SNJ54LS166AFK

Overview

The SNJ54LS166AFK is a military-grade, eight-bit parallel-in serial-out shift register manufactured by Texas Instruments. It operates within an extended temperature range of -55°C to 125°C and utilizes the LS logic series for standard switching performance. The device is housed in a 20-pin LCCC (Leadless Ceramic Chip Carrier) package with a 1.27 mm lead pitch. Key functional features include a dedicated serial data input, a clock enable control, and a parallel load capability that allows direct data entry into the internal flip-flops.

Feature Summary

• Provides eight-bit parallel-to-serial conversion capabilities for digital data processing applications
• Includes a dedicated serial data input pin for cascading multiple units or continuous bit-stream shifting
• Features a clock enable control mechanism to synchronize data transitions with system timing requirements

Applications

• Military communication systems requiring robust serial data transmission
• Defense electronics utilizing high-reliability shift registers
• Aerospace instrumentation involving parallel data acquisition and serial output

Procurement Notes

Verify the NRND status before finalizing design implementations. Confirm the specific ordering suffix matches the required package variant. Ensure environmental compliance documentation aligns with project specifications. Validate the operating temperature range against the intended deployment conditions. Review the manufacturer's product life cycle notifications for potential obsolescence risks.

Selection Notes

Select this component when military-grade reliability and wide temperature tolerance are mandatory. Compare against commercial variants if extreme environmental conditions are not present. Evaluate the LCCC package suitability for the target PCB assembly process. Consider the LS logic family speed characteristics relative to the system clock frequency requirements.

Part Context

This part belongs to the SN54LS166A family of shift registers designed for defense and aerospace markets. It shares core functionality with commercial counterparts but adheres to stricter manufacturing and testing standards. The LCCC package provides hermetic sealing suitable for harsh environments. It serves as a critical interface between parallel data buses and serial communication lines.

Replacement Considerations

SNJ54LS166AJ

FAQ

What is the primary function of the clock enable input?

The clock enable input controls whether the shift register advances its state on the rising edge of the clock signal, allowing synchronization with external timing events.

How does the parallel load feature operate?

When the parallel load input is activated, the data present at the eight parallel input pins is transferred directly into the internal flip-flops, overriding the shifting operation.