SN74HCS596QDRQ1

Shift Registers Overview

The SN74HCS596QDRQ1 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 features Schmitt-trigger inputs for noise rejection. The device provides open-drain parallel outputs (QA-QH) requiring external pull-ups and a push-pull serial output (QH'). It includes separate clocks for the shift and storage registers, a direct overriding clear input, and an active-low output enable. Qualified under AEC-Q100 Grade 1, it supports temperatures from -40°C to +125°C.

Shift Registers Feature Summary

• Schmitt-trigger inputs provide low power noise rejection and support slow or noisy input signals.
• Open-drain parallel outputs allow flexible voltage translation and wired-AND configurations.
• Separate clocking architecture enables independent control of data shifting and storage operations.

Shift Registers Applications

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

Shift Registers Procurement Notes

Verify that the specific part number matches the required automotive qualification standards and package type. Confirm that the operating environment stays within the specified temperature and voltage limits. Ensure proper termination of unused inputs to prevent undefined states. Review absolute maximum ratings to avoid damage during system integration.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with high noise immunity is required for automotive systems. The open-drain outputs are suitable for interfacing with different logic voltage levels via pull-up resistors. Consider the separate clock lines if simultaneous shifting and latching is needed. Verify that the SOIC-16 package fits the PCB layout constraints.

Shift Registers Part Context

This device belongs to the Texas Instruments SN74HCS family, which utilizes CMOS technology with Schmitt-trigger inputs. The 'Q' suffix indicates automotive qualification, while 'D' specifies the SOIC-16 package. It is designed for robust performance in electrically noisy environments common in automotive applications.

Shift Registers Replacement Considerations

Check for other SN74HCS596 variants with different packages like TSSOP if space is limited. Ensure any substitute maintains the same AEC-Q100 qualification and pinout compatibility.

Shift Registers FAQ

Why are the parallel outputs described as open-drain?

The open-drain design allows the outputs to sink current to ground but not source it from VCC. This requires an external pull-up resistor, enabling the outputs to operate at voltages higher than the device supply.

What is the function of the QH' pin?

QH' is a push-pull serial output used for cascading multiple devices. It allows data to be shifted out of the register chain without needing an external pull-up resistor.