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Practical Electronics/IC/4072
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4072 Combinatorial Logic Dual 4-Input OR Gate 14
The 4072 is a member of the 4000 Series CMOS range, and contains two independent OR gates, each with four inputs. The pinout diagram, given on the right, is the standard four-input CMOS logic gate IC layout:
Pin 7 is the ground supply (GND)
Pin 14 is the positive supply (VDD)
Pins 2-5 and 9-12 are gate inputs for the two gates
Pin 1 and 13 are gate outputs
Pin 6 and 8 are not connected
The truth table for one of the two gates is shown below. For more information about the OR gate in general, see this module.
Truth Table for a Single Gate
A B C D Q 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
This chip is widely available, and usually comes in a DIL-14 or SOIC-14 package.