74157 ic Quad 2 to1 Data Selector/Multiplexer 16 pin
74157 ic Quad 2 to1 Data Selector/Multiplexer 16 pin
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:
74HC157 Multiplexer Working
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