SN74ALS642A-1NE4

Buffers, Drivers, Receivers, Transceivers Overview

The SN74ALS642A-1NE4 is an octal bus transceiver in a 20-pin PDIP package. It supports asynchronous two-way communication between data buses with direction control (DIR) and output enable (OE). The -1 suffix indicates an increased recommended maximum low-level output current of 48 mA when VCC is between 4.75 V and 5.25 V. Operating voltage ranges from 4.5 V to 5.5 V, with a temperature range of 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Bidirectional octal bus transceiver for asynchronous two-way communication
• Direction control via DIR input determines data flow between A and B buses
• Output isolation capability through the OE input pin
• -1 version provides enhanced low-level output drive capability

Buffers, Drivers, Receivers, Transceivers Applications

• Asynchronous data bus communication interfaces
• Bidirectional data transfer between microprocessors and memory
• System bus buffering and isolation applications

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required package type and lead finish. Confirm the -1 designation is necessary for the intended load conditions. Check RoHS compliance status and moisture sensitivity level ratings before procurement. Ensure the supply voltage range aligns with system requirements.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component for designs requiring bidirectional octal data transfer with high drive capability. The -1 version is suitable for loads requiring up to 48 mA low-level current within the specified voltage window. Consider the PDIP package for through-hole mounting needs. Evaluate propagation delay characteristics against system timing constraints.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the Texas Instruments SN74ALS series of logic components. It shares functional similarities with the SN74ALS641A but differs in logic polarity. The ALS series offers improved speed-power product compared to standard TTL. The -1 variant specifically addresses higher current drive requirements for bus applications.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74ALS642A-1N serves as a direct equivalent without the E4 environmental suffix.