[SI-LIST] Re: Resistor Network
- From: Scott McMorrow <scott@xxxxxxxxxxxxxxxx>
- To: pvincent@xxxxxxxxxxxxx
- Date: Fri, 24 Aug 2001 12:53:01 -0700
Patrick,
We use 8-pin Rpacks (4 resistors) for high speed bus termination, including
DDR, all the time. The trick is to provide a very good termination plane and
fill
area behind the resistors, low impedance mounting and breakout techniques,
and one 0.1uF X7R capacitor per R-pack.
i would not recommend the integrated SSTL-2 termination that some vendors
are providing, as I expect the crosstalk and SSO on these packages will be
quite high.
I am not much of an advocate of RC termination, since it can be extremely
sensitive to edge rate, and data frequency.
best regards,
scott
--
Scott McMorrow
Principal Engineer
SiQual, Signal Quality Engineering
18735 SW Boones Ferry Road
Tualatin, OR 97062-3090
(503) 885-1231
http://www.siqual.com
Patrick Vincent wrote:
> Hi everybody,
>
> What do you think of using Resistor Networks (R-PACK) for SSTL shunt and
> series termination?
>
> Me, I like to use discrete resistor for the shunt termination. This way,
> current is less concentrated in one area so the VTT supply is more stable.
> But now I'm very space limited (like a lot of you I guess...) so I'm
> considering using them.
>
> Also there is Resistor/Capacitor Network, what do you think about them?
>
> Any suppliers to recommand for Termination Network?
>
> Thanks in advance for your feedback
>
> Patrick
>
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