SN74ALS166N

Shift Registers Overview

The SN74ALS166N is a parallel-load 8-bit shift register from the Texas Instruments ALS logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and supports clock frequencies up to 45 MHz. The device features buffered inputs, input clamping diodes, and an overriding clear function. It utilizes a 16-pin PDIP package and is characterized for operation between 0°C and 70°C.

Shift Registers Feature Summary

• Supports synchronous parallel loading and serial shifting operations via dedicated control inputs.
• Features gated clock functionality allowing independent clock enable or inhibit control.
• Includes direct overriding clear to reset all flip-flops regardless of other active signals.

Shift Registers Applications

• Parallel-to-serial data conversion
• Serial-in/parallel-out data routing
• General-purpose digital shift registers

Shift Registers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current Package Option Addendum to confirm the exact physical package type (e.g., N for PDIP, D for SOIC) and production status. Ensure the component meets the required operating temperature range and electrical specifications for your application environment before finalizing procurement.

Shift Registers Selection Notes

Select this component when a low-power Schottky TTL compatible shift register with parallel load capability is required. Consider the 16-pin PDIP package for through-hole mounting needs. Verify that the system design accommodates the buffered input requirements and the specific timing constraints associated with the ALS logic family.

Shift Registers Part Context

This part belongs to the SN74ALS166 series of parallel-load 8-bit shift registers manufactured by Texas Instruments. The 'N' suffix specifically denotes the standard plastic dual in-line package variant. It is designed for compatibility with most other TTL logic families while offering lower power consumption compared to standard LS devices.

Shift Registers Replacement Considerations

SN74ALS166D

Shift Registers FAQ

How does the SH/LD input control the data mode?

When SH/LD is high, the register enables serial data input for shifting. When SH/LD is low, parallel data inputs are enabled for synchronous loading on the next clock pulse.

What is the function of the CLK INH input?

The CLK INH input acts as a clock inhibit. Holding either the CLK or CLK INH input high inhibits clocking, allowing the system clock to be stopped on command while free-running.