RE: [IBIS] IV tables Voltage range

Muniswar,

According to the spec it is required, but as you
discovered, the parser doesn't flag it.

I know in this day of age with low voltage swing
buffers this doesn't always makes sense, so I
usually recommend to people to make the I-V curves
based on the normal voltage swing conditions, not
the supply conditions, and then add a point on
each end of the I-V table by hand at -Vcc and 2*Vcc.

So if you have a buffer with a 1.5 V supply but its
signaling goes between 0.5 and 1.0 V, I would say
putting meaningful data in the I-V table in the
range of 0.0 to 1.5 V would be sufficient.  After
that just add two points at -1.5 V and 3.0 V.

I hope this helps,

Arpad
====================================================

-----Original Message-----
From: owner-ibis@server.eda.org [mailto:owner-ibis@server.eda.org] On
Behalf Of Muniswara Reddy Vorugu
Sent: Wednesday, December 10, 2008 5:28 AM
To: ibis@server.eda.org; IBIS-ATM
Subject: [IBIS] IV tables Voltage range

Hi,
Is it compulsory to have the IV table ranging from -VDD to 2*VDD?
I have got a model with range -0.5*VDD to 1.5*VDD. Is it a quality
issue? 
IBIS golden parser did not give any error/warning.


For example

[Voltage Range]                2.5             NA              NA

[Pullup Reference]             2.5             NA              NA

[Pulldown Reference]           0.0             NA              NA

[POWER Clamp Reference]        2.5             NA              NA

[GND Clamp Reference]          0.0             NA              NA  
  
Is it compulsory for POWER clamp and ground clamp to be in range -2.5 to
5.0

I have got a model from range -1.25 to 3.75. Is it a quality issue. 


Thanks,
Muniswar

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