[IBIS-Users] Open drain: Vmeas, Rref and Vref measurement

Hello,

We are working on open-drain buffer IBIS modeling v3.2. 

We have following queries for Vmeas, Rref and Vref parameters,
as per the cookbook v3.2 these parameters are required for timing measurements :-

1> How do we calculate these parameters i.e. Vmeas, Rref and Vref for open-drain buffer, 
   as the Rref cannot be put in such case. 

2> What are the typical values of Rref for any buffer,
   as in general we have only load values in specifications.

3> What could be the value of Vmeas if we have different high and low values of the output 
   buffer in different PVT cases i.e. for 
   Nom Case High value = 3.3V and Low Value = 2.8V
   Min Case High value = 3.0V and Low Value = 2.5V
   Max Case High value = 3.6V and Low Value = 3.1V

Regards
Shiv Harit Mathur
STMicroelectronics




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