RE: [IBIS-Users] logic0 and logic1 problem in IBIS models

From: Muranyi, Arpad <arpad.muranyi_at_.....>
Date: Mon Apr 11 2005 - 11:20:48 PDT
What Tom is writing is correct, but he forgot to
mention the clamp tables.  The currents in the clamps
tables must always be added to the calculation Tom
described to find the high and low levels.

Arpad
====================================================

-----Original Message-----
From: owner-ibis-users@eda.org [mailto:owner-ibis-users@eda.org] On Behalf Of Tom Dagostino
Sent: Monday, April 11, 2005 9:51 AM
To: Akhilesh CHANDRA; ibis-users@eda.org
Subject: RE: [IBIS-Users] logic0 and logic1 problem in IBIS models

Akhilesh

The logic 1 and logic 0 states depend on the load attached to the buffer.
If the load is an open circuit then the logic 0 will be the voltage in the
pulldown table where the current is zero.  The 1 will be the voltage in the
pullup table where the current is zero.  You can construct load lines and
apply those to the IV tables to predict the output voltage for any load.

Regards,

Tom Dagostino
Teraspeed Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
http://www.teraspeed.com
tom@teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

Teraspeed is the registered service mark of
Teraspeed Consulting Group LLC

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Received on Mon Apr 11 11:20:51 2005

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