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NAND Gates

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NAND (i.e., NOT-AND) gates will only produce a logic 0 output when all inputs are simultaneously at logic 1. Any other input combination will produce a logic 1 output. A NAND gate, therefore, is nothing more than an AND gate with its output inverted! The circle shown at the output of the NAND gate symbol denotes this inversion. The Boolean expression for the output, Y, of a NAND gate with inputs, A and B, is:

Y =

Logic 0, Logic 0 Logic 0, Logic 1 Logic 1, Logic 0 Logic 1, Logic 1

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