[SI-LIST] Re: TDR VTT Question

Paul -

Here's a link to a good Micron app note. The app note states that
the absolute maximum VTT current for a 64/72-bit wide channel is
2.6-2.9A. I've used the 3A Micro Linear ML6554 VTT regulator that
is recommended in this app note and it worked like a champ.

http://download.micron.com/pdf/presentations/dram/plat7justin.pdf

Good luck.

Robert

----- Original Message ----- 
From: "Paul Levin" <levinpa@xxxxxxxxxxxxx>
To: "SI-List Reflector" <si-list@xxxxxxxxxxxxx>
Sent: Thursday, October 23, 2003 2:52 PM
Subject: [SI-LIST] TDR VTT Question


> Dear All,
>
> I'm working on a design that calls for a linear regulator to
> create the VTT for a DDR module. My problem concerns the
> likely power dissipation of the device.
>
> While the long-term average numbers of 1's and 0's sent across
> the bus are likely to be equal, I'm looking for the
*distribution*
> of ones and zeroes so that I can calculate the likely heat load
> on the regulator.
>
> Does anybody know this off-hand, or can anybody point me to some
> paper that might answer my question.
>
> Thanks in advance.
>
> Regards,
>
> Paul
>
> -- 
> Paul Levin
> Senior Principal Engineer
> Xyratex Storage Systems
>
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