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NTB0104 concern about input voltage level

Question asked by Bob Peters on May 17, 2018
Latest reply on Jun 6, 2018 by G.w. Sun

I plan to connect VccB to a 3.3V power source.  There are instances where a 5.5V output device will be supplying the inputs to port B.  This creates an overdriven input on port B (since VccB is connected to a 3.3V source).  The data sheet does not supply a value for Vih (max) for PortB inputs.  Vi is specified in "Recommended operating conditions" as 5.5V max.  So, the question is:  Are the IO ports (port b in particular) considered as inputs that are capable of being driven to 5.5V when VccB is 3.3V?  thanks