If i remember correctly a regular twisted pair has about 14pf/foot of
capacitance.  The output pins are rated at 50pF max capacitance.  If this
is a paralell interface try using some 74HCT series buffers, you should be
able to get 10ft.


On Fri, 28 May 1999, Steven Kosmerchock wrote:

> Friends,
> I am having a serious problem with a PIC
> project. I am using a PIC16C67 running at
> 2.4576MHz (TTL canned OSC.). Two of the
> I/O lines go through about 6 feet of wiring.
> The problem is that the lines are having
> problems with (I'm guessing!?) capacitance.
> I will use a very short cable and everything
> seems to work fine. I checked the long cable
> and there isn't problem with it. I am curious about
> how the PIC treats capacitance and hopefully
> some of the PICers out there can make a few
> suggestions. Any help would be greatly appreciated!!
> Thanks in advance!!!
>
> Best regards,
> Steven
>
>
> Steven Kosmerchock
> Engineering Technician/Student
> CELWAVE
> Phoenix   Arizona   USA
> Email:   steve.kosmerchock@celwave.com
> www.geocities.com/researchtriangle/lab/6584
>