An AND gate is a basic logic gate that checks if all its inputs are HIGH. So the output from a 3-input AND gate will only be HIGH if all three inputs are HIGH. Pin Overview PIN NAME PIN # TYPE DESCRIPTION VDD 14 Power Supply Voltage ( 3 to 15V) GND 7 Power Ground (0V) A1 to A3 1, 3, 13 Input Inputs A of the three AND gates B1 to B3 2, 4, 12 Input Inputs B of the three AND gates C1 to C3 5, 8, 11 Input Inputs C of the three AND gates Q1 to Q3 6, 9, 10 Output Outputs from the three AND gates Pin overview for the 4073 IC What is a 3-input AND gate? An AND gate with three inputs will only give out HIGH if all inputs are HIGH (input 1 AND input 2 AND input 3). You can see the truth table below. 3-input AND gate symbol INPUT A INPUT B INPUT C OUTPUT 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 for the 3-input AND gate How To Use the CD4073? First of all, you need a power supply voltage of 3 to 15V. Some versions of the chip support up to 20V. Check the datasheet of your version of the chip for exact values. To be able to use any of the AND gates in the chip, you need to first connect the VDD pin to the positive supply terminal and the GND pin to the negative supply terminal. The A, B, and C pins are the inputs to the three AND gates in the IC. The Q pins are the outputs from the AND gates. 4073 Datasheet
