SN74HCT165QPWRQ1

Shift Registers Overview

The SN74HCT165QPWRQ1 is an automotive-grade, 8-bit parallel-load shift register manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports temperatures from -40°C to +125°C. The device features TTL-compatible inputs with VIH(min) at 2 V and VIL(max) at 0.8 V. It provides balanced CMOS push-pull outputs capable of driving up to 10 LSTTL loads. Key timing parameters include a maximum clock frequency of 31 MHz at 4.5 V and propagation delays ranging from 35 ns to 60 ns depending on the input source.

Shift Registers Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD protection levels.
• LSTTL input logic compatibility allowing direct interfacing with standard TTL devices.
• Asynchronous parallel load capability enabled by low-level control on the SH/LD pin.
• Balanced CMOS push-pull output structure providing comparable sourcing and sinking current capabilities.

Shift Registers Applications

• Increasing the number of available inputs for microcontrollers in embedded systems.
• Cascading multiple units to expand data input capacity while maintaining single serial controller interfaces.
• Parallel-to-serial conversion tasks within automotive electronic control units.

Shift Registers Procurement Notes

Verify that the specific ordering suffix matches the required package type and tape-and-reel specifications. Confirm AEC-Q100 qualification status is maintained for the intended automotive application environment. Ensure supply voltage constraints between 4.5 V and 5.5 V are strictly adhered to during system design validation.

Shift Registers Selection Notes

Select this component when TTL-compatible logic levels are required for input signals. Choose this part for designs needing asynchronous parallel loading alongside serial shifting capabilities. Consider the thermal resistance metrics if operating near the upper temperature limits or under high capacitive loads exceeding typical values.

Shift Registers Part Context

This device belongs to the SN74HCT165-Q1 family of automotive shift registers. It shares functional similarities with other parallel-load shift registers but is distinguished by its HCT logic family characteristics and specific automotive reliability certifications. It serves as a bridge between parallel peripheral data and serial microcontroller processing requirements.

Shift Registers Replacement Considerations

SN74HCT165PW-Q1

Shift Registers FAQ

How does the SH/LD input control data loading?

When the SH/LD input is held low, the internal registers asynchronously load data from the parallel inputs A through H. When held high, the device shifts data on the rising edge of the clock pulse.

What is the function of the CLK INH input?

The CLK INH input acts as a clock inhibit signal. Holding it high prevents clock pulses from being detected, effectively pausing the shifting operation regardless of the state of the primary CLK input.