74LS Series ICs are High-Speed Logic gates, ideally a little faster than 74HC series but more power consumption is required. They are implemented with a Low-Power Schottky diode technology to achieve high switching speed. 74LS148 is one of the 74LS series IC. 74LS148 ICs contain an 8 to 3-Bit priority encoder that converts 8 Data Lines to 3-Line binary. Cascading circuitry (enable input EI and enable output EO) has been provided to allow octal expansion without the need for external circuitry.
The 74LS148 ICs have an operating range of VCC from 4.5 V to 5.5 V. Maximum current consumption is 20 mA through Icc and 0.2 mA per input pin. And the maximum propagation delay is 15 ns. They can provide 0.4 mA at High Input and 8 mA at Low Input. They allow inputs and outputs up to VCC. The recommended operating VCC is 5 V.
Specification:
| Operating Voltage Range | 4.5 V to 5.5 V |
| Package | DIP−16 |
| Input Current | 0.2 mA |
| Powering Current | 20 mA |
| Propagation Delay | 15 ns |
| Temperature Range | -65 °C - 150 °C |
Pin Configuration:
| Input ([0:8]) | 10, 11, 12, 13, 1, 2, 3, 4 |
| Output (A0, A1, A2) | 9, 7, 6 |
| Enable Input (EI) | 5 |
| Enable Output (EO) | 15 |
| Low Group Signal (GS') | 14 |
| Power Supply (VCC) | 16 |
| Ground (GND) | 8 |
| Country of Origin | China |
Application:
- n-Bit Encoding
- Code Converters and Generators
