Actually they start up about an order of magnitude faster than a crystal
oscillator running at the same frequency.  Depending on the application,
that is about the same time as a crystal.  The rise time is largely a
function of frequency and load capacitance.  I use a resonator with an AVR
circuit specifically because it starts up in about 100 uSec where a crystal
was taking milliseconds.  If this is still too slow and the frequency
accuracy you need isn't important, then use the RC.

Check this link from ECS crystals:

http://www.ecsxtal.com/pdf/cer_prin.pdf

Mark Walsh



> Ceramic resonators are not crystals, but they take about as long to start
> up as a crystal does.
>
> -Adam
>
> "Dr. Chris Kirtley" wrote:
> >
> > Thanks for all the tips on ceramic resonators. I'm now having second
> > thoughts. I had assumed that ceramic resonators were as fast as RC
> > oscillators to wake up from sleep, but somebody told me that they are
> > crystals. Which is correct?
> >
> > TIA!
> >
> > Chris
> > --
> > Dr. Chris Kirtley MD PhD
> > Associate Professor
> > HomeCare Technologies for the 21st Century (Whitaker Foundation)
> > NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
> > Dept. of Biomedical Engineering, Pangborn 105B
> > Catholic University of America
> > 620 Michigan Ave NE
> > Washington, DC 20064
> > Tel. 202-319-6247,  fax 202-319-4287
> > Email: kirtley@cua.edu
> > http://engineering.cua.edu/biomedical
> >
> > Clinical Gait Analysis: http://guardian.curtin.edu.au/cga
> > Send subscribe/unsubscribe to listproc@info.curtin.edu.au
> >
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