SN74HCS594QDYYRQ1

Shift Registers Overview

The SN74HCS594QDYYRQ1 is an automotive-grade, 8-bit serial-in, parallel-out shift register with a D-type storage register. It operates within a supply voltage range of 2 V to 6 V and supports an ambient temperature range from -40°C to +125°C. The device features Schmitt-trigger inputs for noise rejection and provides balanced CMOS push-pull outputs capable of ±7.8 mA drive current at 6 V. It includes separate clocks for the shift and storage registers, direct overriding clear inputs, and a serial output for cascading.

Shift Registers Feature Summary

• AEC-Q100 qualified for automotive applications with specified temperature grades and ESD classifications.
• Schmitt-trigger inputs provide high noise immunity and tolerance for slow or noisy input signals.
• Balanced CMOS push-pull outputs ensure similar sourcing and sinking current capabilities.
• Available in SOT-23-THIN (DYY) package with wettable flank options for improved solder joint inspection.

Shift Registers Applications

• Output expansion
• LED matrix control
• 7-segment display control
• 8-bit data storage

Shift Registers Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the SN74HCS594-Q1 family includes multiple packages such as TSSOP, SOIC, WQFN, and SOT-23-THIN. Confirm the presence of wettable flanks if automatic optical inspection compatibility is required. Ensure the selected variant meets the specific thermal resistance requirements for your PCB layout design.

Shift Registers Selection Notes

Select this component when an automotive-compliant shift register with Schmitt-trigger inputs is needed. It is suitable for designs requiring wide voltage operation between 2 V and 6 V. Consider the SOT-23-THIN package for space-constrained applications. Verify that the load capacitance does not exceed 50 pF to maintain specified timing characteristics.

Shift Registers Part Context

This part belongs to the SN74HCS594-Q1 family of automotive 8-bit shift registers. The 'Q' indicates AEC-Q100 qualification, while 'DYY' specifies the SOT-23-THIN-16 package. The 'RQ1' suffix typically denotes reel packaging for automated assembly. It is part of Texas Instruments' High-Speed CMOS Logic series designed for robust performance in demanding environments.

Shift Registers Replacement Considerations

SN74HCS594PWQ1 (TSSOP package)

Shift Registers FAQ

How do the Schmitt-trigger inputs benefit signal integrity?

The Schmitt-trigger architecture provides hysteresis, making the device extremely tolerant to slow input transitions and noisy signals, thereby eliminating erroneous data outputs caused by signal degradation.

What is the function of the QH' pin?

QH' is the serial output pin that allows for cascading multiple devices. It enables the connection of additional shift registers to expand the number of available parallel outputs.