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. The 74LS147 priority decoding of the inputs ensures that only the highest-order data line is encoded. Both devices have data inputs and outputs which are active at the low logic level.
74LS147 Features
74LS147 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 |
74LS147 Pinout Diagram
74LS147 Pin Description
| Pin No | Pin Name | Description |
| 1 | 4 | Input Pin 1 |
| 2 | 5 | Input Pin 2 |
| 3 | 6 | Input Pin 3 |
| 4 | 7 | Input Pin 4 |
| 5 | 8 | Input Pin 5 |
| 6 | C | Output Pin 3 |
| 7 | B | Output Pin 2 |
| 8 | GND | Ground Pin |
| 9 | A | Output Pin 1 |
| 10 | 9 | Input Pin 6 |
| 11 | 1 | Input Pin 7 |
| 12 | 2 | Input Pin 8 |
| 13 | 3 | Input Pin 9 |
| 14 | D | Output Pin 4 |
| 15 | NC | Not Connected |
| 16 | VCC | Positive Supply |
74LS147 Circuit
Applications
- Keyboard Encoding
- Range Selection
- Signal Transmission
74LS147 Alternative Equivalent
74LS148
Download 74LS147 10 to 4 Priority Encoder Datasheet from the link given below.
