I haven't done much impedance control lately, and I can't remember at what length the impedance control becomes significant. Is it 1/4 wavelength? 1/10 wavelength? 1/20 wavelength? In other words, if I have very short traces compared to the frequency, should I even worry about it? (I have some Tx/Rx pairs that theoretically should be routed as differential pairs, but they only need to be routed about an inch away. The clock is 40Mhz) ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------------------------------------- DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 16.0. To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF DesignerCouncil. To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL) For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ---------------------------------------------------------------------------------