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Therfore it is considered as a parallel resonant crystal.
On the other hand, a parallel resonant crystal has always a load capacitance specified. This is the capacitive load the crystal expects to see in the circuit and thus operate at the frequency specified. If the load capacitance is something other than what the crystal was designed for, the operating frequency will be offset from the specified frequency.
For this crystal the load capacitance CL is specifies as 18pF. So it must see a load of 18pF which always comes in parallel, to operate at the specified frequency.
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