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Typical Crystal Design questions to consider…
Q: What is a Piezoelectric Quartz Crystal Unit?
Q: What are the differences between AT-cuts and AT-strip Cuts?
Q: What Is the difference between a "crystal" end a "shrip resonator"?
Q: Can I get crystals rated for-40C to + 85C?
Q: What happens if I operate a crystal outside of its specified temperature range? 
Q: What is the difference between a fundamental and an overtone crystal?
Q: How do I know if I need a fundamental or an overtone crystal?
Q: What are spurs?
Q: Do I need to be concerned about spurs?
Q: What are the motional and shunt capacitances of a crystal unit?
Q: What Is trim sensitivity?
Q: Do I need to be concerned about trim sensitivity?
Q: What is the difference between series resonant and parallel resonant crystals? 
Q: Will a series crystal work in a parallel circuit and vice versa?
Q: How to determine the approximate load capacitance?
Q: What is load capacitance?
Q: What happens if I operate a crystal over its maximum drive level spec? 
Q: I have an existing design that uses a HC49U. What should I consider if I change to the smaller HC49S crystal, or an SMD crystal? 
Q: Can I safely change from a conventional crystal to a "surface mount device"? 
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