SN74LV165ABQBR

Shift Registers Overview

The SN74LV165ABQBR is a parallel-load, 8-bit shift register from Texas Instruments designed for VCC operation between 2 V and 5.5 V. It features balanced CMOS push-pull outputs and supports mixed-mode voltage operation on all ports. The device includes clock-inhibit functionality and a complemented serial output (QH). It is fully specified for partial-power-down applications using Ioff circuitry to prevent damaging current backflow when powered down.

Shift Registers Feature Summary

• Supports mixed-mode voltage operation across all ports
• Includes Ioff circuitry for partial-power-down mode compatibility
• Features clock-inhibit function and complemented serial output

Shift Registers Applications

• Increasing the number of inputs on a microcontroller

Shift Registers Procurement Notes

Verify that the BQB suffix corresponds to the WQFN package type as defined in the official datasheet. Confirm the specific revision level matches project requirements. Ensure input signals meet transition rate specifications to prevent oscillation. Unused inputs must be terminated to VCC or ground to ensure proper device operation.

Shift Registers Selection Notes

Select this component for designs requiring parallel-to-serial conversion with mixed-voltage interface capabilities. The low-drive CMOS architecture minimizes overshoot and undershoot, making it suitable for bus interface applications where output ringing is a concern. Verify thermal performance against junction temperature limits.

Shift Registers Part Context

This part belongs to the SN74LV165A family of parallel-load 8-bit shift registers. The 'LV' designation indicates Low-Voltage CMOS technology optimized for 2 V to 5.5 V supply ranges. The BQB suffix identifies the specific WQFN package variant within the broader product line.

Shift Registers Replacement Considerations

SN74LV165ADBR

Shift Registers FAQ

How does the Ioff feature function?

The Ioff circuitry disables all outputs when the supply pin is held at 0 V, preventing damaging current backflow through the device during partial-power-down states.

What is the purpose of the CLK INH input?

The CLK INH input provides a clock-inhibit function. Clocking occurs when SH/LD is high and CLK INH transitions from low to high, allowing data to shift toward the serial output.