>
> On 1 Dec 2005, at 21:49, Harold Hallikainen wrote:
>
>> 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?
>
> Cheers
>
> Ed


Well... I THOUGHT there were graphs in the datasheet showing source/sink
current versus supply voltage, but I sure can't find them. However, I've
had to add drive transistors to drive LEDs (digit select on 7 segment) on
3V systems while I did not on 5V systems. It also makes sense, since
there's not as much gate voltage on the FETs when the supply voltage is
not as high. But, I think you're right about it being on the datasheet (I
can't find it!).

Harold



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