SN74HCS264QDRQ1

Shift Registers Overview

The SN74HCS264QDRQ1 is an automotive-grade, 8-bit parallel-out serial shift register featuring Schmitt-trigger inputs and inverted outputs. It operates within a supply voltage range of 2 V to 6 V and supports temperatures from -40°C to +125°C. The device utilizes AND-gated serial inputs (A and B) with an asynchronous clear function. Data propagates on the rising edge of the clock signal. It provides balanced CMOS push-pull outputs capable of ±7.8 mA drive current at 6 V.

Shift Registers Feature Summary

• Schmitt-trigger inputs provide noise margin and eliminate input transition rate requirements for slow or noisy signals.
• AND-gated serial architecture requires both inputs A and B to be high to set the data line high.
• Balanced CMOS push-pull outputs ensure similar sourcing and sinking capabilities.
• Asynchronous clear input immediately sets all internal storage registers to a logical low value.

Shift Registers Applications

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

Shift Registers Procurement Notes

Verify the specific ordering suffix matches the required package type, as the SN74HCS264-Q1 family includes multiple options such as TSSOP and SOIC. Confirm that the QDRQ1 designation aligns with your manufacturing assembly requirements. Ensure the component meets AEC-Q100 Grade 1 specifications for your target automotive environment. Review the datasheet for absolute maximum ratings to prevent damage during handling and operation.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with inverted outputs and Schmitt-trigger inputs is required for automotive systems. The AND-gated serial input design simplifies logic control by requiring two inputs to activate the data line. Consider the wide operating voltage range of 2 V to 6 V for compatibility with various power rails. Verify that the SOIC-16 package fits your PCB layout constraints and thermal management needs.

Shift Registers Part Context

This device belongs to the SN74HCS-Q1 family of automotive HCMOS logic components. It shares the HCS series characteristics, including Schmitt-trigger inputs and low power consumption. The part is designed for robust performance in electrically noisy automotive environments. It complements other logic gates and drivers within the same automotive qualification standard.

Shift Registers Replacement Considerations

Check for SN74HCS264PW-Q1 if a TSSOP package is preferred over the SOIC format. Verify functional equivalence regarding the inverted output state and AND-gated serial inputs before substitution.

Shift Registers FAQ

How does the AND-gated serial input affect data entry?

Data is only accepted into the first stage of the shift register when both serial inputs A and B are high. If either input is low, the first stage stores a low value.

What is the behavior of the outputs relative to the stored data?

All outputs are inverted from the data stored in the respective registers. For example, if a register stores a high value, the corresponding output will be low.

Can the serial inputs be changed while the clock is active?

Yes, data at the serial inputs can be changed while CLK is high or low, provided the minimum setup time requirements are met before the rising clock edge.