SN74HC166PW

Shift Registers Overview

The SN74HC166PW is an 8-bit parallel-load shift register from the Texas Instruments HC logic family, housed in a 16-pin TSSOP package. It operates on a supply voltage range of 2V to 6V and supports an operating temperature range of -55°C to 125°C. The device features synchronous loading, serial-to-serial/parallel shifting, and an asynchronous clear function. Key electrical parameters include a maximum propagation delay of 38ns at 6V, typical power dissipation capacitance of 50pF, and output drive capabilities up to 10 LSTTL loads.

Shift Registers Feature Summary

• Synchronous parallel load capability for immediate data entry
• Asynchronous clear input that overrides all other functions
• Gated clock inputs allowing flexible shift control

Shift Registers Applications

• Increasing microcontroller input/output capacity
• Parallel-to-serial data conversion
• Serial-to-parallel data conversion

Shift Registers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Product Information Page to confirm package type, lead finish, and moisture sensitivity level. Ensure the requested variant matches the required operating temperature range and RoHS compliance status defined in the latest datasheet revision.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with synchronous parallel loading and high-speed CMOS performance is required. The wide supply voltage range and TTL-compatible inputs make it suitable for interfacing with various digital logic families in space-constrained designs utilizing surface-mount technology.

Shift Registers Part Context

This part belongs to the SNx4HC166 series of 8-bit parallel-load shift registers. The 'PW' suffix specifically denotes the 16-pin Thin-Shrink Small-Outline Package (TSSOP), which offers a compact footprint compared to standard SOIC or DIP packages while maintaining similar electrical characteristics.

Shift Registers Replacement Considerations

SN74HC166DR

Shift Registers FAQ

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

When SH/LD is low, parallel data inputs are enabled for synchronous loading. When SH/LD is high, the device shifts data serially on the rising edge of the clock pulse.

What is the function of the CLR input?

The CLR input provides an asynchronous clear function that resets all flip-flops to zero, overriding all other inputs including the clock signal.