The 74LS147 features priority decoding of the inputs to ensure that only the highest-order data line is encoded. The 74LS147 encode nine data lines to four-line (8-4-2-1) BCD. The 74LS147 has built-in Schottky barrier diode to process for high speed. The 74LS147 IC has a wide range of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL. The output of the IC always comes in TTL which makes it easy to work with other TTL devices and microcontrollers.
What is a Priority Encoder?
A priority encoder provide ‘n’ bits of binary coded output representing the position of the highest order active input of 2n inputs. If two or more inputs are high at the same time, the input having the highest priority will take precedence.
74LS147 Pinout
74LS147 Pin Configuration
| Pin No | Pin Name | Description |
|---|---|---|
| 1 | 4 | Decimal Input Pin 1 |
| 2 | 5 | Decimal Input Pin 2 |
| 3 | 6 | Decimal Input Pin 3 |
| 4 | 7 | Decimal Input Pin 4 |
| 5 | 8 | Decimal Input Pin 5 |
| 6 | C | Output Pin C |
| 7 | B | Output Pin B |
| 8 | GND | Ground Pin |
| 9 | A | Output Pin A |
| 10 | 9 | Decimal Input Pin 10 |
| 11 | 1 | Decimal Input Pin 11 |
| 12 | 2 | Decimal Input Pin 12 |
| 13 | 3 | Decimal Input Pin 13 |
| 14 | D | Output Pin D |
| 15 | NC | Not Used |
| 16 | Vcc | Chip Supply Voltage |
74LS147 Features & Specifications
- Technology Family: LS
- Rating: Catalog
- Supply voltage: 4.75V to 5.5V
- Frequency at nominal voltage: 35 MHz
- Typical propagation delay: 21nS
- Low power consumption: 32mW
- ESD protection
- Operating temperature: 0ºC to 70ºC
- ESD CDM (kV): 0.75
- ESD HBM (kV): 2
- Balanced propagation delays
- Designed specifically for high speed
- IOL (Max): 8mA
- IOH (Max): -0.4mA
- Bits (#): 4
- Channels (#): 2
- Configuration: 2:4 & 8:3
- Product type: Standard
Applications
- It is used to control interrupt requests by acting on the highest priority request
- Also used to encode the output of a flash analog to digital converter
You can download this Datasheet for 74LS147 10-To-4 Line Priority Encoder from the link given below:
See Also: 74LS08 Quadruple Two Input AND Gate IC |74LS32 Quad 2 – Input OR Logic Gate IC| 74LS25 Dual 4 – Input NOR Gate IC with Strobe
