1.10 DIGITAL LOGIC - NAND GATE
The NAND gate is a standard AND
gate with the output inverted. If A and B are both logic 1’s, the output at C
is a 0. Under any other combination,
the output is 1. The notation used to express this logic statement is C =
A.B and is read "C equals A AND B NOT".
Function
The
function of a NAND gate is similar to the circuit shown below. If both A and B
have an input, their corresponding relays is energized causing relay K3 to be
energized. This causes the switch above K3 to open resulting in no output at C.
If either A or B or both A and B have no input, relay K3 is closed and there is
an output at C.
Truth Table
The various combinations of
inputs and the resulting outputs for the function circuit are shown.
Timing Diagram
The
timing diagram shows the resulting output at C with inputs at A and B at
different times for the function circuit shown.
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