7400 (Integrated circuit)

7400

7400 Integrated circuit diagram
Type	Logic gate
Pin configuration	14 Standard, 8 and 20-pin variants

NAND gate truth table
Input		Output
A	B	A NAND B
0	0	1
0	1	1
1	0	1
1	1	0

The 7400 Integrated circuit is a TTL Quad 2-Input NAND gate, complementing the CMOS equivalent, the 4011. The 7400 is a commonly used chip in the world of discreet integrated circuits, as it can be used to build any alternative of the logic gates.

These devices contain four (except in the case of the SO package, where two are only present) independent 2-input NAND gates. They perform the Boolean function $Y={\overline {A\cdot B}}$ in positive logic.

An diagram of the 7400 DIL chip with pin numbers and labels.

Pin functions

Pin					I/O	Description
Name	Package
	CDIP, PDIP, SOIC, SO, SSOP, CFP	SO (SN74xx00)	CFP (SN5400)	LCCC
1A	1	1	1	2	I	Gate 1 input
1B	2	2	2	3	I	Gate 1 input
1Y	3	3	3	4	O	Gate 1 output
2A	4	6	6	6	I	Gate 2 input
2B	5	7	7	8	I	Gate 2 input
2Y	6	5	5	9	O	Gate 2 output
3A	10	—	9	13	I	Gate 3 input
3B	9	—	10	14	I	Gate 3 input
3Y	8	—	8	12	O	Gate 3 output
4A	13	—	12	18	I	Gate 4 input
4B	12	—	13	19	I	Gate 4 input
4Y	11	—	14	16	O	Gate 4 output
GND	7	4	11	10	—	Ground
NC	—	—	—	1, 5, 7, 11, 15, 17	—	No connect
VCC	14	8	4	20	—	Power supply