SN74ALS639ADWR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS639ADWR is an octal transparent latch manufactured by Texas Instruments, belonging to the ALS logic family. It features eight D-type latches with inverting outputs and includes a dedicated strobe input for data capture. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports a low-level output current of 24 mA. It is housed in a 20-pin SOIC package and functions reliably across an industrial temperature range from -40°C to +85°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides eight independent transparent latches for parallel data storage applications
• Features inverting outputs suitable for signal inversion during data transfer
• Supports high-drive capability with a low-level output current of 24 mA

Buffers, Drivers, Receivers, Transceivers Applications

• Parallel data storage in digital systems
• Bus interface circuits requiring temporary data holding
• High-speed data acquisition systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'DWR' confirms the SOIC-20 package and tape-and-reel delivery format. Confirm the ALS logic family designation matches system requirements for speed and power consumption. Ensure the operating temperature range aligns with the intended environmental conditions. Cross-reference the manufacturer part number against official datasheets to validate pinout compatibility.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal latch with inverting outputs is required for bus interfacing or data storage. The ALS family offers a balance between propagation delay and power dissipation compared to standard TTL. Consider the 24 mA sink capability for driving moderate loads directly without additional buffering stages.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments SN74ALS series, which utilizes advanced small-signal bipolar technology. The series is designed to replace older LS logic devices while offering improved speed and lower power consumption. The octal latch configuration allows for efficient management of multiple data lines in complex digital architectures.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Compatible substitutes include the SN74ALS639APW (TSSOP-20 package) or SN74ALS639N (PDIP-20 package). Verify that alternative packages maintain identical electrical characteristics and pin configurations for direct replacement.