74LS02 Quad 2-input NOR Gate

The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS02 Quad 2-input NOR Gate contains four independent 2-input-NOR gates.

74LS02 Features

• Four Independent NOR Gates
• Standard Pin Configuration
• Also Available in SMD Type
• Operating Temperature to 70°C
• Standard TTL Switching Voltages

74LS02 Specifications

Supply Voltage	4.75 – 5.25Vdc
Maximum Clock Frequency	40Mhz
Power Dissipation	2mW/gate @100kHz
Minimum Output Current	8mA
Propagation Delay	10nS
Fan Out (TTL Loads)	20

74LS02 Pinout Diagram

74LS02 Pin Description

Pin No	Pin Name	Description
1	C1	NOR Gate 1 Output
2	A1	NOR Gate 1 Input 1
3	B1	NOR Gate 1 Input 2
4	C2	NOR Gate 2 Output
5	A2	NOR Gate 2 Input 1
6	B2	NOR Gate 2 Input 2
7	GND	Ground
8	A3	NOR Gate 3 Input 1
9	B3	NOR Gate 3 Input 2
10	C3	NOR Gate 3 Output
11	A4	NOR Gate 4 Input 1
12	B4	NOR Gate 4 Input 2
13	C4	NOR Gate 4 Output
14	VCC	Positive Supply

74LS02 Circuit

Below is a simple circuit of NOR gate using NPN transistors with Button B1, B2 as input and LED as output.

Applications

• Mixer tank

74LS02 Alternative Equivalent

74LS27, 74LS32

Download 74LS02 Quad 2-input NOR Gate Datasheet from the link given below