SN74LVC165APWRQ1

Shift Registers Overview

The SN74LVC165APWRQ1 is an automotive-grade, 8-bit parallel-load shift register from Texas Instruments. It operates within a supply voltage range of 1.1V to 3.6V and supports over-voltage tolerant inputs up to 5.5V independent of VCC. The device features high push-pull output drive strength, reaching ±24mA at 3.3V, and includes Schmitt-trigger inputs for improved noise immunity. It is qualified under AEC-Q100 standards with a temperature grade of 1, supporting operation from -40°C to +125°C.

Shift Registers Feature Summary

• AEC-Q100 qualified for automotive applications with extended temperature support
• Asynchronous parallel loading via dedicated SH/LD select pin
• Over-voltage tolerant inputs allowing compatibility with 5.5V signals
• Integrated partial-power-down protection with back drive capability

Shift Registers Applications

• Increasing the number of available inputs on a microcontroller
• Reading in board revision identifiers
• Serial data expansion in automotive electronic control units

Shift Registers Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the PW designation indicates TSSOP-16 packaging. Confirm the presence of the Q1 suffix ensures compliance with AEC-Q100 reliability standards necessary for automotive deployment. Ensure the component version aligns with current production data sheets to avoid discrepancies in electrical characteristics or pin configurations during integration.

Shift Registers Selection Notes

Select this component when designing systems requiring low-voltage operation down to 1.1V alongside robust noise immunity provided by Schmitt-trigger inputs. The device is suitable for applications needing to interface between 5.5V logic sources and lower voltage processors without external level shifting. Consider the push-pull output drive capabilities when determining load requirements for downstream circuitry.

Shift Registers Part Context

This part belongs to the SN74LVC165A-Q1 family of automotive shift registers manufactured by Texas Instruments. It shares functional similarities with other LVC series devices but is specifically optimized for automotive environments through rigorous qualification processes. The device provides a reliable solution for serial-to-parallel conversion tasks within constrained power and space envelopes typical of modern vehicle electronics.

Shift Registers Replacement Considerations

SN74HCS165QPWRQ1

Shift Registers FAQ

How does the device handle partial power-down scenarios?

The SN74LVC165APWRQ1 includes Ioff circuitry that disables all outputs when the supply pin is held at 0V, preventing back driving regardless of input voltages applied.

What is the function of the CLK INH pin?

The CLK INH pin serves as a clock inhibit input. Clocking occurs on a rising edge of the clock while CLK INH is held low, or alternatively, on a rising edge of CLK INH while the clock is held high.