74157 Quad 2-to-1 Data Selector/Multiplexer PDIP-16
The 74157 Quad 2-to-1 Data Selector/Multiplexer PDIP-16 is a high-speed, low-power Schottky TTL quad multiplexer provided in a PDIP-16 through-hole package, designed to select a four-bit word from one of two sources using a single common select input and an active-low enable (strobe) for bus, address and data-selection applications.
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.
Features:
- Four independent 2-to-1 data selectors with buffered non-inverting outputs suitable for true data routing applications.
- Single common Select input for simultaneous channel selection across all four channels.
- Active-low enable (strobe) to place all outputs in the high-impedance state for bus sharing and multiplexed systems.
- Low-power Schottky (LS) TTL technology with standard 5V supply compatibility.
- Industry standard PDIP-16 footprint for easy through-hole prototyping and retrofit replacement.
Pinout Diagram:
| 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 |
Specifications:
Absolute Maximum Ratings
| Parameter | Value | Unit / Notes |
|---|---|---|
| Supply voltage, VCC (Note 1) | 7 | V |
| Input voltage | 7 | V |
| Operating free-air temperature range | 0 to +70 | °C |
| Storage temperature range | -65 to +150 | °C |
Note 1: Voltage values are with respect to network ground terminal.
Recommended Operating Conditions
| Symbol | Parameter | Min. | Nom. | Max. | Unit |
|---|---|---|---|---|---|
| VCC | Supply voltage | 4.75 | 5 | 5.25 | V |
| IOH | High-level output current | -800 | µA | ||
| IOL | Low-level output current | 16 | mA | ||
| TA | Operating free-air temperature | 0 | 70 | °C |
Complete technical details can be found in the 74HC157 datasheet given at the end of this page.
Applications:
- Multiplexing and selection of 4-bit data or address buses in microprocessor systems.
- Bus isolation and sharing where multiple devices drive a common bus.
- Glue logic and combinational data routing in digital control systems.
- Memory and peripheral address/data selection.
- Prototyping and educational digital logic projects where an industry-standard PDIP is required.
Package Contents:
- 1x 74157 Quad 2-to-1 Data Selector/Multiplexer PDIP-16
Documents:
| Datasheet | SN74LS157N |
| CAD Files | Download |