SN74AHC165PWR

Shift Registers Overview

The SN74AHC165PWR is an 8-bit parallel-load shift register housed in a 16-pin TSSOP package. It operates within a supply voltage range of 2 V to 5.5 V and supports temperatures from -40°C to +125°C. The device features balanced CMOS push-pull outputs with 3-state capability, controlled by a separate output-enable input. It includes dedicated clocks for the shift and storage registers, a direct overriding clear input, and a serial output for cascading multiple units.

Shift Registers Feature Summary

• Provides asynchronous parallel loading via the SH/LD input to capture data from eight independent data pins simultaneously.
• Features balanced CMOS push-pull outputs that can source and sink similar currents while maintaining high-impedance states when disabled.
• Supports daisy-chain expansion through a dedicated serial output pin for connecting multiple devices to a single system controller line.

Shift Registers Applications

• Network switches
• Power infrastructures
• LED displays
• Servers

Shift Registers Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-16 package variant required for your PCB footprint. Confirm that the component meets the necessary RoHS compliance standards for your manufacturing process. Ensure the datasheet version matches the revision history to validate timing characteristics and absolute maximum ratings before finalizing procurement specifications.

Shift Registers Selection Notes

Select this component when a system requires converting parallel inputs into a serial stream for efficient microcontroller processing. The AHC logic family offers low delay and wide voltage compatibility suitable for modern digital interfaces. Consider the thermal resistance metrics if operating at high ambient temperatures or driving significant capacitive loads near the specified limits.

Shift Registers Part Context

This part belongs to the Texas Instruments SN74AHC165 series of 8-bit shift registers. It is designed to reduce the number of I/O lines required on a host controller by shifting stored parallel data out serially. The device integrates both shift and storage registers with distinct clocking mechanisms to manage data flow effectively.

Shift Registers Replacement Considerations

SN74AHC165BQBR

Shift Registers FAQ

How does the device handle unused standard CMOS inputs?

Unused inputs must never be left floating during operation. They should be terminated to either VCC or ground using a pull-up or pull-down resistor, typically 10 kΩ, to prevent oscillations and excessive power consumption caused by slow signal transitions.

What is the function of the CLK INH input?

The CLK INH (Clock Inhibit) input prevents the shift register from advancing its state. When held high, it inhibits the clock signal, ensuring the internal register contents remain unchanged regardless of the CLK pin activity.