M74HCT640RM13TR

Overview

The M74HCT640RM13TR is an octal bus transceiver with 3-state outputs manufactured by STMicroelectronics. It operates within a supply voltage range of 4.5V to 5.5V and supports bidirectional data transmission controlled by a DIR input, while the G input enables or disables the device. The component features high-speed performance with a typical propagation delay of 13ns at VCC = 4.5V and low power dissipation with a maximum quiescent current of 4μA. It provides symmetrical output impedance with minimum drive currents of 6mA for both high and low states. The device is housed in a 20-pin SOIC package.

Feature Summary

• Advanced high-speed CMOS technology fabricated with silicon gate C2MOS process
• Directional control via dedicated DIR input for asynchronous two-way communication
• Output enable/disable functionality through the G input for effective bus isolation
• Built-in protection circuits against static discharge and transient excess voltage on all inputs

Applications

• Two-way asynchronous communication between data buses
• Data bus buffering and direction control
• Bus isolation applications requiring 3-state outputs

Procurement Notes

Verify component authenticity and datasheet version before integration. Confirm that the SO-20 package dimensions match the design footprint. Check for RoHS compliance status as indicated in the documentation. Ensure handling procedures account for static discharge protection requirements specified for the inputs.

Selection Notes

Select this component when designing systems requiring octal wide bus interfacing with defined direction control. The HCT logic compatibility ensures direct interface with TTL-level signals without additional level shifting. Consider the 3-state output capability for shared bus architectures where multiple devices must share data lines effectively.

Part Context

This part belongs to the M74HCT640 series of octal bus transceivers. It is functionally compatible with the standard 74 Series 640 logic family. The RM13 suffix indicates the specific tape and reel packaging format for surface-mount assembly using the SO-20 package type.

Replacement Considerations

The datasheet identifies the DIP (M74HCT640B1R) and TSSOP (M74HCT640TTR) variants as obsolete products alongside the SOP version.