It's because all the 'older' chips only sourced 20mA each pin and sunk
25mA, and so that's what I'm used to.

I'm glad to see that the 18f series is beefing up the sourcing current,
though.

-Adam

Mike Mansheim wrote:

>>Not only that, but it can handle more current grounding something than
>>it can by bringing something high.
>>
>>
>
>I've heard this many times since I've started working with pics, and
>have just accepted it.  However, if I look at the data sheets for the
>16F87x and the 18Fxxx, they both say:
>
>Maximum output current sunk by any I/O pin:                       25 mA
>Maximum output current sourced by any I/O pin:                    25 mA
>Maximum current sunk by PORTA, PORTB, and PORTE (combined):      200 mA
>Maximum current sourced by PORTA, PORTB, and PORTE (combined):   200 mA
>Maximum current sunk by PORTC and PORTD (combined):              200 mA
>Maximum current sourced by PORTC and PORTD (combined):           200 mA
>
>Since sourced and sunk currents are the same, where does a beginner that
>is only reading the data sheets learn that grounding is better?  Or is
>it reflected in a different characteristic?
>
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