SN74ALS164ADR

Shift Registers Overview

The SN74ALS164ADR is an 8-bit parallel-out serial 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 50 MHz. The device features AND-gated serial inputs (A and B) and an asynchronous clear input. Propagation delays are specified at a maximum of 20 ns for clear-to-output and 17 ns for clock-to-output transitions under standard load conditions.

Shift Registers Feature Summary

• Features AND-gated serial inputs that allow control over incoming data entry by inhibiting new data when either input is low.
• Includes an asynchronous direct clear function that resets all flip-flops to a low level independently of the clock signal.
• Provides fully buffered clock and serial inputs with diode clamping to minimize transmission-line effects.

Shift Registers Applications

• Serial-to-parallel data conversion in digital communication systems
• Parallel output expansion for microprocessor interfaces
• Control logic sequencing in industrial automation equipment

Shift Registers Procurement Notes

Verify the specific ordering suffix 'R' indicates tape-and-reel packaging containing 2500 units per reel, distinct from tube-packaged variants. Confirm RoHS compliance status and lead finish specifications via the latest Package Option Addendum. Ensure the component status is reviewed as production-active or obsolete depending on current inventory availability.

Shift Registers Selection Notes

Select this component for applications requiring high-speed serial shifting with precise data gating capabilities. The ALS series offers faster switching speeds compared to standard LS logic while maintaining compatible pinouts. Verify that the operating temperature range of 0°C to 70°C aligns with the environmental requirements of the target system design.

Shift Registers Part Context

This part belongs to the SN74ALS164A family of 8-bit shift registers manufactured by Texas Instruments. The 'D' package designation refers to the plastic small-outline integrated circuit format, while the 'R' suffix specifically denotes the tape-and-reel carrier configuration used for automated surface-mount assembly processes.

Shift Registers Replacement Considerations

SN74ALS164AD (Tube Packaging)

Shift Registers FAQ

How does the AND-gated serial input function?

The serial inputs A and B are AND-gated, meaning a low level at either input inhibits the entry of new data and resets the first flip-flop to low upon the next clock pulse. Both inputs must be high to enable data transfer.

What is the behavior of the asynchronous clear input?

When the clear input is held low, it asynchronously resets all eight flip-flops to a low state regardless of the clock signal or serial input states. This action occurs immediately without waiting for a clock transition.