The 4001 is a member of the 4000 Series CMOS range, and contains four independent NOR gates, each with two inputs. The pinout diagram, given on the right, is the standard two-input CMOS logic gate IC layout:
Pin 7 is the negative supply
Pin 14 is the positive supply
Pins 1&2, 5&6, 8&9, 12&13 are gate inputs
Pins 3, 4, 10, 11 are gate outputs
The truth table for one of the four gates is shown to the right. For more information about the NOR gate in general, see this module. The arrangement of the CMOS components is shown below:
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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 7402, but can fulfill its function if the wiring is modified.
4001
IC Family
CMOS
Function Family
Logic
Description
Quad 2-Input NOR Gate
Pins
14
Pinout
Functional Diagram
Basic TTL Counterpart
7402
Truth Table (One Gate)
A
B
Q
0
0
1
0
1
0
1
0
0
1
1
0
