On Fri, 27 Apr 2012 15:52:33 +0200, Attila Kinali <[email protected]> wrote:
>On Wed, 25 Apr 2012 19:17:43 -0300 >Daniel Mendes <[email protected]> wrote: > >> About replacing the 74ACT175... there´s a company called "Potato Semi" >> (well.. they make "chips", right?) whose sole business is to make damn >> fast 74 logic. Their chips can be bought at ebay in small quantities. >> Look at this 600MHz D flip flop: >> >> http://www.potatosemi.com/potatosemiweb/datasheet/PO74G74A.pdf > >Hmm... looks interesting. Though, i probably would take >standard ECL instead of those because of higher availability >(you can get them from mouser, digikey & co). I would like to see some real world test results. They charge $3 per 74G chip plus shipping through their Ebay store so the total price is not much lower than ECL from Mouser or Digikey. >But good to know that at least someone is still trying to improve >standard 74xx devices, for all those who do not want to use an CPLD/FPGA. I have been going through various papers plus the Xilinx and Altera forums reading about time delay counter design in connection with a project I am working on involving equivalent time and high bandwidth sampling. One of the problems they have with the FPGA and CPLD designs in significant input jitter even before the delay time chain is considered. For best results, all I/Os and other functions have to be inactive during the measurement. One of the papers discussed disabling the LED heartbeat indicator to gain about 50ps of accuracy. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
