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Voltage from external device on pin of STM32F205 even if vdd is off

Question asked by A2 on Sep 19, 2013
Latest reply on Sep 19, 2013 by John F.
I am connecting a external terminal device which communicate with STM32f2. Sometimes device is shut off which remove poer from stm32 but termial device remained powered which gives high 3.3V on device, will it damage the mcu of mcu can tolerate 3.3v even if vdd is not present