Subject: Re: [IBIS-Users] ibis question
From: Peter LaFlamme (plaflamm@amcc.com)
Date: Fri Jan 24 2003 - 08:12:59 PST
Hi Siva,
The input models are simply esd ground clamps. This must be how the semiconductor vendor implements ESD on these devices. Because they are ground clamps they are not dependent on the VDD or Voltage range of the receiver, so the two inputs behave exactly
the same I/V characteristics. If they also had a power clamp then the behavior would be different because the power clamp would tie the Voltage range (VDD) to the input in some manor.
Peter
-- Peter LaFlammeApplied Micro Circuits Corp. System Applications Engineer 200 Minuteman Rd, 3rd Floor Andover, MA 01810
978-247-8470 phone 978-623-0055 Fax
"Sivakumar S. - CTD, Chennai." wrote: > > IBIS Gurus, > I have a ibis model with the following inputs > INPUT1,INPUT2.When I compare these two inputs, there is no difference except > the [Voltage Range].I would like to know whether these will have similar > characteristics and behaviour or not?.Could anybody please give me some > explanation?.I have checked these two INPUTs in the hyperlynx ibis editor > and captured waveform and attached waveform for your reference. > > And also in some IBIS models, I found that the input buffers are > defined with POWER_CLAMP and GND_CLAMP .But this model is having only > GND_CLAMP defined. What will be the effect? could anybody explain me? > > [Model] INPUT1 > Model_type Input > Vinl = 0.75v > Vinh = 1.75v > | variable typ min max > C_comp 2.0pF 1.5pF 2.5pF > | > |variable typ min max > [Temperature Range] 50 0 100 > | > |variable typ min max > [Voltage Range] 2.5 2.375 2.7 > | > [GND Clamp] > |voltage typ min max > 0 0 NA NA > -0.3 0 NA NA > -0.4 -0.05m NA NA > -0.5 -0.5m NA NA > -0.55 -1.3m NA NA > -0.6 -2.6m NA NA > -0.65 -4.4m NA NA > -0.7 -6.8m NA NA > -0.75 -9.6m NA NA > -0.8 -13.7m NA NA > -0.9 -26.0m NA NA > -1.0 -42.5m NA NA > -1.2 -81.5m NA NA > -1.5 -145.1m NA NA > -1.8 -212.6m NA NA > -2.1 -279.1m NA NA > -2.4 -344.8m NA NA > -2.7 -415.5m NA NA > -3.0 -480.1m NA NA > > [Model] INPUT2 > Model_type Input > Vinl = 0.75v > Vinh = 1.75v > | variable typ min max > C_comp 2.0pF 1.5pF 2.5pF > | > |variable typ min max > [Temperature Range] 50 0 100 > | > |variable typ min max > [Voltage Range] 3.3 3.135 3.6 > | > [GND Clamp] > |voltage typ min max > 0 0 NA NA > -0.3 0 NA NA > -0.4 -0.05m NA NA > -0.5 -0.5m NA NA > -0.55 -1.3m NA NA > -0.6 -2.6m NA NA > -0.65 -4.4m NA NA > -0.7 -6.8m NA NA > -0.75 -9.6m NA NA > -0.8 -13.7m NA NA > -0.9 -26.0m NA NA > -1.0 -42.5m NA NA > -1.2 -81.5m NA NA > -1.5 -145.1m NA NA > -1.8 -212.6m NA NA > -2.1 -279.1m NA NA > -2.4 -344.8m NA NA > -2.7 -415.5m NA NA > -3.0 -480.1m NA NA > > Your comments are greatly appreciated. > > regards > siva > > > ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- > Name: Model INPUT2 _3_3- Ground clamp.pdf > Model INPUT2 _3_3- Ground clamp.pdf Type: Acrobat (application/pdf) > Encoding: base64 > > Name: Model INPUT1 _2_5- Ground clamp.pdf > Model INPUT1 _2_5- Ground clamp.pdf Type: Acrobat (application/pdf) > Encoding: base64 |------------------------------------------------------------------ |For help or to subscribe/unsubscribe, email majordomo@eda.org |with just the appropriate command message(s) in the body: | | help | subscribe ibis <optional e-mail address, if different> | subscribe ibis-users <optional e-mail address, if different> | unsubscribe ibis <optional e-mail address, if different> | unsubscribe ibis-users <optional e-mail address, if different> | |or email a written request to ibis-request@eda.org. | |IBIS reflector archives exist under: | | http://www.eda.org/pub/ibis/email_archive/ Recent | http://www.eda.org/pub/ibis/users_archive/ Recent | http://www.eda.org/pub/ibis/email/ E-mail since 1993
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