Dave Celsnak wrote:
> 2.   What type of oscillator works best in the Industrial temperature
> range?  I am using a 4mHz crystal.  Who supplies wide temp. range
> oscillators?
Statek supplies a wide variety of oscillators covering many temperature
ranges (commerical, industrial, miltary), supply voltages, and package
styles.  They make some frequencies (esp. 32.768kHz) with tight
frequency tolerences.  If you're looking for crystals to work at
extended temperatures ranges - stick to what you're alreay using.  After
looking for Mil-temp crystals, I found that most hi-temp crystals are
only commercial-grade parts tested at high temp.  When we could no
longer locate the 125 deg part that we had ordered for years, the
manufacturer admitted that there is nothing special about crystals
operating at higher temperatures (they are, after all, basically
mechanical devices) and that they only spot tested the commercial-grade
parts at higher temperatures.  We have never had a temperature problem
with crystals, even after 100 hour burn-ins at 150 deg and 2 week
cycling between -25 and 150 degrees.

Short version. Oscillators: watch the temperature rating (try Statek).
Cyrstals: don't worry (we use Laptech).

--Matt