7402 (Integrated circuit)

NOR gate truth table
Input		Output
A	B	A NAND B
0	0	1
0	1	0
1	0	0
1	1	0

The 7402 integrated circuit is a TTL Quad 2-Input NOR gate, complementing the CMOS equivalent, the 4001.

These devices contain four independent 2-input NOR gates. They perform the Boolean function $Y={\overline {A+B}}$ in positive logic.

ANSI Symbol

Pin functions

Pin					I/O	Description
Name	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

Specifications

Absolute maximums

		Min	Max	Unit
Supply voltage, VCC		-0.5	7	V
Input voltage	SNx402 and SNxS402		5.5	V
	SNx4LS02		7
Junction temperature, TJ			150	°C
Storage temperature, Tstg		-65	150	°C

Recommended operating conditions

			Min	Nom	Max	Unit
VCC	Supply voltage	SN54xx02 and SNxxHCT02	4.5	5	5.5	V
		SN74xx02	4.75	5	5.25
		SNxxHC02	2	5	6
VIH	High-level input voltage	SN74xx02, SN54xx02	2			V
		SNxxHC02; VCC = 2 V	1.5
		SNxxHC02; VCC = 4.5 V	3.15
		SNxxHC02; VCC = 6 V	4.2
VIL	Low-level input voltage	SNx402, SN7LS402 and SNx4S02			0.8	V
		SN54LS02			0.7
		SNxxHC02; VCC = 2 V			0.5
		SNxxHC02; VCC = 4.5 V			1.35
		SNxxHC02; VCC = 6 V			1.8
IOH	High-level output current	SN5402, SN54LS02 and SN74LS02			-0.4	mA
		SNx4S02			-1
IOL	Low-level output current	SNx402			16	mA
		SN5LS402			4
		SN7LS402			8
		SNx4S02			20
		SNxxHC02 and SNxxHCT02			25
TA	Operating free-air temperature	SN54xx02	-55		125	°C
		SN74xx02	0		70