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5V TTL input

Question asked by Tom on Jun 13, 2013
Latest reply on Jun 13, 2013 by Clive One

I'm using a stm32f4 discovery board. The data sheet says that my pins are 5V restistant. 
I have a device that outputs 5V ttl and I want to read this signal. It works, but does it reduce the lifetime of the processor? Can it simply break down because of this?

// Tom