Subject: RE: Timing parameters

From: Syed Huq <[email-masked]>
Date: Wed, 14 Nov 2001 11:38:18 -0800 (PST)

You could also use the [Model selector] keyword and enter all the various models 
with it's test load and let the user select which ones to use..

Syed

> From: "Dagostino, Tom" <[email-masked]>
> To: "'Gang Huo'" <[email-masked]>, [email-masked]
> Subject: RE: Timing parameters
> Date: Wed, 14 Nov 2001 10:02:54 -0800
> MIME-Version: 1.0
> 
> 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