From owner-ibis-users@eda.org Wed Nov 14 10:02:16 2001 Received: by server.eda.org (8.12.0.Beta7/8.12.0.Beta7) id fAEI1WaE016057; Wed, 14 Nov 2001 10:01:32 -0800 (PST) Message-ID: From: "Dagostino, Tom" To: "'Gang Huo'" , ibis-users@eda.org Subject: RE: Timing parameters Date: Wed, 14 Nov 2001 10:02:54 -0800 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) Content-Type: text/plain; charset="gb2312" Sender: owner-ibis-users@eda.org Precedence: bulk If there is no spec why are you considering using the part? How will you know if the part will work in your design? Very few parts spec an output switching time. If there are multiple timing specs for different loads then pick the load that best matches the circuit you have and put that load into the IBIS model. Then use the timing for that load in your analysis. Tom Dagostino Modeling Manager Mentor Graphics Corp. SAE tom_dagostino@mentor.com 503-685-1613 -----Original Message----- From: Gang Huo [mailto:ghuo@lsil.com] Sent: Wednesday, November 14, 2001 8:07 AM To: ibis-users@eda.org Subject: Timing parameters Hello all, I am wondering what can be put in these parameters (Vref, Rref, Cref and Vmeas) if there is no spec. or the spec. does not specifying the delay and/or output switching time? And if there is multi-cases in the spec.? For example, a device's spec. specified/characterized the delay for a capacitor load to ground ranging from 15pF to 100pF with 4 cases of 15pF, 30pF, 66pF and 100pF. Thanks. Huo,Gang