SN74AS640DW

Buffers, Drivers, Receivers, Transceivers Overview

The SN74AS640DW is an octal bus transceiver from the Texas Instruments AS logic series, housed in a 20-pin SOIC package. It features three-state outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides a maximum propagation delay of 6 ns at a capacitive load of 150 pF. Output drive capabilities include a low-level current of 32 mA and a high-level current of -15 mA. It functions as an inverting transceiver with a single element containing eight channels, suitable for surface-mount installation.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Provides bidirectional data transmission between two buses using eight independent channels.
• Features three-state outputs that isolate the bus when disabled.
• Delivers high-speed performance with a propagation delay of 6 ns.

Buffers, Drivers, Receivers, Transceivers Applications

• High-speed data acquisition systems
• Memory mapping applications
• Control loops in industrial automation

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'DW' corresponds to the SOIC-20 package configuration. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets. Ensure the operating temperature range meets system requirements, as standard versions typically support 0°C to +70°C. Cross-reference the manufacturer part number against current obsolescence notices to confirm availability.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring fast switching speeds and high drive currents compared to standard HC or LS families. The AS series offers superior performance but may require careful attention to power supply decoupling due to higher peak currents. Verify that the input voltage levels are compatible with the driving logic family used in the circuit design.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the SN54/74(AS)640(B) family of octal bus transceivers. It shares functional similarities with other members like the SN74ALS640 but utilizes Advanced Schottky technology for faster operation. The SN74AS640DW variant specifically denotes the plastic small-outline integrated circuit package format manufactured by Texas Instruments.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The SN74ALS640DW serves as a slower alternative within the same functional category. Other AS-series variants may offer different pinouts or electrical characteristics. Direct substitution requires verifying package compatibility and ensuring the replacement meets the required propagation delay specifications.