Try these Digi-Key p/n's: Surface mount 40MHz resonators PX400CTR-ND PX400JCT-ND PX400JTR-ND PX400CCT-ND Or, if you don't like surface mount and don't mind spending a little extra, do what I do and get yourself a 40MHz crystal oscillator. They are 1 part, 3 connections, can be a clock source for multiple chips (especially when you include a buffer) and provide a very robust temperature stable clock signal. ----- Original Message ----- From: Ted Larson To: Sent: Wednesday, April 30, 2003 5:14 PM Subject: 40mhz clock for PIC18FXX2... > I just got my hands on an PIC18F252 to fiddle around with, and I want to > clock it at 40mhz. On the PIC16's I am used to just throwing a 20mhz > ceramic resonator w/caps on there, and being done with it....1 > component...nice and simple. I couldn't find a 40mhz resonator to make this > as simple an operation. > > So, what do most people do for a 40mhz, reliable, simple clock for these? > > The data sheet seems to suggest using a HS/PLL circuit to 4xstep-up a 10mhz > crystal. This seems like overkill, and alot of additional > circuitry...although would be nice without lots of EMI to mess things up. I > have a couple of 20mhz crystals laying around I could double....but, keeping > it simpler is sounding good to me. I really don't need the whole selectable > clocking feature that using the PLL really buys. > > I am still quite the PIC newbie....so any suggestions would be greatly > appreciated. > > Thanks, > > - Ted > > -- > http://www.piclist.com#nomail Going offline? Don't AutoReply us! > email listserv@mitvma.mit.edu with SET PICList DIGEST in the body -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body