74LS02 Quad 2-input NOR Gate
Package PDIP, SOIC Series 74LS
74LS02 overview
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.
Key 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
Datasheet
2.pdf
74LS02 features
- Four Independent NOR Gates
- Standard Pin Configuration
- Also Available in SMD Type
- Operating Temperature to 70°C
- Standard TTL Switching Voltages
74LS02 pinout
| 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 applications
- Mixer tank
Application circuit
More about 74LS02
74LS02 Circuit
Below is a simple circuit of NOR gate using NPN transistors with Button B1, B2 as input and LED as output.
74LS02 Alternative Equivalent
74LS27, 74LS32
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