Hi,

please explain what is pullability of crystal oscillator and how does it depend on shunt capacitance .....

Thank you.

 

Have a look on this page:
http://www.foxonline.com/techdata.htm

Excerpted:

Pullability
Pullability refers to the change in frequency of a crystal unit, either from the natural resonant frequency (Fr) to a load resonant frequency (FL), or from one load resonant frequency to another. See Figure 6. The amount of pullability exhibited by a given crystal unit at a given value of load capacitance is a function of the shunt capacitance (Co) and the motional capacitance (C1) of the crystal unit