SN74HCS165BQBR

Shift Registers Overview

The SN74HCS165BQBR is an 8-bit parallel-load shift register from the Texas Instruments HCS logic family, housed in a WQFN-16 package. It operates on a supply voltage ranging from 2 V to 6 V and supports an extended ambient temperature range of –40°C to +125°C. The device features Schmitt-trigger inputs for noise tolerance and balanced CMOS push-pull outputs capable of ±7.8-mA drive current at 6 V. It provides serial-in, parallel-out functionality with asynchronous loading.

Shift Registers Feature Summary

• Schmitt-trigger inputs provide high noise immunity and support slow input signal transitions
• Balanced CMOS push-pull outputs deliver strong drive capability for reliable data transmission
• Asynchronous parallel load allows immediate data capture independent of clock signals

Shift Registers Applications

• Increasing the number of available inputs on a microcontroller system
• Converting parallel peripheral data into a serial stream for controller processing
• Cascading multiple units to expand digital input capacity via a single serial line

Shift Registers Procurement Notes

Verify that the specific BQB suffix corresponds to the WQFN-16 package configuration required for your PCB layout. Confirm that the operating environment remains within the specified -40°C to +125°C thermal limits. Ensure power supply decoupling capacitors are placed physically close to the VCC and GND pins to maintain signal integrity during switching events.

Shift Registers Selection Notes

Select this component when noisy environments require the hysteresis provided by Schmitt-trigger inputs. It is suitable for designs needing wide voltage flexibility between 2 V and 6 V. Consider the WQFN-16 footprint constraints and ensure adequate thermal management if driving heavy loads near the absolute maximum ratings.

Shift Registers Part Context

This part belongs to the SN74HCS165 series of 8-bit shift registers. The HCS designation indicates High-Speed CMOS technology optimized for low power consumption while maintaining robust performance. The BQB suffix specifically identifies the WQFN (Wide Quad Flat No-leads) package variant, distinguishing it from SOIC or TSSOP versions within the same logical family.

Shift Registers Replacement Considerations

SN74HCS165DYYRQ1

Shift Registers FAQ

How does the SH/LD pin control data entry?

When the SH/LD pin is held low, the device asynchronously loads data from the parallel A-H inputs. When held high, the device shifts data serially on the rising edge of the clock pulse.

What is the function of the CLK INH pin?

The Clock Inhibit (CLK INH) pin prevents the internal registers from shifting when held high. It can be used interchangeably with the CLK pin to control data movement.