74HCT166D,652

Shift Registers Overview

The Nexperia 74HCT166D,652 is an 8-bit parallel-in/serial-out shift register in the HCT logic family. It features eight parallel data inputs (D0 to D7), a serial data input (DS), and a serial output (Q7). The device operates with a supply voltage range of 4.5 V to 5.5 V. It includes a synchronous parallel load capability triggered by the PE input and clock edge, as well as serial shifting controlled by CE and CP. An asynchronous master reset (MR) clears all stages. The component utilizes clamp diodes on inputs for overvoltage tolerance and is housed in a 16-lead SO plastic small outline package (SOT109-1).

Shift Registers Feature Summary

• Supports synchronous parallel-to-serial conversion via dedicated parallel enable and clock inputs.
• Features TTL-compatible input levels suitable for interfacing with standard digital logic systems.
• Includes an asynchronous master reset function to clear internal states independently of the clock signal.

Shift Registers Applications

• Synchronous parallel-to-serial data conversion circuits
• Serial expansion interfaces for digital control systems
• Data acquisition systems requiring parallel input buffering

Shift Registers Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature range. Confirm that the HCT logic level compatibility aligns with the system's voltage standards. Ensure design compliance with absolute maximum ratings to prevent device damage during operation.

Shift Registers Selection Notes

Select this component when TTL-level interface compatibility is required alongside CMOS performance characteristics. The 74HCT166D variant is appropriate for designs needing an 8-bit shift register with synchronous parallel loading capabilities within standard industrial temperature ranges.

Shift Registers Part Context

This part belongs to the 74HC/HCT166 family of 8-bit parallel-in/serial-out shift registers. The 'HCT' designation indicates High-speed CMOS technology with TTL-compatible input thresholds, distinguishing it from the standard HC series which uses CMOS input levels. The 'D' suffix specifies the SO16 surface-mount package configuration.

Shift Registers Replacement Considerations

74HCT166PW,118