74LS33 QUAD 2-INPUT NOR BUFFER (OPEN COLLECTOR)
Package PDIP, SOIC Series 74LS
74LS33 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. 74LS33 QUAD 2-INPUT NOR BUFFER (OPEN COLLECTOR) containing four independent 2 input NOR buffer gates with open-collector outputs. Open collector outputs require resistive pull-up to perform logically but can deliver higher VOH levels and are commonly used in wired-AND applications
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
33.pdf
74LS33 features
- Three Independent NOR Gates
- Standard Pin Configuration
- Fast Switching Times
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS33 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | C1 | NOR BUFFER 1 Output |
| 2 | A1 | NOR BUFFER 1 Input 1 |
| 3 | B1 | NOR BUFFER 1 Input 2 |
| 4 | C2 | NOR BUFFER 2 Output |
| 5 | A2 | NOR BUFFER 2 Input 1 |
| 6 | B2 | NOR BUFFER 2 Input 2 |
| 7 | GND | Ground |
| 8 | A3 | NOR BUFFER 3 Input 1 |
| 9 | B3 | NOR BUFFER 3 Input 2 |
| 10 | C3 | NOR BUFFER 3 Output |
| 11 | A4 | NOR BUFFER 4 Input 1 |
| 12 | B4 | NOR BUFFER 4 Input 2 |
| 13 | C4 | NOR BUFFER 4 Output |
| 14 | VCC | Positive Supply |
74LS33 applications
- Mixer tank
More about 74LS33
74LS33 Alternative Equivalent
74LS02, 74LS27
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