You could have a look at this paper by Lee Ritchey... http://www.speedingedge.com/docs/diffsig.doc=20 Cheers, Martin >>> Mellberg Hans <htmguy@xxxxxxxxx> 30 July 2001 18:46:55 >>> A question; on a LVDS differential pair trace running 622MHz clocks, I am using 10 mils as my trace length differential maximum. This occurs at the footprint of the package for routing purposes. Is this reasonable or am I being too strict? Second question, again at the package footprint the differential pair must separate to attach to the via array. What is a reasonable maximum length the traces can be without maintaining the 100 Ohms? is 25 mils reasonable? Thanks in advance Hans Mellberg __________________________________________________ Do You Yahoo!? Make international calls for as low as $.04/minute with Yahoo! Messenger http://phonecard.yahoo.com/=20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: =20 //www.freelists.org/archives/si-list=20 or at our remote archives: http://groups.yahoo.com/group/si-list/messages=20 Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu=20 =20 ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu