SN74HC157DTE4

Overview

The SN74HC157DTE4 is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments. It operates within a supply voltage range of 2V to 6V and supports an operating temperature from -40°C to 85°C. The device features four independent multiplexers controlled by a common address select (A/B) input and a strobe (G) input. It provides TTL-compatible CMOS inputs, low power consumption with a maximum ICC of 80µA, and outputs capable of driving up to 15 LSTTL loads.

Feature Summary

• Contains four independent 2-to-1 multiplexers for data routing
• Features TTL-compatible CMOS inputs for direct interface with logic devices
• Includes a common address select input to control all channels simultaneously
• Provides active-low strobe functionality to force all outputs low

Applications

• Multiplexing and data routing applications
• Switching 4-bit data buses between source devices
• System controller interfaces requiring data selection

Procurement Notes

Verify the specific package type and marking against the datasheet before procurement. Confirm that the ordering suffix matches the required tape-and-reel or tube packaging configuration. Ensure the component meets the specified RoHS compliance status for your manufacturing process. Cross-reference the manufacturer part number with official distributor catalogs to validate authenticity and revision history.

Selection Notes

Select this component when a quadruple 2-to-1 multiplexer is required for high-speed data switching. It is suitable for designs needing TTL-compatible inputs and wide voltage operation. Consider the SOIC-16 package dimensions for PCB layout constraints. Evaluate the propagation delay specifications against system timing requirements at the target supply voltage.

Part Context

This device belongs to the SNx4HC157 family of high-speed silicon gate CMOS multiplexers. It is designed for efficient data routing in digital systems. The HC series offers improved speed and lower power consumption compared to older logic families. It serves as a standard solution for selecting between multiple data sources in microcontroller and logic circuits.

Replacement Considerations

SN74HC157DR

FAQ

How does the strobe input affect the outputs?

A high level at the strobe (G) terminal forces all Y outputs low, regardless of the state of the address select or data inputs.

What is the function of the A/B input?

The A/B input acts as the address select line, determining which of the two data sources (A or B) is routed to the corresponding output channel.

Can unused inputs be left floating?

No, unused inputs must be terminated at VCC or GND to ensure proper device operation and prevent excessive power consumption or oscillations.