74LS51 Dual 2-wide 2-input AND/OR Inverter Gate
Package PDIP, SOIC Series 74LS
74LS51 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. 74LS51 Dual 2-wide 2-input AND/OR Inverter Gate contains two independent 2-wide 2-input AND-OR-INVERT gates. They perform the Boolean function Y= AB' + CD'.
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
51.pdf
74LS51 features
- One 2-wide 2-input and 2-wide 3-input AND-OR-INVERT Gate
- Standard Pin Arrangement
- Fast Switching Times
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS51 pinout
| Pin | Name | Description |
|---|---|---|
| 1 | A1 | AND/OR Inverter Gate 1 Input 1 |
| 2 | A2 | AND/OR Inverter Gate 2 Input 1 |
| 3 | B2 | AND/OR Inverter Gate 2 Input 2 |
| 4 | C2 | AND/OR Inverter Gate 2 Input 3 |
| 5 | D2 | AND/OR Inverter Gate 2 Input 4 |
| 6 | Y2 | AND/OR Inverter Gate 2 Output |
| 7 | GND | Ground |
| 8 | Y1 | AND/OR Inverter Gate 1 Output |
| 9 | D1 | AND/OR Inverter Gate 1 Input 6 |
| 10 | E1 | AND/OR Inverter Gate 1 Input 5 |
| 11 | F1 | AND/OR Inverter Gate 1 Input 4 |
| 12 | B1 | AND/OR Inverter Gate 1 Input 2 |
| 13 | C1 | AND/OR Inverter Gate 1 Input 3 |
| 14 | VCC | Positive Supply |
74LS51 applications
- Data transmission control in digital electronics.
- Temperature detector circuits.
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