SN74HC166PWR

Shift Registers Overview

The SN74HC166PWR 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 via the SH/LD input and serial shifting triggered by the rising edge of the clock signal. It includes a direct overriding clear (CLR) input for asynchronous reset and provides push-pull outputs capable of driving up to 10 LSTTL loads.

Shift Registers Feature Summary

• Synchronous parallel data loading capability controlled by the SH/LD input pin
• Asynchronous clear function that overrides all other inputs to reset internal registers
• Gated clock architecture utilizing separate CLK and CLK INH pins for flexible timing control
• Standard CMOS inputs with high impedance characteristics requiring defined termination states

Shift Registers Applications

• Expanding microcontroller input/output capabilities without dedicated communication interfaces
• Parallel-to-serial data conversion for digital systems
• General-purpose shift register operations in embedded logic circuits

Shift Registers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm active production status and material compliance. Ensure the selected variant matches the required thermal resistance and lead finish specifications for the target assembly process. Cross-reference the datasheet revision history to validate updated electrical parameters and operating temperature ranges before finalizing procurement.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with synchronous parallel load functionality is required within the HC logic family. The TSSOP package is suitable for surface-mount applications requiring compact board space. Consider the wide operating temperature range and TTL-compatible input thresholds if interfacing with legacy logic families or demanding environmental conditions.

Shift Registers Part Context

This device belongs to the SNx4HC166 series of 8-bit parallel-load shift registers manufactured by Texas Instruments. The 'PWR' suffix specifically denotes the 16-pin Thin-Shrink Small-Outline Package (TSSOP) variant. This part is part of the broader 74HC logic family, designed for low power consumption and high noise immunity in standard CMOS applications.

Shift Registers Replacement Considerations

The CD74HC166MT is listed as a discontinued alternative with available stock from Nexperia. Verify pinout compatibility and electrical parameter alignment before substituting.