Thank you, Sean. If I have to use a binary it would be cumbersome because I need to cascade 7 of them. But if I can get a Decade that runs a 110 MHz I will settle for it. ----- Original Message ----- From: "Sean Breheny" To: "Microcontroller discussion list - Public." Sent: Friday, August 15, 2008 12:45 AM Subject: Re: [EE] High speed decade counter > 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 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist