Dale - Computer Science Illuminated 121

Dale - Computer Science Illuminated 121 - 94 Chapter 4...

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94 Chapter 4 Gates and Circuits Figure 4.5 Various representations of a NAND gate Logic Diagram Symbol Boolean Expression Truth Table 1 0 .– 6 7)2 A A B X B 0 0 1 1 0 1 0 1 X 1 1 1 0 Figure 4.6 Various representations of a NOR gate Logic Diagram Symbol Boolean Expression Truth Table 1 0 .– 8 7)2 AB 0 0 1 1 0 1 0 1 X 1 0 0 0 A B X NAND and NOR Gates The NAND gate is shown in Figure 4.5 and the NOR gate is shown in Figure 4.6. They each accept two input values. The NAND and NOR gates are essentially the opposite of the AND and OR gates, respectively. That is, the output of a NAND gate is the same as if you took the output of an AND gate and put it through an inverter (a NOT gate).
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