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Appendix B – Product Approvals, Design Considerations, Regulatory Information
SocketModem Global MT5634SMI Developer’s Guide 83
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.