Has anyone had difficulty with crystal start-up. Currently we are having problems with a circuit that uses a PIC16C711- 201/P, 2 @ 22pF load caps and a 20 Mhz AT crystal. The configuration is for fundamental operation. We are using a high temp screen (85 deg C storage before functional check) to try and weed out problems but have still found modules not functional at the production plant. Sleepy crystals have been discussed but we have experimented with three different manufactures of crystals we have ruled this out. One of our action items is to redesign and use 10 Mhz, but right now we aren't sure of the root cause of failure so there really isn't a guarantee that this plan will work. What are some specific design parameters that could be measured to arrive at the root cause? Thanks, Jason --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------