SN74ALS642A-1DB

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS642A-1DB is an octal bus transceiver in a 20-pin Small Outline (DW) package. It provides asynchronous two-way communication between data buses with inverting logic. The -1 suffix indicates an increased recommended maximum low-level output current of 48 mA, applicable when VCC is between 4.75 V and 5.25 V. Operating voltage ranges from 4.5 V to 5.5 V. Propagation delay from A or B to the opposite bus is 10 ns to 30 ns.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bidirectional bus transceiver for asynchronous two-way communication
• Inverting logic configuration
• Increased low-level output current capability in -1 versions

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous two-way communication between data buses
• Bus-oriented architectures requiring isolation
• Memory and memory mapping circuits

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package type and electrical characteristics. Confirm that the -1 designation aligns with the need for the higher 48 mA low-level output current rating under specified voltage conditions. Ensure the component status is checked against current production availability as some variants may be obsolete.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this device when inverting octal bus transfer is required with enhanced drive strength. The -1 version specifically supports higher sink currents compared to standard variants. Consider the SOIC-20 package dimensions for board layout constraints. Verify compatibility with system voltage levels and temperature requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This component belongs to the Texas Instruments SN74ALS642A family of high-speed ALS logic bus transceivers. It is part of a series offering both true and inverting logic options in various packages. The DW suffix denotes the plastic small-outline package format suitable for surface-mount applications.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS642A-1DW

Buffers, Drivers, Receivers, Transceivers FAQ

What is the functional difference between the SN74ALS642A and SN74ALS641A?

The SN74ALS642A provides inverting logic, whereas the SN74ALS641A provides true (non-inverting) logic.

How does the -1 suffix affect the electrical characteristics?

The -1 versions have an increased recommended maximum low-level output current (IOL) of 48 mA, provided VCC is between 4.75 V and 5.25 V.