Re: IBIS BIRD59.1 - Model Spec Diagrams

Stephen:

We can probably fine-tune some final wording to resolve this at the
August 20, 1999 meeting. The intent of the Dynamic overshoots were
to allow the overshoot to exceed the Static (DC limit that would
overheat the component) for a short period of time. Some more
information and background is given in the BIRD38, BIRD39 and BIRD40
documents.

Bob Ross,
Mentor Graphics

Stephen Peters wrote:
>
> Hello All:
>
> After reading BIRD 59.1 I have a concern regarding the S_overshoot
> definition.
> The spec, as amended, states the following:
>
> > | The static overshoot subparameters provide the voltage values
> > | for which the model is no longer guaranteed to function
> > |* correctly. Typically these are voltages which would cause
> > |* the physical component to be destroyed.
>
> However, the text (and diagrams) go on to show D_overshoot as a voltage
> *greater* than
> S_overshoot. My interpretation (after much head scratching) is that
> S_overshoot is
> the DC limit. In other words, I assume that exposure to a voltage greater
> than S_overshoot
> but below D_overshoot for more than D_overshoot_time causes device failure.
> If so,
> this needs to be stated, as it is not obvious from the text.
>
> Regards,
> Stephen Peters
> Intel Corp.
Received on Mon Aug 9 16:07:34 1999