Dan Michaels wrote:

> assuming the circuitry at the node may be represented by a simple
> Thevenin equivalent, would not the node more or less act as a low-pass
> filter, following the BW calculations previously given?

>      +-------Rth------+
>      |                |
>     Vth             Cstray
>      |                |
>     gnd              gnd

  Rth in this circuit is the series combination of the circuit trace
resistance (tens of milliohms) and the driver internal resistance.  A
PIC which can drive 50 mA into a short circuit has a resistance of 100
ohms, so Rth is in total, 100 ohms.  Dedicated bus drivers (without blue
caps!) can be lower again.

  So, your time constant is quite short.  If you put 10 kilohm in
parallel with Cstray, it won't affect much at all.  Certainly, 10 kilohm
in series will slow things right down, but I don't see where this was
proposed.
--
  Cheers,
        Paul B.