[SI-LIST] Re: GTL buffers Vref

Hi! Naveen, I agree with the conclusion because the
amount of current sourced or sinked depends upon the
loaded interconnect.
Bob
--- "Gupta, Naveen" <naveen@xxxxxxxxx> wrote:
> 
> 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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