MC74ACT640DWR2G

Overview

The MC74ACT640DWR2G is an octal bus transceiver from the onsemi ACT logic family, housed in a 20-pin SOIC package. It features inverted polarity with TTL-compatible inputs and CMOS outputs. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range of -40 °C to +85 °C. Key electrical parameters include a maximum propagation delay of 9 ns at 50 pF load, a maximum high-level output current of -24 mA, and a maximum low-level output current of 24 mA.

Feature Summary

• Octal configuration providing eight independent bidirectional data paths for parallel bus interfacing.
• TTL-compatible input levels ensure direct interface with standard logic families without additional level shifting.
• CMOS output structure delivers robust drive capability suitable for driving multiple loads on system buses.

Applications

• Parallel data transmission between microprocessors and peripheral devices.
• Bus-oriented memory and I/O mapping systems.
• Clock drivers and buffer applications requiring inversion.

Procurement Notes

Verify the complete part number including the suffix DWR2G to confirm the specific tape-and-reel packaging and lead-free status. Confirm that the procurement source provides official datasheets matching the MC74ACT640 specification. Ensure compatibility with the required 4.5V to 5.5V power supply rails during design validation.

Selection Notes

Select this component when an octal, inverted bus transceiver is required for 5V logic systems. The ACT series offers faster switching speeds compared to standard HC or HCT counterparts. Verify that the 20-pin SOIC footprint fits the PCB layout constraints and that the 24mA output drive current meets the fan-out requirements of the connected loads.

Part Context

This device belongs to the MC74ACT series of advanced CMOS logic products by onsemi. The ACT series combines the speed of AC logic with the noise immunity and low power consumption of ACX technology. It is designed for high-performance digital applications requiring reliable data transfer across system buses.

Replacement Considerations

Check for pin-compatible alternatives such as the MC74ACT245 for non-inverting operation. Verify if the MC74ACT16245 is suitable for dual-supply bus applications. Ensure any substitute maintains the same 20-pin SOIC package and ACT logic family characteristics.