Technics MT5634SMI-92 Manuel D’Utilisation
Appendix B – Product Approvals, Design Considerations, Regulatory Information
SocketModem Global MT5634SMI Developer’s Guide
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5V Tolerant Inputs for 3.3V Modules
In order to drive the inputs of 3.3V modules from 5V logic, it is recommended to add a 1K series resistor to each
of the inputs: TXD, RTS, DTR, and RESET.
of the inputs: TXD, RTS, DTR, and RESET.