Re: [SI-LIST] : Best type of models, edge rates & load

David Haedge (d-haedge@raytheon.com)
Tue, 20 Jul 1999 16:58:21 -0500

Mark Nass wrote:
>
> There has been some discussion recently about parameters of parts
> specified into 40pf caps and accuracy of models. I generate this type
> of data for our devices for our own use and our customers. So I am
> curious as to what people think would be the optimal way to generate
> Tco, Tsu, jitter parameters and IBIS models so that they would be confident
> they were getting exactly what they needed for signal integrity and timing
> analysis. Any feedback?
>
> Mark Nass

Mark,

Can your provide the SI community some insight on how you generate these
parameters now. Specifically, do you take measurements on a number
of different samples over temp/voltage ranges and with different loads?
Are they SPICE derived? Do you specify a certain amount of 'cushion'
in the parameters? This might be helpful to those of us who don't know
how vendors derive the numbers.

Thanks,
David Haedge
Raytheon

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