SN74HCS166PWR

Shift Registers Overview

The SN74HCS166PWR is an 8-bit parallel-load shift register from the Texas Instruments HCS logic family, housed in a 16-pin TSSOP package. It operates on 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. Typical supply current is 100 nA.

Shift Registers Feature Summary

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

Shift Registers Applications

• Microcontroller input expansion
• 8-bit data storage

Shift Registers Procurement Notes

Verify the specific ordering suffix 'PWR' corresponds to the TSSOP-16 package variant. Confirm that the component meets RoHS requirements as indicated in official documentation. Ensure the selected part number matches the required thermal and electrical specifications for your operating environment.

Shift Registers Selection Notes

Select this component when system design requires robust noise rejection for slow or noisy signals. The wide supply voltage range allows compatibility with various logic levels. Consider the extended temperature rating for industrial applications requiring operation up to +125°C.

Shift Registers Part Context

This device belongs to the SN74HCS series, which utilizes HCMOS technology to achieve low power consumption while maintaining high-speed performance. The HCS designation indicates the inclusion of Schmitt-trigger inputs, distinguishing it from standard HC logic families.

Shift Registers Replacement Considerations

SN74HC166PW

Shift Registers FAQ

How does the SN74HCS166 handle slow input signals?

The device incorporates Schmitt-trigger inputs, which provide hysteresis to tolerate slow input transitions without causing undefined states or excessive power consumption.

What is the function of the CLR pin?

The CLR (Clear) pin provides an asynchronous reset function. When active low, it overrides all other inputs, including the clock, and resets all flip-flops to zero.