SN74CB3Q3257: IBIS model issue

In the IBIS model, the I/O pins are neither inputs nor outputs, they are modelled as series switches. If they are shown as "IN" type, then your software is wrong.

Hi Hailiang,

This is a common question we get. The IBIS model does not define I/O pins as inputs nor outputs since it's just a passive switch. They're modeled as a series switch as Clemens described. The model itself has no issues. 

If there's a chance they're using hyperlynx, we had a similar post in the past on how to resolve this. 

Regards,

Alex