SN74ALS166DBR

Shift Registers Overview

The SN74ALS166DBR 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 is housed in a 16-pin Shrink Small-Outline (DB) package and is characterized for operation between 0°C and 70°C.

Shift Registers Feature Summary

• Supports both parallel-to-serial and serial-to-serial conversion modes via the SH/LD control input.
• Features gated clocks with separate CLK and CLK INH inputs for flexible system timing control.
• Includes an asynchronous CLR input that overrides all other signals to reset flip-flops.

Shift Registers Applications

• Parallel-to-serial data conversion circuits
• Serial-to-parallel data conversion systems
• Digital signal processing applications requiring high-speed shifting

Shift Registers Procurement Notes

Verify the active status and RoHS compliance of the SN74ALS166DBR through official Texas Instruments channels before procurement. Confirm the specific SSOP-16 tape and reel packaging details match your assembly requirements. Ensure the operating temperature range aligns with your environmental specifications.

Shift Registers Selection Notes

Select this component when a fast, low-power 8-bit shift register with parallel loading capability is required. The ALS series offers superior speed compared to standard TTL while maintaining lower power consumption. Verify compatibility with existing logic families and ensure the 16-pin SSOP footprint fits the PCB layout constraints.

Shift Registers Part Context

This part belongs to the SN74ALS166A family of parallel-load 8-bit shift registers. It is designed for high-speed digital applications where efficient data serialization or deserialization is necessary. The device integrates buffered inputs and clamping diodes to simplify system design and minimize switching transients.

Shift Registers Replacement Considerations

Check for direct substitutes such as the SN74ALS166DR or SN74ALS166N based on package preference. Verify functional equivalence regarding pinout and electrical characteristics before replacing the DB package variant.

Shift Registers FAQ

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

When SH/LD is high, the register accepts serial data at the SER input. When SH/LD is low, parallel data from inputs A through H is loaded synchronously on the next clock pulse.

What is the function of the CLK INH input?

The CLK INH input allows the system clock to be inhibited. Holding either the CLK or CLK INH input high prevents clocking, enabling the register to stop shifting on command.