Practical Electronics/IC/4002

The 4002 is a member of the 4000 Series CMOS range, and contains two independent NOR 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 NOR gate in general, see this module.

Truth Table for a Single Gate

This chip is widely available, and usually comes in a DIL-14 or SOIC-14 package.

This chip is different in pinout to the TTL 7425, but can fulfill its function if the wiring is modified.