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Input resistors on 5V-tolerant I/O

Question asked by fraccaroli.francesco on Feb 25, 2016
Latest reply on Mar 3, 2016 by fraccaroli.francesco
Hi,
I'm quite confused about 5V-tolerant input pins of STM32F405. Referring to the manual, the picture "Basic structure of a five-volt tolerant I/O port bit" shows diodes that protect the port. In this configuration, are external resistor needed?
In my application I connect some 5V logic port (like 74HCT245) directly to this pins. Must I connect them with a current imiting resistors to protect the processor, or the input pins accept 5V without them?

Thanks

Francesco

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