FreeLists / si-list / [SI-LIST] Re: IBIS model Tr accuracy

["Peterson, James F (FL51)" <james.f.peterson@xxxxxxxxxxxxx>]

Andy-
I agree, an IBIS model should be modeled in the way the device is being
used. One O-buff switching while all others are quiescent is only one of
those conditions, and, I daresay, maybe not the most typical one.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Andrew Ingraham
Sent: Wednesday, October 19, 2005 12:30 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: IBIS model Tr accuracy

The other interesting case to look at, would be when the other seven outputs
switch in the opposite direction to the one under test.

Some semiconductor data sheets specify that the specifications hold only
under very specific conditions, one of which may be that only one output or
input pin is switching, and the others are quiescent.  Since IBIS data
sheets (models) don't have this as part of the specification, IBIS models
ought to cover all switching and loading combinations, right??  I wonder how
many IBIS models were created with that in mind.  Probably not many.

Regards,
Andy

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