Experiment 27- OR Gate with 4 Inputs

In the OR logic you can also combine 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...