Re: [SI-LIST] : SSC

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From: Krishnan S Rengarajan (krishnan@india.ti.com)
Date: Mon Mar 13 2000 - 23:55:59 PST


SS clock synthesizers are used to reduce EMI. For eg. if the output of
a clock driver (synthesizer) is nominally 133mhz, it is spread about this
value (there are different methods : center spread and down spread, the
down spread is the more popular and effective) by about 0.5 to 1.5% percent
of the nominal freq.. Check parts from Cypress Semiconductor, and ICS for
Clock generators for PC motherboards. ICWorks has now merged into Cypress.

Regards
Krishnan

subas wrote:

> Dear Gurus,
>
> What is a Spread Spectrum Clock synthesizer and why it is used in PC
> motherboards? What are the limitations when chosing a PLL for the Registered
> DIMM if you need to support SSC? Do you know of any such chips?
>
> With best regards,
> Subas Bastola
>
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--
R.S.Krishnan, ASIC Product Development Center
Texas Instruments (India) Ltd
GolfView Homes, Murugeshpalaya
Bangalore 560 017 Ph. +91-80-509-9194

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