CD54HCT165F3A

Shift Registers Overview

The CD54HCT165F3A is an 8-bit parallel-in/serial-out shift register from the Texas Instruments HCT logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a wide operating temperature range from -55°C to +125°C. The device features buffered inputs, asynchronous parallel load capability, and complementary serial outputs (QH and QH). It provides direct LSTTL input logic compatibility with a maximum propagation delay of 60 ns at 4.5 V.

Shift Registers Feature Summary

• Asynchronous parallel data loading via dedicated SH/LD control input
• Complementary serial output configuration for expanded system connectivity
• Direct compatibility with LSTTL logic levels for simplified interfacing

Shift Registers Applications

• Parallel-to-serial data conversion circuits
• Expansion of shift register chains using cascaded devices
• Military and defense electronic systems requiring extended temperature operation

Shift Registers Procurement Notes

Verify that the specific part number matches the military-grade CD54 series designation rather than the commercial CD74 variant. Confirm the F3A suffix corresponds to the ceramic CDIP package type required for the intended application environment. Ensure compliance with RoHS exemption status as indicated in the manufacturer's orderable addendum documentation.

Shift Registers Selection Notes

Select this component when high-speed CMOS performance is required alongside TTL-compatible input thresholds. The HCT series ensures seamless integration with existing LSTTL logic families without level shifting requirements. Consider the military temperature rating and ceramic packaging for environments demanding superior thermal stability and reliability compared to standard plastic packages.

Shift Registers Part Context

This device belongs to the CDx4HCT165 family of 8-bit shift registers manufactured by Texas Instruments. It shares functional similarities with the HC series but offers distinct electrical characteristics tailored for 5V logic systems. The CD54 prefix indicates a military-grade qualification level, distinguishing it from the commercial CD74 equivalents available in different package styles.

Shift Registers Replacement Considerations

CD54HC165F3A

Shift Registers FAQ

How does the device handle parallel data entry?

Parallel data from inputs A through H is loaded asynchronously into the register whenever the SH/LD input is held at a low voltage level.

What is the function of the CLK INH input?

The CLK INH input inhibits clock pulses, preventing data shifting during serial operations when held low while the clock signal transitions.