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Universal Gate – NAND Universal Gate – NAND Digital Electronics © 2014 Project Lead The Way, Inc. Universal Gate – NAND This presentation will demonstrate • The basic function of the NAND gate. • How a NAND gate can be used to replace an AND gate, an OR gate, or an INVERTER gate. • How a logic circuit implemented with AOI logic gates can be re-implemented using only NAND gates. • That using a single gate type, in this case NAND, will reduce the number of integrated circuits (IC) required to implement a logic circuit. AOI Logic NAND Logic 2 More ICs = More $$ Less ICs = Less $$ NAND Gate X Z = X Y = X + Y Y X Y Z 0 0 1 0 1 1 1 0 1 1 1 0 3 NAND Gate as an Inverter Gate X • X = X (Before Bubble) X Z = X X Z 0 1 Equivalent to Inverter 1 0 4 NAND Gate as an AND Gate X Y X Z = X Y = X Y Y NAND Gate Inverter X Y Z 0 0 0 0 1 0 Equivalent to AND Gate 1 0 0 1 1 1 5 NAND Gate as an OR Gate X X Y Z = X Y = X + Y = X + Y Y Inverters NAND Gate X Y Z 0 0 0 0 1 1 Equivalent to OR Gate 1 0 1 1 1 1 6 NAND Gate Equivalent to AOI Gates AND OR INVERTER 7 Process for NAND Implementation 1. If starting from a logic expression, implement the design with AOI logic. 2. In the AOI implementation, identify and replace every AND,OR, and INVERTER gate with its NAND equivalent. 3. Redraw the circuit. 4. Identify and eliminate any double inversions (i.e., back- to-back inverters). 5. Redraw the final circuit. 8 NAND Implementation Example: Design a NAND Logic Circuit that is equivalent to the AOI circuit shown below. = B C + A C 9 NAND Implementation Solution – Step 2 Identify and replace every AND,OR, and INVERTER gate with its NAND equivalent. 10 NAND Implementation Solution – Step 3 Redraw the circuit. 11 NAND Implementation Solution – Step 4 Identify and eliminate any double inversions. 12 NAND Implementation Solution – Step 5 Redraw the circuit. 13 Proof of Equivalence C B C = B C A C Z = B C + A C A C Z = B C + A C 14 AOI vs. NAND IC Type Gates Gate / IC # ICs IC Type Gates Gate / IC # ICs 74LS04 1 6 1 74LS00 4 4 1 74LS08 2 4 1 Total Number of ICs → 1 74LS32 1 4 1 Total Number of ICs → 3 15 Universal Gate – NOR This presentation will demonstrate… • The basic function of the NOR gate. • How an NOR gate can be using to replace an AND gate, an OR gate or an INVERTER gate. • How a logic circuit implemented with AOI logic gates could be re-implemented using only NOR gates • That using a single gate type, in this case NOR, will reduce the number of integrated circuits (IC) required to implement a logic circuit. AOI Logic NOR Logic 16 More ICs = More $$ Less ICs = Less $$ NOR Gate X Z = X + Y = X Y Y X Y Z 0 0 1 0 1 0 1 0 0 1 1 0 17 NOR Gate as an Inverter Gate X + X = X (Before Bubble) X Z = X X Z 0 1 Equivalent to Inverter 1 0 18 NOR Gate as an OR Gate X + Y X Z = X + Y = X + Y Y NOR Gate “Inverter” X Y Z 0 0 0 0 1 1 Equivalent to OR Gate 1 0 1 1 1 1 19 NOR Gate as an AND Gate X X Y Z = X + Y = X Y = X Y Y “Inverters” NOR Gate X Y Z 0 0 0 0 1 0 Equivalent to AND Gate 1 0 0 1 1 1 20 NOR Gate Equivalent of AOI Gates AND OR INVERTER 21 NOR/NAND Gate Equivalent to AOI AND OR INVERTER 22 Process for NOR Implementation 1. If starting from a logic expression, implement the design with AOI logic. 2. In the AOI implementation, identify and replace every AND,OR, and INVERTER gate with its NOR equivalent. 3. Redraw the circuit. 4. Identify and eliminate any double inversions. (i.e. back- to-back inverters) 5. Redraw the final circuit. 23 NOR Implementation Example: Design a NOR Logic Circuit that is equivalent to the AOI circuit shown below. = B C + A C 24 NOR Implementation Solution – Step 2 Identify and replace every AND,OR, and INVERTER gate with its NAND equivalent. 25 NOR Implementation Solution – Step 3 Redraw Circuit. 26 NOR Implementation Solution – Step 4 Identify and eliminate any double inversions. 27 NOR Implementation Solution – Step 5 Redraw Circuit. 28 Proof of Equivalence B + C = B C = B C C B = B C + A C C Z = B C + A C B C + A C A A + C = A C = A C 29.
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