PHYS345 Electricity and Electronics

AND Gate

[Schematic of AND gate]

The truth table for the NAND gate is commonly written in one of the two forms below, where the true state T is represented by 1 and the false state F is represented by 0.

A: B: C:       A: B: C:
(in) (in) (out)   (in) (in) (out)
F F F   0 0 0
F T F   0 1 0
T F F   1 0 0
T T T   1 1 1

The AND operation has the usual logical significance -- the outcome is true if, and only if, both inputs are true. The symbol for AND looks like the "dot" representing the usual multiplication of two numbers; note that the truth table looks correct for multiplication of "0"s and "1"s.

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Last updated Oct. 27, 1998.
Copyright George Watson, Univ. of Delaware, 1998.