My apologies, I just looked up the graph and you are
correct; at minute currents the PIC output pins will
approach 0v and 5v. Since I always drive outputs at
least a few mA I was used to the sat voltage gap.
:o)
-Roman



Spehro Pefhany wrote:
>
> At 02:49 PM 2/3/2003 +1100, you wrote:
>
> >Sorry, that should have been TTL or CMOS. :o)
> >A PIC output set to low will go close to 0v, IF
> >there is something to pull it down, but not if it
> >is held by a cap etc. There is no mechanism to sink
> >current to drain the cap, unless you include the
> >cap leakage. Likewise at the high end the PIC can
> >only source current to *around* 4.5v or so, these
> >specs are clearly described in the datasheet.
>
> Not true, Roman. The outputs look like a low-value resistor to Vdd or Vss,
> with a tiny bit of leakage from the opposing MOSFET. Of course if there
> is a lot of current flowing through the Vdd or Vss pin, there may be some
> offset, but we're talking tens of mV at worst.

--
http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.