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U17

OR Gate

OR gates are used in digital logic circuits to perform a logical add. When one of the inputs is high (1), the

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

This circuit demonstrates how the OR Gate

(U17) works. Connect one end of the red

and black jumper wires to the A & B

inputs on U17 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 high (1, either green LED

is on), then the Q output on U17 will be

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

The output of an OR gate is often

represented as the sum of the inputs, so

Q = A+B.

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

0 0 0

0 1 1

1 0 1

1 1 1

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 16

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Elenco Understanding Logic Gates Manual do Utilizador Página 10