74LS157 Pin Configuration
| Pin Number | Pin Name | Description |
| 2,5,11,14 | Input A | This is the first input line of the 2:1 Multiplexer |
| 3,6,10,13 | Input B | This is the second input line of the 2:1 Multiplexer |
| 4,7,9,12 | Output Y | This is the output line pin of the Multiplexer |
| 1 | Line Select (S) | The select pin selects one of the two input lines and gives it to the output line |
| 15 | Enable (E) | Active low pin. Grounded for normal operation |
| 8 | Ground | Connected to the ground of the system |
| 16 | Vcc | This pin powers the IC, typically +5V is used. |
74LS157 IC Features
- 2-Input Multiplexer Quad Package
- Type: Multiplexer
- Circuit : 4 x 2:1
- Independent Circuits: 1
- Voltage Supply Source: Single Supply
- Input Current: 0.8 mA
- Powering Current: 16 mA
- Propagation Delay: 9 ns
- Temperature Range: -65 °C – 150 °C
- Voltage – Supply: 4.75V ~ 5.25V
- Operating Temperature: 0C ~ 70C
- Package / Case: Through Hole
- Base Product Number: 74LS157
- Available in a 16-pin PDIP package
Note: Complete Technical Details can be found in the 74HC157 datasheet given at the end of this page.
Where to use 74LS157 Multiplexer
74LS157 is a 2-input (2:1) Multiplexer IC. It has four similar multiplexers inside it and hence it is called a Quad package 2-Input Multiplexer. A Multiplexer as we know takes in 2 or more inputs and provides one of them as the output based on the Select line status.
Similarly, this IC has two input pins (Input I0 and Input I1) and one output pin (Output Y) which forms a 2:1 Multiplexer. Likewise, there are 4 Multiplexers each of 2-inputs and 1-output corresponding to it, all these four Multiplexers are controlled through a single Line Select Pin (S) hence they cannot function independently. Hence if you are looking for a 2:1 Multiplexer IC with a quad package then this IC might be the right choice for you.
