[IBIS-Users] Confused about clamp data in pull-up/down

Dear experts,

I'm a little confused. While going through some papers, I got confused about
data I found in a particular LVTTL IBIS model of a normally trusted source.

At least one source of knowledge tells me that nor the pullup nor the
pulldown curves should contain clamping information (3-stated input static
clamping).

Although, when viewing the curves, I can clearly observe a typical diode
behaviour (for pulldown, gnd relative this appears above vcc, for the
pullup, this appears below 0V)

This made me lose my marbles, with only a few to spare...

I tried finding any supporting information, but all sources I found, state
the same conditions.

Can somebody pls explain why these curves are (in)correct?

Many thanks,

Kind regards,

Kristiaan

 

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