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f-alpha.net » Electronics » Digital Electronics » Boolean Logic » Know more... » Experiment 27 - 4-Input OR Gate

Experiment 27- OR Gate with 4 Inputs

You can easily fill in the truth table of the OR-Logic with 4 inputs A, B, C and D...

A B C D Q
0 0 0 0 0
0 0 0 1 1
0 0 1 0 1
0 0 1 1 1
0 1 0 0 1
0 1 0 1 1
0 1 1 0 1
0 1 1 1 1
1 0 0 0 1
1 0 0 1 1
1 0 1 0 1
1 0 1 1 1
1 1 0 0 1
1 1 0 1 1
1 1 1 0 1
1 1 1 1 1

Truth table of the 4 input OR logic.

Circuit symbol 4 input OR gate.

Circuit 4 input OR logic. (Enlarge)

With one of the two OR gates on a C-MOS IC 4072 you can setup the 4 input OR logic with the circuit shown.

Also, the same laws (associative law and neutral element) apply to the 4 input OR logic...

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