MC74ACT640DWG

Overview

The MC74ACT640DWG is an octal bus transceiver from the onsemi 74ACT logic family, housed in a 20-pin SOIC package. It operates within a supply voltage range of 4.5 V to 5.5 V and supports bidirectional data transfer between two 8-bit ports. The device features inverted outputs and includes common output enable and direction control inputs. It delivers high drive capability with maximum output currents of ±24 mA. Propagation delay is specified at 18.5 ns under a 50 pF load condition. The component functions reliably across an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• Provides bidirectional data transmission for eight bits simultaneously
• Features inverted logic polarity for signal processing applications
• Integrates common control inputs for direction selection and output enabling
• Delivers strong CMOS drive current suitable for bus line driving

Applications

• Memory module data bus interfacing
• Microprocessor system address and data routing
• Control signal distribution in embedded systems

Procurement Notes

Verify the specific suffix against official datasheets to confirm package dimensions and lead-free status. Confirm moisture sensitivity level requirements for surface mount assembly processes. Ensure the ordering code matches the exact pinout and electrical specifications required by the design. Cross-reference with manufacturer documentation to validate compliance with current environmental directives.

Selection Notes

Select this component when an octal transceiver with inverted logic is required for 5V CMOS systems. The ACT series offers faster switching speeds compared to standard HC or HCT families while maintaining compatible voltage levels. Consider the 20-pin SOIC footprint for PCB layout constraints. Evaluate the ±24 mA drive strength against the capacitive load of the connected bus lines to ensure signal integrity.

Part Context

This part belongs to the 74ACT series of advanced CMOS logic devices manufactured by onsemi. The series is designed to bridge the performance gap between older TTL logic and modern low-voltage CMOS technologies. These components are widely used in digital communication interfaces and memory architectures where reliable high-speed data transfer is essential.

Replacement Considerations

MC74ACT640DWR2: Pin-compatible alternative available in tape-and-reel packaging.