SN74ALS640B-1DWR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS640B-1DWR is an octal bus transceiver from the Texas Instruments SN54/74(ALS,AS)640(B) series. It features eight independent bidirectional data paths with three-state outputs and inverting logic polarity. The device operates within a supply voltage range of 4.5 V to 5.5 V. It utilizes a 20-pin SOIC surface-mount package and supports TTL input levels with TTL output levels. Key electrical characteristics include a propagation delay of 11 ns, a low-level output current of 24 mA, and a high-level output current of -15 mA. The component functions reliably across an operating temperature range of 0°C to +70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides eight independent bidirectional data paths for efficient bus management
• Features three-state outputs to facilitate direct connection to system buses
• Supports TTL-compatible input and output signal levels

Buffers, Drivers, Receivers, Transceivers Applications

• Memory module data buffering
• Clock drivers
• Bus-oriented architectures

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify that the specific suffix 'B-1' corresponds to the intended speed grade or variant requirements for your design. Confirm the package type matches your PCB footprint specifications. Ensure the operating temperature range aligns with your environmental constraints. Cross-reference the manufacturer datasheet for detailed pinout and electrical limits before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when high-speed performance is required alongside standard TTL compatibility. The ALS series offers faster switching speeds compared to standard LS logic while maintaining lower power consumption than AS variants. Consider the 24 mA drive capability for driving multiple loads on the bus. Evaluate the 11 ns propagation delay against your system timing requirements to ensure signal integrity.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the widely used 74-series logic family, specifically the Advanced Low-Power Schottky (ALS) subset. It serves as a critical interface component in digital systems requiring reliable data transfer between registers and memory. The SN74ALS640B-1DWR represents a surface-mount evolution of through-hole DIP versions, facilitating automated assembly in modern electronics manufacturing.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Compatible substitutes include SN74ALS640BDWR and SN74ALS640BNE4. Verify pinout compatibility and electrical parameters before substitution.