MC74ACT640DWR2

Overview

The MC74ACT640DWR2 is an octal bus transceiver from the onsemi ACT logic series, housed in a 20-pin SOIC package. It features inverted outputs and operates within a supply voltage range of 4.5 V to 5.5 V. The device provides high drive capability with maximum output currents of ±24 mA. Propagation delay is specified at 9 ns under a 50 pF load condition. It supports TTL input levels and CMOS output levels, functioning as a single eight-bit bidirectional transceiver.

Feature Summary

• Octal bidirectional data transfer capability with common direction control
• Inverted output polarity for signal inversion during transmission
• High-drive output stage supporting ±24 mA current loads
• Compatible with TTL input thresholds while delivering CMOS output levels

Applications

• Bidirectional data bus driving applications
• Memory-to-memory or memory-to-I/O data transfers
• Digital signal routing in systems requiring level translation between TTL and CMOS domains

Procurement Notes

Verify the specific suffix DWR2G against the requested part number, as the base model may denote different packaging or compliance standards. Confirm RoHS status and moisture sensitivity classification prior to integration. Ensure the SOIC-20 footprint matches the design layout. Check for any recent product change notices that might affect pinout or electrical characteristics.

Selection Notes

Select this component when an octal transceiver with inverted functionality is required for 5V logic systems. The ACT series offers faster switching speeds compared to standard 74LS equivalents. Verify that the 4.5V to 5.5V operating range aligns with the system power supply. Consider the 20-pin SOIC package constraints for PCB space and thermal management requirements.

Part Context

This device belongs to the 74ACT family of high-speed CMOS logic devices manufactured by onsemi. The ACT series is designed to replace slower TTL technologies while maintaining compatible input/output characteristics. The MC74ACT640 specifically serves as an octal buffer/transceiver, providing robust signal integrity for wide data buses in digital communication interfaces.

Replacement Considerations

MC74ACT640DWR2G is a verified equivalent variant with identical electrical specifications but potentially updated packaging or compliance markings.