Re: [IBIS-Users] IBIS Model Verification

Andy:

The clamp I-V tables should be consistant with the
process/temperature/voltage conditions used for the
pullup and pulldown tables and thet V-T tables. There
is no statement that the clamp currents are ordered by
magnitude. So, Min SPICE should lead to Min IBIS.

Bob

Ingraham, Andrew wrote:
> Pardon me because I'm not a model creator ...
>
> ... but shouldn't the Min table always contain the minimum current, and the
> Max table always contain the maximum current, regardless of how the device
> got to those conditions?
>
> i.e., Min SPICE model does not necessarily lead to Min IBIS current tables.
>
> Of course you could get into some problems around the pull-ups and high
> clamps, on account of the fact that they are Vcc-relative (is it Min
> relative to absolute voltage or relative voltage?).
>
> Regards,
> Andy
>
>
>
>>The min clamp being the strongest is the expected behavior. As
>
> temperature
>
>>goes up the forward voltage drop of the diode decrease for a given
>
> current.
>
>>Thus for a given voltage the current will be greater.
>
>
> ...
>

-- 
Bob Ross
Teraspeed Consulting Group LLC     Teraspeed Labs
121 North River Drive              13610 SW Harness Lane
Narragansett, RI 02882             Beaverton, OR 97008
503-750-6481                       503-430-1065
http://www.teraspeed.com           503-246-8048 Direct
bob@teraspeed.com
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