Subject: Re: [IBIS-Users] Temperature Range:
From: Al Davis (aldavis@ieee.org)
Date: Wed Mar 27 2002 - 17:22:35 PST
On Wednesday 27 March 2002 17:43, Peters, Stephen wrote:
> Actually, IBIS models with a 'min' temperature higher than the
> 'max' temperature are perfectly correct, assuming the part being
> modeled is CMOS. As explained on pg. 57 of the IBIS spec, the 'min'
> value of [Temperature Range] is the value that causes or amplifies
> the slow/weak condition, while the 'max' value is the value that
> causes or amplifies the fastest/strongest condition. With CMOS,
> cold is fast & hot is slow. TTL logic is just the opposite.
That doesn't make sense. The only place it is actually used in
calculations in transit time, when [TTpower] or [TTgnd] keywords are
used. These define the nonlinear capacitance in parallel with the
clamps. High temperature is always low capacitance, therefore "fast".
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