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NOR Gates

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NOR (i.e., NOT-OR) gates will only produce a logic 1 output when all inputs are simultaneously at logic 0. Any other input combination will produce a logic 0 output. A NOR gate, therefore, is simply an OR gate with its output inverted. The circle shown at the output of the NOR gate symbol denotes this inversion. The Boolean expression for the output, Y, of a NOR 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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