SN74HC166NS

Shift Registers Overview

The SN74HC166NS is an 8-bit parallel-load shift register from the Texas Instruments HC logic family, housed in a 16-pin NS (SOP) package. It operates within a supply voltage range of 2V to 6V and supports a recommended operating temperature range of -55°C to +125°C. The device features TTL-compatible CMOS inputs, synchronous loading capability, and direct overriding clear functionality. Electrical characteristics include a maximum propagation delay of 38ns at 6V and output drive capabilities suitable for up to 10 LSTTL loads.

Shift Registers Feature Summary

• Supports parallel-to-serial conversion with synchronous data loading
• Features direct overriding clear input to reset all flip-flops
• Includes gated clock inputs for flexible shifting control

Shift Registers Applications

• Increasing the number of inputs available to a microcontroller
• Parallel-to-serial data conversion circuits
• General-purpose I/O expansion using simple GPIO pins

Shift Registers Procurement Notes

Verify that the specific orderable part number matches the required package type and temperature rating. Confirm RoHS compliance status and lead finish specifications against current manufacturer documentation. Ensure design requirements align with the absolute maximum ratings and recommended operating conditions provided in the official datasheet.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with parallel load capability is required in a surface-mount SOP package. The HC series offers wide voltage operation and high noise immunity. Consider the thermal resistance and junction temperature limits if operating near the upper temperature extremes or under heavy capacitive loads.

Shift Registers Part Context

This device belongs to the SNx4HC166 family of 8-bit parallel-load shift registers manufactured by Texas Instruments. The HC designation indicates High-speed CMOS technology, providing compatibility with standard logic families while maintaining low power consumption. The NS suffix specifically denotes the 16-pin Small Outline Package variant.

Shift Registers Replacement Considerations

SN74HC166N

Shift Registers FAQ

How does the SH/LD input control the device mode?

When SH/LD is high, the device enables serial shifting on the rising edge of the clock. When SH/LD is low, parallel data inputs are loaded synchronously with the next clock pulse.

What is the function of the CLR input?

The CLR input provides a direct overriding clear function that resets all internal flip-flops to zero, regardless of the clock or other input states.