94Chapter 4Gates and CircuitsFigure 4.5Various representations of a NAND gateLogic Diagram SymbolBoolean ExpressionTruth Table1 0 .– 6 7)2AABXB00110101X1110Figure 4.6Various representations of a NOR gateLogic Diagram SymbolBoolean ExpressionTruth Table1 0 .– 8 7)2AB00110101X1000ABXNAND and NOR GatesThe NAND gate is shown in Figure 4.5 and the NOR gate is shown inFigure 4.6. They each accept two input values. The NAND and NOR gatesare essentially the opposite of the AND and OR gates, respectively. Thatis, the output of a NAND gate is the same as if you took the output of anAND gate and put it through an inverter (a NOT gate).
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