SN74HC157PWR

Overview

The SN74HC157PWR 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 utilizes TSSOP-16 packaging with a body size of 5.00 mm × 4.40 mm. Electrical characteristics include a typical propagation delay of 11ns at 5V, maximum low-level output current of 7.8mA, and maximum high-level output current of -7.8mA.

Feature Summary

• Contains four independent 2-to-1 multiplexers sharing a single address select input
• Features TTL-compatible CMOS inputs for direct interfacing with standard logic families
• Includes an active-low strobe input that forces all outputs to a low state when asserted

Applications

• Switching a 4-bit data bus between two source devices
• Data routing in digital systems requiring multiple channel selection
• Multiplexing applications where asynchronous operation is required

Procurement Notes

Verify the specific package type and lead finish against the latest TI Package Option Addendum before ordering. Confirm that the operating temperature range meets system requirements, as the PWR suffix indicates surface mount construction. Ensure unused inputs are terminated to VCC or GND to prevent excessive power consumption and oscillation during operation.

Selection Notes

Select this component for designs requiring multiple independent data paths controlled by a shared address line. The HC series offers a balance of speed and power consumption suitable for general-purpose logic applications. Consider the 50pF capacitive load limit for optimal performance without exceeding specified switching characteristics.

Part Context

This part belongs to the SNx4HC157 family of quadruple 2-to-1 multiplexers. It is part of the broader 74HC logic series, which provides wide voltage operation and compatibility with various logic standards. The device serves as a fundamental building block for data selection and routing in complex digital circuits.

Replacement Considerations

SN74HC157DBR

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 happens if CMOS inputs are left floating?

Unused inputs must be terminated at VCC or GND. Leaving them floating can result in excessive power consumption, oscillations, and reduced device reliability.