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U18

NAND Gate

NAND gates are used in digital logic circuits to perform an inverted logical multiply. When one of the

inputs is low (0), the output is high. The output will only be low (0) when both inputs are high.

This circuit demonstrates how the NAND Gate

(U18) works. Connect one end of the red and

black jumper wires to the A & B inputs on U18

and the loose ends to either low voltage

(denoted as a “0”) or high voltage (denoted as a

“1”). If either input A OR input B are low (0,

either green LED is off), then the Q output on

U18 will be high (1), and the red LED (D1) will be

on. The output logic is exactly the opposite of

the AND gate, hence this gate is called the NOT

AND or NAND Gate

Input (A) Input (B) Output (Q)

0 0 1

0 1 1

1 0 1

1 1 0

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

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