SN74HC166DRE4

Shift Registers Overview

The SN74HC166DRE4 is an 8-bit parallel-load shift register from the Texas Instruments HC logic family, housed in a 16-pin SOIC package. It operates on a supply voltage range of 2V to 6V and supports a recommended operating temperature range of -55°C to 125°C. The device features synchronous loading via the SH/LD input and serial shifting triggered by the rising edge of the clock signal. It includes a direct overriding clear (CLR) input that resets all flip-flops asynchronously. The component provides push-pull outputs capable of driving up to 10 LSTTL loads with ±4mA drive current at 5V.

Shift Registers Feature Summary

• Synchronous parallel data loading capability controlled by the SH/LD input pin
• Asynchronous clear function that overrides all other inputs to reset internal registers
• Gated clock architecture utilizing separate CLK and CLK INH pins for flexible timing control

Shift Registers Applications

• Expanding microcontroller input capacity through parallel-to-serial conversion
• Interfacing peripheral devices requiring simple GPIO-based control without communication interfaces
• System initialization by establishing defined zero states upon power-up

Shift Registers Procurement Notes

Verify the specific ordering suffix 'E4' against the manufacturer's official documentation to confirm material composition and environmental compliance status. Ensure the selected package variant matches the required PCB footprint dimensions and thermal characteristics for the intended application environment.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with synchronous parallel load and asynchronous clear functionality is required. The HC series offers standard CMOS inputs compatible with TTL logic levels. Consider the wide operating temperature range and push-pull output drive capabilities for robust system integration.

Shift Registers Part Context

This device belongs to the SNx4HC166 family of 8-bit parallel-load shift registers manufactured by Texas Instruments. The family encompasses various package options including SOIC, SSOP, PDIP, and TSSOP. The SN74HC166DRE4 specifically denotes the commercial grade version in a 16-pin SOIC surface-mount package.

Shift Registers Replacement Considerations

SN74HC166DR