SNJ54HC166FK

Overview

The SNJ54HC166FK is a military-grade, 8-bit parallel-load shift register from the Texas Instruments HC logic family. It operates within 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 shifting, and direct overriding clear functions. It utilizes a 20-pin LCCC package with dimensions of 8.89mm by 8.45mm.

Feature Summary

• Provides parallel-to-serial conversion capabilities for data expansion
• Features synchronous load mode controlled by the SH/LD input pin
• Includes a direct overriding clear function that resets all flip-flops
• Supports clock gating via dedicated CLK and CLK INH inputs

Applications

• Increasing the number of inputs available to a microcontroller
• Parallel-to-serial data conversion in digital systems
• General-purpose I/O expansion without complex communication interfaces

Procurement Notes

Verify the specific ordering suffix FK corresponds to the 20-pin LCCC package configuration. Confirm that the military grade designation (SN prefix) meets the required environmental specifications for the intended application environment. Ensure compatibility with existing PCB footprints designed for ceramic leaded chip carriers.

Selection Notes

Select this component when high-temperature operation up to 125°C is required alongside standard CMOS logic levels. The HC series offers low power consumption compared to older bipolar technologies. Consider the LCCC package for applications requiring hermetic sealing or robust mechanical stability in harsh environments.

Part Context

This part belongs to the SNx4HC166 family of 8-bit parallel-load shift registers. The SN prefix indicates a military-grade device manufactured by Texas Instruments. It shares functional characteristics with commercial variants but adheres to stricter reliability and environmental standards defined for aerospace and defense applications.

Replacement Considerations

SN54HC166FK