SN74HC166DBR

Shift Registers Overview

The SN74HC166DBR is an 8-bit parallel-load shift register from the Texas Instruments HC logic family. It operates within a supply voltage range of 2V to 6V and supports a maximum clock frequency of 25MHz at 6V. The device features synchronous loading, serial-to-serial shifting, and an asynchronous clear input. It utilizes a 16-pin SSOP package with a body size of 6.20mm by 5.30mm. Typical propagation delay is 13ns, with a maximum static supply current of 160μA.

Shift Registers Feature Summary

• Synchronous parallel data loading capability controlled by the SH/LD input pin
• Asynchronous direct overriding clear function that resets all flip-flops immediately
• Gated clock inputs allowing flexible control via CLK and CLK INH pins

Shift Registers Applications

• Increasing the number of inputs available to a microcontroller
• Parallel-to-serial data conversion for communication systems
• General-purpose digital logic shifting operations

Shift Registers Procurement Notes

Verify the specific ordering suffix against the latest TI Package Option Addendum to confirm material type, lead finish, and moisture sensitivity level. Ensure the selected variant matches the required operating temperature range and RoHS compliance status for your manufacturing process.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with synchronous load functionality is required. The HC series offers standard CMOS inputs compatible with TTL loads. Consider the SSOP package dimensions if board space is constrained compared to SOIC or PDIP options.

Shift Registers Part Context

This part belongs to the SNx4HC166 family of 8-bit parallel-load shift registers. The 'DB' suffix specifically denotes the 16-pin Shrink Small Outline Package (SSOP). Other variants in the family include SOIC, PDIP, and TSSOP packages, offering flexibility for different mounting requirements.

Shift Registers Replacement Considerations

SN74HC166DRG4

Shift Registers FAQ

How does the SH/LD input determine the operating mode?

When SH/LD is low, the device performs synchronous parallel loading on the next clock pulse. When SH/LD is high, the device shifts data serially from the SER input.

What is the function of the CLR input?

The CLR input provides an asynchronous clear function. It overrides all other inputs, including the clock, and resets all internal flip-flops to zero regardless of the clock state.