Ultra 3 termination and cables

Aloisi, Paul aloisi at unitrode.com
Fri Jul 23 04:33:48 PDT 1999


* From the T10 Reflector (t10 at t10.org), posted by:
* "Aloisi, Paul" <aloisi at unitrode.com>
*

The LVD terminator it self did not change, but the timing for the terminator
to switch between modes did. If you are using the current generation of
terminators change the RC delay for filter out noise 20K and 0.1 uF (2
millisecond) to 50K and 4.7 uF (150 millisecond). There are new terminators
just starting to sample with the longer delay - UCC5672.

There are some minor changes in cable impedance, flat cable is allowed to go
to 140 ohms in the current document. This may be brought back down to 135
ohms or a different break out of how the cables are specified for different
applications. There is a cable meeting next week in Manchester New Hampshire
to continue working the issues. There will be a new cable test annex.

Paul Aloisi

Paul D. Aloisi
Unitrode    MS:84                                 Phone: 603-429-8687
7 Continental Blvd                                FAX: 603-429-8963
Merrmimack, NH 03054                       email: aloisi at unitrode.com
                                       Website: www.unitrode.com


-----Original Message-----
From: Neaz, Joe [mailto:Joe_Neaz at stratus.com]
Sent: Thursday, July 22, 1999 4:44 PM
To: 't10 at t10.org'
Subject: Ultra 3 termination and cables


* From the T10 Reflector (t10 at t10.org), posted by:
* "Neaz, Joe" <Joe_Neaz at stratus.com>
*
Are there any changes to the LVD terminator or cable (impedance, maximum
distances) specifications between Ultra 2 and Ultra 3?

Thanks,
              Joe

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