SN74HCS166DR

Shift Registers Overview

The SN74HCS166DR is an 8-bit parallel-load shift register from the HCS logic family, manufactured by Texas Instruments. It operates within a supply voltage range of 2 V to 6 V and supports an ambient temperature range of –40°C to +125°C. The device features Schmitt-trigger inputs for noise rejection and balanced CMOS push-pull outputs capable of ±7.8 mA drive current at 6 V. It is housed in a 16-pin SOIC package.

Shift Registers Feature Summary

• Schmitt-trigger inputs provide high noise immunity and tolerance for slow input signal transitions.
• Balanced CMOS push-pull outputs ensure similar sourcing and sinking current capabilities.
• Asynchronous clear input overrides all other functions to reset flip-flops immediately.

Shift Registers Applications

• Microcontroller input expansion
• 8-bit data storage

Shift Registers Procurement Notes

Verify the specific ordering suffix 'D' corresponds to the SOIC-16 package variant. Confirm that the component meets RoHS compliance requirements for your assembly process. Ensure the procurement channel provides valid traceability documentation consistent with Texas Instruments production standards.

Shift Registers Selection Notes

Select this component when system design requires robust noise rejection on input lines due to the integrated Schmitt-trigger architecture. The wide operating voltage range allows compatibility with various power domains. Consider the extended temperature rating for industrial environments where standard commercial grade parts may be insufficient.

Shift Registers Part Context

This part belongs to the SN74HCS series, which combines HCMOS speed with low power consumption and Schmitt-trigger functionality. The 'DR' suffix specifically denotes the SOIC-16 surface-mount package configuration offered by Texas Instruments for this logic function.

Shift Registers Replacement Considerations

SN74HCS166PW

Shift Registers FAQ

How does the SN74HCS166 handle slow input signals?

The device utilizes Schmitt-trigger inputs, which provide hysteresis to tolerate slow or noisy input signals without causing erratic switching behavior.

What is the function of the CLR pin?

The CLR (Clear) pin is an active-low asynchronous input that overrides all other inputs, including the clock, to reset all flip-flops to zero.