SN74HC166D

Shift Registers Overview

The SN74HC166D is an 8-bit parallel-load shift register manufactured by Texas Instruments in a 16-pin SOIC package. It operates within a supply voltage range of 2V to 6V and supports an operating temperature from -55°C to 125°C. The device features synchronous loading, serial-to-serial shifting, and an asynchronous clear input. Typical propagation delay is 13ns at 5V, with outputs capable of driving up to 10 LSTTL loads.

Shift Registers Feature Summary

• Synchronous parallel data loading capability
• Asynchronous direct overriding clear function
• Gated clock inputs for flexible control

Shift Registers Applications

• Increasing microcontroller input/output capacity
• Parallel-to-serial data conversion
• General-purpose digital logic shifting

Shift Registers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and material specifications. Confirm that the component meets all required environmental standards and thermal characteristics for the intended application environment before finalizing procurement decisions.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with synchronous parallel load and asynchronous clear is required. Ensure the design accommodates the specified voltage range and temperature limits. Verify that the output drive capabilities meet the load requirements of the connected circuitry.

Shift Registers Part Context

This part belongs to the SNx4HC166 family of 8-bit parallel-load shift registers. It utilizes standard CMOS technology compatible with TTL logic levels. The device provides a reliable solution for expanding I/O lines or converting data formats in digital systems without requiring complex communication interfaces.

Shift Registers Replacement Considerations

SN74HC166DRG4

Shift Registers FAQ

How does the SH/LD input control the device operation?

When SH/LD is high, the device shifts serial data on the rising edge of the clock. When SH/LD is low, parallel data inputs are loaded synchronously with the next clock pulse.

What is the function of the CLR input?

The CLR input provides an asynchronous override that resets all flip-flops to zero, regardless of the clock or other input states.