Hi > On Jul 2, 2020, at 6:38 PM, jimlux <[email protected]> wrote: > > On 7/2/20 2:50 PM, Bob kb8tq wrote: >> Hi >>> On Jul 2, 2020, at 5:30 PM, jimlux <[email protected]> wrote: >>> >>> On 7/2/20 11:37 AM, ed breya wrote: >>>> It's been fun reminiscing about all these dividers and techniques, but >>>> getting back to the OP, the original search was for a divide by 5 with >>>> "low power" and operation from 5 to possibly 3.3V, and clocking properly >>>> at 50 MHz. One would assume also minimal size and complexity, and low cost. >>> >>> You forgot to add rad-hard.. I was the OP - This has been a fascinating >>> thing - we have a breadboard that uses a fancy clock distribution chip that >>> consumes close to a watt (and has too much jitter, as well).. >> >>> 3) It's hard to even find programmable logic that is simple and small. All >>> the mfrs tout their latest tiny parts with *only half a million gates* (I >>> exaggerate, but you get the picture) >> If they want to sell you a fully self contained "million gate" device for a >> couple bucks, is that really >> a bad thing? Sure, if it’s in a thousand pin BGA, it’s a bad thing. If it’s >> in a < 40 pin package that >> you can get on a small board …. maybe not so much. > > yes, if it's in a small pinout package. One other peculiarity that I've been > burned by is that a lot of the modern devices with large logic and few I/O > pins have power dissipations that are clock rate independent for the internal > logic - it's the leakage current that dominates and that's VERY dependent on > die temp. > > > I think though, that the marketplace is driving towards increased > functionality on one chip, with bigger die size. Those of us who want 50 > gates at medium or low speed are distinctly in the minority.
There are very few applications that require that sort of device. Volume matters ( a lot !!) Bob > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
