SN74ALS166NSR

Shift Registers Overview

The SN74ALS166NSR is a parallel-load 8-bit shift register from the Texas Instruments ALS logic family, housed in a 16-pin SOP package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of 0°C to 70°C. The device features a maximum clock frequency of 45 MHz, with propagation delays ranging from 2 ns to 14 ns depending on the input-to-output path. It provides a low-level output current of 8 mA and includes buffered inputs with clamping diodes.

Shift Registers Feature Summary

• Supports synchronous parallel loading and serial shifting operations controlled by dedicated mode selection inputs.
• Features gated clock functionality allowing independent control over clock enable and inhibit states via separate inputs.
• Includes a direct overriding clear input that forces all flip-flops to zero regardless of other active signals.

Shift Registers Applications

• Parallel-to-serial data conversion circuits
• Serial-in or parallel-in serial-out register configurations
• System timing and synchronization logic

Shift Registers Procurement Notes

Verify the specific ordering suffix 'SR' corresponds to the SOP (NS) package variant containing 2000 units per reel. Confirm RoHS compliance status and lead finish details against the latest manufacturer packaging addendum prior to finalizing procurement specifications.

Shift Registers Selection Notes

Select this component for applications requiring high-speed serial data handling within standard TTL-compatible environments. Ensure the design accommodates the required 4.5 V to 5.5 V power supply constraints and verify that the 16-pin SOP footprint aligns with the target PCB layout requirements.

Shift Registers Part Context

This part belongs to the SN74ALS166 series of parallel-load 8-bit shift registers manufactured by Texas Instruments. It is designed for compatibility with various TTL logic families and utilizes bipolar technology to achieve performance characteristics suitable for general-purpose digital logic applications.

Shift Registers Replacement Considerations

SN74ALS166DR

Shift Registers FAQ

How is the shift/load mode determined?

The shift/load (SH/LD) input determines the mode; when high, it enables serial data flow, and when low, it enables synchronous parallel loading on the next clock pulse.

What is the function of the CLK INH input?

The CLK INH input acts as a clock inhibit signal; holding it high prevents clocking, while holding it low allows the primary clock input to function.