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XIO2001: Strange behavior on XIO2001_PNP IBIS Model

Part Number: XIO2001


My customer did the simulation with IBIS model under the the following schematics .

There is the U2 waveform of toggle pattern on 2.5Gbps (1.25GHz) case.  I seem good simulated waveform.

However, on the case of random pattern, they seem to observe strange waveform, because of no stable High or Low.  They doubt IBIS model is wrong.   Could you please let us know your comments?   Please let us.

Thanks and best regards,