> Note quite. It's actually the net capacitance that's expected to be in > parallel with the crystal. This includes the series combination of your > external capacitors, plus the distributed capacitance of the PCB traces > and the chip pins. Are you really sure, Dave? I thought (although can't find reference right now) that the capacitance rating was the load capacitance required on the output of the crystal to produce the proper phase shift at the rated frequency. I further thought that the capacitor on the input side of the crystal was only there to soften the edges and reduce the harmonics from the driver. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body