Why we add pull up resistor if a 3.3V output signal is driven to 5V logic?

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vsrpkumar

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If a 3.3 V output signal is driven to 5V logic,we add pull up resistor .In this instance is this related to rise time of the signal.Then how it is.Kindly clarify this
 

Re: query

Can you describe your problem in detail? I didn't get anything of it!!!!
 

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