SN74HC157DBR

Overview

The SN74HC157DBR is a quadruple 2-line to 1-line data selector/multiplexer manufactured by Texas Instruments in the HC logic series. 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 an active-low strobe (G) input. Electrical characteristics include a typical propagation delay of 11ns at 5V with 50pF load, maximum low-level output current of 7.8mA, and maximum high-level output current of -7.8mA. Input leakage current is limited to 1µA maximum.

Feature Summary

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

Applications

• Routing a 4-bit data bus between two source devices
• Data selection and switching applications
• Multiplexing control signals in digital systems

Procurement Notes

Verify the specific ordering suffix 'DB' corresponds to the SSOP-16 package configuration required for your PCB layout. Confirm the RoHS compliance status and lead finish details via the manufacturer's official documentation before finalizing procurement specifications.

Selection Notes

Select this component when a compact surface-mount solution is needed for routing multiple data lines simultaneously. Ensure the design accommodates the specified input transition times to prevent excessive power consumption or oscillation due to slow signal edges.

Part Context

This part belongs to the SNx4HC157 family of high-speed silicon gate CMOS multiplexers. It provides a cost-effective alternative to discrete logic solutions for managing data flow in complex digital circuits while maintaining compatibility with standard logic levels.

Replacement Considerations

SN74HC157DR

FAQ

How does the strobe (G) input affect the outputs?

When the strobe (G) input is held at a high level, it forces all four Y outputs to a low state, regardless of the states of the A/B select or data inputs.

What happens if CMOS inputs are left floating?

Standard CMOS inputs must not be left floating during operation. Unused inputs should be terminated at VCC or GND to prevent excessive power consumption and potential oscillations.