M74HCT157B1R

Overview

The M74HCT157B1R is a high-speed CMOS quad 2-channel multiplexer fabricated with silicon gate C2MOS technology. It consists of four 2-input digital multiplexers sharing common select and strobe inputs. The device operates within a supply voltage range of 4.5V to 5.5V, featuring low power dissipation with a maximum quiescent current of 4μA at 25°C. It provides symmetrical output impedance with minimum drive currents of 4mA for both high and low states. Propagation delays are balanced, typically measuring 16ns at VCC = 4.5V.

Feature Summary

• Contains four independent 2-input digital multiplexers with shared selection logic
• Features active-low strobe input that inhibits data selection and forces outputs low when held high
• Includes protection circuits on all inputs against static discharge and transient excess voltage

Applications

• Routing multiple digital data sources to a single destination line
• Implementing address decoding in digital systems
• Data switching applications requiring synchronized channel selection

Procurement Notes

Verify component authenticity through authorized channels as the part is marked obsolete. Confirm package integrity upon receipt, specifically checking for DIP-16 physical conformity. Ensure compatibility with existing PCB footprints before finalizing procurement decisions.

Selection Notes

Select this component for designs requiring quad multiplexing functionality within standard 74 series logic families. Verify that the operating environment remains within the specified -55°C to 125°C temperature range. Ensure supply voltage stability between 4.5V and 5.5V to maintain signal integrity and timing specifications.

Part Context

This component belongs to the M74HCT157 family of logic integrated circuits manufactured by STMicroelectronics. It utilizes C2MOS technology to achieve high-speed performance while maintaining low power consumption standards typical of HCT logic devices.

Replacement Considerations

CD74HCT157E Texas Instruments

FAQ

How does the strobe input affect the multiplexer operation?

When the strobe input is held high, data selection is inhibited and all outputs become low.

What is the typical propagation delay for this device?

The typical propagation delay is 16ns at a supply voltage of 4.5V.