>There is no relationship whatsoever between the rise time and the frequency >(or period) of something like a clock signal. You could have a 0.001 Hertz >signal with 1 ps rise times. It is useful to remember a rule stated by Dr. Johnson in an earlier thread: http://www.qsl.net/wb6tpu/si-list2/0513.html For many bus architectures the rise time is approximately five to twenty percent of the clock period. Best Regards, Abe Riazi ServerWorks ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: http://www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: http://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