> > Of
> > course at 3.3V, you can't get the 25mA you can get at 5V, but
> > that's not
> > the USART's problem.
> 
> Eh!?  Where does it say that on the datasheet!?  
> Why of course?

Because the output device is a FET, AKA a resistor.

Output current into any resistive load will always be lower, with lower
VCC.



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