Re: clarification on IBIS min and max values

Except that:

a) #3 is not necessarily true for slew rate controlled buffers

b) package parameters are not correlated to die parameters

c) it is possible to mix and match from one device to another.

regards,

scott

--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR  97062-3090
(503) 885-1231
http://www.siqual.com
Al Davis wrote:
> On Tue, 14 Nov 2000, Ingraham, Andrew wrote:
> > A simulator does not need to set all parameters to their "min"
> > values", or "max" values, simultaneously.  It can mix-and-match any
> > way it sees fit.
>
> Actually, although this was the original concept, the data really
> must be looked at as 3 data sets, but there is some crossing between
> min and max.  Some simulators may max-and-match, so they can do
> what-if calculations, but in doing so they are using inconsistent
> data.
>
> Consider ....
>
> 1. If you take one pullup/pulldown, with a different set of
> waveforms, the end points will not match.
>
> 2. If you take one voltage_range or pullup_reference with a different
> set of waveforms, the end points will not match.
>
> 3. Rise/fall times are dependent on c_comp, and pullup/pulldown.
>
> 4. The only place temperature is used is in the transit time
> calculation which describes the nonlinear capacitance of the clamps.
> This is part of the load, so if you mismatch, waveforms could be off.
>
> So, consider them to be data sets, but unfortunately, you can't just
> take a column.  It is twisted a bit.
>
> al.