Subject: RE: Timing parameters

From: "Dagostino, Tom" <[email-masked]>
Date: Wed, 14 Nov 2001 10:02:54 -0800

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
[email-masked]
503-685-1613

-----Original Message-----
From: Gang Huo [mailto:[email-masked]]
Sent: Wednesday, November 14, 2001 8:07 AM
To: [email-masked]
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