One more note: I looked and it looks like AC might be the best bet for 5V logic. AUC and LVC seem to be the best overall but require lower voltages (3V or 1.8V). I don't know if you will find a decade counter, but the 74AC163 is a 4 bit synchronous binary counter with a guaranteed minimum max clock rate of 110MHz at 5V, 25 deg C, and a typical max of 140MHz under the same conditions. You could always add a few external gates to make it a decade counter. Sean On Fri, Aug 15, 2008 at 12:20 AM, Sean Breheny wrote: > There is a good chance that the 74F series might do this - that is > right near their typical max clock speed. I would bet that some of the > latest CMOS families could do it, too (perhaps 74AC or 74LVC or > 74AHVC). Another thing to consider would be a small but fast FPGA or > CPLD. Finally, do you really need to count every cycle or could you > prescale it? There are some GHz speed prescaler chips out there (do > not know the part number off hand). > > Sean > > > On Thu, Aug 14, 2008 at 10:47 PM, Rich wrote: >> I need a decade counter that runs 120 Mhz or faster. It does not have to me CMOS. It could be bipolar. I would like to avoid ecl. Does anyone currently use a decade counter that fast? >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist