DM74ALS645AWM

Overview

The DM74ALS645AWM is an octal bus transceiver manufactured by onsemi, utilizing the Advanced Oxide-isolated Ion-implanted Schottky TTL process. It supports asynchronous two-way communication between data busses with a supply voltage range of 4.5V to 5.5V. The device features 3-state outputs and operates within a temperature range of 0°C to +70°C. Propagation delay times are specified at 31ns maximum for both LOW-to-HIGH and HIGH-to-LOW transitions under standard test conditions.

Feature Summary

• Supports asynchronous two-way communication between data busses
• Direction control input determines data flow direction
• Enable input isolates busses when disabled
• PNP input design reduces input loading

Applications

• Asynchronous two-way communication between data busses
• Bus-oriented memory and logic systems
• Data acquisition and transfer applications

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package type matches M20B (SOIC-20) specifications. Check RoHS compliance status as indicated in official documentation. Ensure storage and handling procedures meet ESD protection standards. Review datasheet revisions for any updates to electrical characteristics or ordering information.

Selection Notes

Select this component for applications requiring bidirectional data transfer with high-speed performance. Consider the 31ns propagation delay for timing-sensitive designs. Evaluate power consumption requirements against the specified supply current values. Verify compatibility with system voltage levels and input/output drive capabilities. Assess thermal management needs based on the package's thermal resistance characteristics.

Part Context

This device belongs to the 74ALS series of logic integrated circuits, designed for high-speed digital applications. The octal configuration provides eight independent bidirectional channels within a single package. The SOIC-20 package offers surface-mount convenience while maintaining compatibility with standard logic families. This component represents a solution for complex bus architectures requiring reliable data transmission.

Replacement Considerations

DM74ALS645AN: Alternative PDIP-20 package version from the same product line.