AVR-Chat

>
> If the data rate isn't too fast and the latchup current of overdriven
> inputs is specified, you can use a single series resistor between output
> and input. Even if the latchup current isn't specified, you can still gain
> some confidence by abusing a chip with 10-20mA overdrive and see if it's
> tolerant.


Confidence in what, exactly?

If there isn't enough load to pull that current back out of the rail, you
end up raising the 3.3V rail out of spec.


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