RE: [SI-LIST] : PECL Clocks.

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Thu Feb 15 2001 - 17:41:24 PST


Well, a clock distribution chip (they are way less expensive) may help.
Check Synergy or Cypress' Roboclock.
One for two - should work; terminate parallel in the end.

Mike.

-----Original Message-----
From: K.Orthner [mailto:korthner@inf.furukawa.co.jp]
Sent: Thursday, February 15, 2001 08:25
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : PECL Clocks.

Hello, All.

I'm going to be buying some expensive +/-20ppm 77.76 MHz PECL oscillators to
provide the reference clocks for OC12 SerDes. I will have 4 Serdes on a
board, arranged in two pair. The two of the pair will be within an inch or
two of each other (PQFP64 packages.)

I'm hoping I can use 1 oscillator to drive two serdes, but I'm not
completely sure I can do this and expect everything else to work properly.
If I keep the distance between the two Serdes short, and I terminate
properly after the last serdes, I think maybe I can get away with it.

I'm hoping someone can tell me that this will be no problem, or that I
really shouldn't try.
Any comments or suggestions will be greatly appreciated.

Thanks in advance,
-Kent

--
Kent Orthner                         ??  ??
Furukawa Electric                    ??????
5-1-9 Higashi-Yawata, Hiratsuka, 254-0016 Japan
Tel: (0463) 24 8451   Fax:(0463)24-8490
korthner@inf.furukawa.co.jp

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