74HCT166N,652

Shift Registers Overview

The 74HCT166N,652 is an 8-bit parallel-in/serial-out shift register manufactured by NXP USA Inc. It operates within a supply voltage range of 4.5 V to 5.5 V and features TTL-level inputs compatible with standard logic families. The device includes eight parallel data inputs (D0 to D7), a serial data input (DS), and a single serial output (Q7). Control functions are managed via a clock enable (CE) pin, a parallel enable (PE) pin, and an asynchronous master reset (MR) pin. Data shifts occur on the LOW-to-HIGH transition of the clock signal when CE is active. The component is housed in a 16-lead plastic dual in-line package (PDIP-16) designed for through-hole mounting.

Shift Registers Feature Summary

• Supports synchronous parallel loading and serial shifting operations
• Includes an asynchronous master reset function for immediate clearing
• Features input clamp diodes for interfacing with voltages exceeding VCC

Shift Registers Applications

• Synchronous parallel-to-serial data conversion
• Serial data expansion in digital systems
• Shift register chains for extended I/O capabilities

Shift Registers Procurement Notes

Verify the specific ordering suffix against current Nexperia documentation to confirm package type and temperature range specifications. Confirm that the DIP16 variant matches the required mechanical footprint for the target PCB layout. Ensure compatibility with the system's operating voltage requirements before finalizing procurement decisions.

Shift Registers Selection Notes

Select this component when TTL-compatible inputs are required for an 8-bit shift register application. The HCT series ensures direct interface with standard TTL logic outputs without additional level shifting. Consider the PDIP-16 package constraints regarding board space and thermal dissipation limits during the design phase.

Shift Registers Part Context

This part belongs to the 74HCT166 family of 8-bit shift registers. It shares functional similarities with the 74HC166 but utilizes HCT logic levels for broader compatibility with legacy TTL systems. The NXP Semiconductors portfolio provides multiple package options for this architecture, including SO and SSOP variants.

Shift Registers Replacement Considerations

Cross-reference with other manufacturers offering 74HCT166 equivalents. Verify pinout compatibility and electrical characteristics such as propagation delay and drive strength before substituting.