characteristics . 7 ABT Input Circuitry . 7 Input Current Loading . 8 Supply Current Change (∆ICC) . 9 Proper Termination of Unused Inputs. 10 Output Characteristics . 10 Output Drive . 11 Partial Power Down . 12 Signal Integrity . 13 Simultaneous-Switching Phenomenon. 13 Simultaneous-Switching Solutions . 15 Advanced Packaging . 17 List of Illustrations Figure Title Page 1 Propagation Delay vs Operating Free-Air Temperature A to Y. 2 2 Propagation Delay vs Number of Outputs Switching. 4 3 Propagation Delay vs Capacitive Load. 5 4 Supply Current vs Frequency . 6 5 Simplified Input Stage of an ABT Circuit. 7 6 Output Voltage vs Input Voltage . 8 7 Input Current vs Input Voltage . 8 8 Supply Current vs Input Voltage . 9 9 Sample Input/Output Model . 10 10 Simplified ABT Output Stage . 11 11 Typical ABT Output Characteristics. 11 12 Reflected Wave Switching . 12 13 Simplified Input Structures for CMOS and ABT Devices. 13 14 Example of Partial System Power Down. 13 15 Simultaneous-Switching Output Model. 13 EPIC-ΙΙB and Widebus are trademarks of Texas Instruments Incorporated. iii List of Illustrations (continued) Figure Title Page 16 Simultaneous-Switching-Noise Waveform. 14 17 TTL DC Noise Margin . 15 18 ABT646A Simultaneous-Switching Waveform. 16 19 ABT16500B Simultaneous-Switching Waveform. 16 20 24-Pin Surface-Mount Comparison. 17 21 Distributed Pinout of ’ABT16244A. 18 Appendixes Title Page Appendix A . 19 SN54ABT646A and SN74ABT646A Characterization Data. 21 Appendix B . 31 SN54ABT16244 and SN74ABT16244A Characterization Data. 33 Appendix C . 41 SN54ABT16500B and SN74ABT16500 Characterization Data. 43 iv Introduction The purpose of this document is to assist the designers of high-performance digital logic systems in using the advanced BiCMOS technology (ABT) logic family. Detailed electrical characteristics of these bus-interface devices are provided and tables and graphs have been included to compare specific parameters of the ABT family with those of other logic families. In addition, typical data is provided to give the hardware designer a better understanding of how the ABT devices operate under various conditions. The major subject areas covered in the report are as follows: • AC Performance • Power Considerations • Input Characteristics • Output Characteristics • Signal Integrity • Advanced Packaging • Characterization Information The characterization information provided is typical data and is not intended to be used as minimum or maximum specifications, unless noted as such. For more information on these or other TI products, please contact your local TI representative, authorized distributor, the TI technical support hotline at 972-644-5580, or visit the TI logic home page at http://www.ti.com/sc/logic. For a complete listing of all TI logic products, please order our logic CD-ROM (literature number SCBC001) or Logic Selection Guide (literature number SDYU001) by calling our literature response center at 1-800-477-8924. AC Performance As microprocessor operating frequencies increase, the period of time allotted for operations, such as memory access or arithmetic functions, decreases. With this in mind, TI developed a family of bus-interface devices – ABT – utilizing advanced BiCMOS technology. The goal of the ABT family of devices is to give system designers one bus-interface solution that provides high drive capability, good signal integrity, and propagation delays short enough to appear transparent with respect to.
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