74HC166D/AUJ

Shift Registers Overview

The 74HC166D/AUJ is an 8-bit parallel-in/serial-out shift register manufactured by Nexperia. It operates within a supply voltage range of 2.0 V to 6.0 V and supports temperatures from -40 °C to +125 °C. The device features a serial data input (DS), eight parallel data inputs (D0-D7), and a serial output (Q7). Key control inputs include parallel enable (PE), clock enable (CE), asynchronous master reset (MR), and positive-edge-triggered clock (CP). Propagation delay from CP to Q7 is typically 50 ns at 2.0 V, reducing to 14 ns at 6.0 V.

Shift Registers Feature Summary

• Supports synchronous parallel-to-serial loading and serial expansion via dedicated control pins.
• Includes clamp diodes on inputs to allow interfacing with voltages exceeding VCC using current limiting resistors.
• Provides high noise immunity and low power dissipation characteristics typical of CMOS technology.

Shift Registers Applications

• Synchronous parallel-to-serial conversion for data transmission systems.
• Serial data expansion in digital logic circuits requiring additional input lines.
• General-purpose shift register applications in industrial control environments.

Shift Registers Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature grade. Confirm that the component meets all required JEDEC standards and ESD protection levels specified in the datasheet before finalizing procurement specifications.

Shift Registers Selection Notes

Select this component when an 8-bit parallel-in/serial-out configuration is required with wide voltage compatibility. Ensure the design accommodates the specified propagation delays and maximum operating frequencies for the target supply voltage. Verify that the SOIC-16 package dimensions fit the available PCB footprint constraints.

Shift Registers Part Context

This part belongs to the 74HC family of high-speed CMOS logic devices. It serves as a standard solution for shifting data in digital systems where parallel inputs must be converted to a serial stream. The device is distinct from counters or multiplexers within the broader logic IC category.

Shift Registers Replacement Considerations

The 74HCT166D/AUJ is a compatible alternative offering TTL-level input compatibility while maintaining the same functional pinout and performance characteristics within the 4.5 V to 5.5 V supply range.