RE: [SI-LIST] : Simple load question

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From: Larry Miller (ldmiller@rhapsodynetworks.com)
Date: Wed Jan 24 2001 - 15:20:48 PST


No. Transmission lines look resistive at the source end until a reflection
reaches the source. Think of an infinitely long transmission line, where you
would never get a reflection. The input drive is I = E/Zo forever. I think
Eric Bogatin has a good dissertaion on this.

Larry Miller

-----Original Message-----
From: owner-si-list@silab.eng.sun.com
[mailto:owner-si-list@silab.eng.sun.com]On Behalf Of
brent.dewitt@us.datex-ohmeda.com
Sent: Wednesday, January 24, 2001 2:58 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Simple load question

One of our engineers is very concerned about the "maximum capacitive load"
specification on a processor he's using. This is a relatively fast part
with
rise and fall times on the order of 600 psec. The loads are distributed
across
several memory devices, anywhere from 1 to 9 inches away. Am I correct in
thinking that if the driver sees only the capacitive component of the
transmission line impedance initially and then the "reflected capacitance"
of
each input one round trip reflection time later?

Thanks,

Brent DeWitt

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