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Re: Oscillator enable

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  • normnet2003
    ... Never mind I found one at http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=X130-ND Norm
    Message 1 of 5 , Apr 30 9:04 PM
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      --- In Electronics_101@yahoogroups.com, "normnet2003" <normnet@...> wrote:
      >
      >
      >
      > > --- In Electronics_101@yahoogroups.com, "alienrelics" <alienrelics@> wrote:
      > > >
      > > > The oscillator startup time is spec'd at 10mS, so I'd guess it starts the oscillator when enabled but that it is not sync'd. There is nothing in the specs to lead me to believe that it is or can be sync'd to any outside signal.
      > > >
      > > > You'll need a different circuit for that.
      > > >
      > > > Steve Greenfield
      > > >
      > >
      > > I would think the 10 mS is the time to stabilize after power-up. I would expect the enable signal to work on an AND gate or tri-state buffer. I would not expect the enable signal to be synchronous so a runt pulse could result.
      > >
      > > Richard
      > >
      > I will try enabling/disabling the continuous pulse with logic.
      > My concern is that the oscillator is 25MHz in place of 25.1MHz as
      > specified for VGA.
      > http://www.epanorama.net/documents/pc/vga_timing.html#
      > I haven't found a 25.175MHz oscillator yet.
      > Do you think this will be a problem?
      > Is there a better circuit to sync pulse at 25.175 MHz from a PIC
      > interrupt?
      >
      > Norm

      Never mind I found one at
      http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=X130-ND

      Norm
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