RE: [IBIS] IV tables Voltage range

You can always do an extrapolation to the -Vdd/2*Vdd limits.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
503-430-1285 FAX
tom@teraspeed.com
www.teraspeed.com

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827 


-----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 3:28 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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