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. 74LS157 data selectors/multiplexers contain inverters and drivers to supply full on-chip data section to the four output gates
74LS157 Features
- Contains Four Multiplexers To Select Data Input and Pass This to the Output
- Fast Propagation Time
- Low Power
- Operating Temperature up to 70°C
- Standard TTL Switching Voltages
74LS157 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 |
74LS157 Pinout Diagram
74LS157 Pin Description
| Pin No | Pin Name | Description |
| 1 | S | Common Select Input |
| 2 | I0a | Data Input from Source 0 |
| 3 | I1d | Data Input from Source 1 |
| 4 | Za | Multiplexer Output |
| 5 | I0b | Data Input from Source 0 |
| 6 | I1b | Data Inputs from Source 1 |
| 7 | Zb | Multiplexer Output |
| 8 | GND | Ground |
| 9 | Zd | Multiplexer Output |
| 10 | I1d | Data Inputs from Source 1 |
| 11 | I0d | Data Inputs from Source 0 |
| 12 | Zc | Multiplexer Output |
| 13 | I1c | Data Inputs from Source 1 |
| 14 | I0c | Data Inputs from Source 0 |
| 15 | E’ | Enable (Active LOW) Input |
| 16 | VCC | Positive Supply |
Applications
74LS157 Alternative Equivalent
74LS153
Download 74LS157 Quad 2/1 Data Selector Datasheet from the link given below.
