> -----Original Message-----
> From: piclist-bounces@mit.edu On Behalf Of Timothy Weber
> Sent: Friday, September 01, 2006 12:27 PM
> 
> David VanHorn wrote:
> > 
> > Protects against ESD, ringing, and radiated EMI.
> 
> I'm transferring at 9600 baud.  Aren't the latter two 
> insignificant at such a low frequency?  Over two-inch traces?

It's the rise/fall time of the signal edges that causes the radiated EMI and
ringing, not the frequency of the signal. However, from a practical
standpoint, it is unlikely that the Tx/Rx ouputs have fast enough edges to
cause a significant problem.

Paul  

> -- 
> Timothy J. Weber

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