SN74HC165DE4

Shift Registers Overview

The SN74HC165DE4 is an 8-bit parallel-load shift register from Texas Instruments' HC logic family. It converts eight parallel data inputs into a serial output stream, facilitating efficient data transmission in digital systems. The device operates within a supply voltage range of 2 V to 6 V and supports high-speed clocking up to 25 MHz at 5 V. It features a low-impedance complementary output (Q_H) for noise reduction and includes dedicated pins for serial data input, clock inhibit, and synchronous parallel loading.

Shift Registers Feature Summary

• Provides eight independent direct data inputs for simultaneous parallel loading when the shift/load control signal is asserted low.
• Features a clock inhibit function that allows the internal state to be preserved independently of the clock signal activity.
• Delivers a complementary serial output (Q_H) alongside the standard Q_L output to minimize switching noise during operation.

Shift Registers Applications

• Keyboard matrix scanning interfaces
• Industrial I/O expansion modules
• Data acquisition systems requiring parallel-to-serial conversion

Shift Registers Procurement Notes

Verify the specific suffix 'E4' indicates lead-free packaging compliant with RoHS standards. Confirm the SOIC-16 package dimensions match the target PCB footprint. Ensure the operating temperature range aligns with system requirements. Cross-reference the manufacturer datasheet for exact electrical characteristics before finalizing procurement specifications.

Shift Registers Selection Notes

Select this component when an 8-bit parallel-to-serial interface is required within the HC logic family constraints. Consider the 2 V to 6 V supply range compatibility with the system's power rails. Evaluate the propagation delay specifications against the maximum clock frequency needed for the application timing budget.

Shift Registers Part Context

This part belongs to the SNx4HC165 series of 8-bit parallel-load shift registers manufactured by Texas Instruments. It is part of the broader 74HC logic family, designed for CMOS technology applications requiring low power consumption and high noise immunity compared to older TTL standards.

Shift Registers Replacement Considerations

SN74HC165DRE4: Same functional device in a tape-and-reel packaging format instead of tube.