Experiment 20 - The 3-Input AND Gate

With the AND logic you can also combine 3 inputs. For this you can use AND gates which already contain 3 inputs...

You can easily fill up the truth table of the 3 input AND logic with the inputs A, B und C...

A B C Q 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0 0 1 0 1 0 1 1 0 0 1 1 1 1 Truth Table of the 3-input AND logic.

Circuit symbol 3-input AND gate.

Circuit 3-input AND logic. (Enlarge)

With one of the three AND gates on the C-MOS IC 4073 you can set up the 3-input AND logic with the circuit shown.