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Before reading this page
read the one on LOGIC
GATES.
The Nand gate has two or
more inputs and one
output.
The output voltage goes
low only when all input
voltages are high.
In
the switch diagram the
lamp goes out when A
and
B are operated. (A short
circuit is placed across
the lamp)
In
the truth table Z = 0
when A
and
B = 1
_
The Boolean expression
is A.B = Z which
translated says, A
and
B high makes Z low.
_
Z (called Z bar) means
Z is low.
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US symbol |
UK symbol |
switches
simulating NAND |
truth table |
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