[SI-LIST] Re: GTL buffers Vref

Hi! all,
  Thanks for all of you that helped me in understanding
  the issues.

  We have come to this conclusion as regards lowering of
  Vref for noise-immunity optimality;

  The vendor specified Vol number is with reference to
  the max sink capability for the GTL driver. If the particular
  configuration is less loaded[like in ours], then the current
  sinkage is also lower[more termination resistance], thereby
  lowering the Vol correspondingly. The Voh on the other hand
  is relatively consistent at ~ Vtt for all configurations.

  Therefore, 
  1). for equal upper and lower noise margins the Vref should
      be set correspondingly lower.
  2). A higher swing [for less current sinking configurations]
      impairs the setup timing window at the receiver circuits.
      That influences the best Vref determination also.

  Pls. post your comments especially if the conclusion is
  immature/incorrect.

Thanks,
Naveen 

-----Original Message-----
From: Gupta, Naveen 
Sent: Friday, August 30, 2002 10:46 AM
To: 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] GTL buffers Vref



Hi all,
  I have a basic question about the Vref for GTL input buffers.
  If the Vref spec states a 1.0 Volts, but better results are obtained
  at a lower voltage, what should be the issues one should examine.
  Relatedly, if better results in turn are obtained at a higher voltage,
then what
  should one examine?

  Thanks for your answers.

Thanks,
Naveen
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