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9

The green "shaded" area is the vRestrict area, which restricts the placement of vias in the designated area for design-rule checking (DRC). Why is this an important consideration? Because the metallic (and therefore conducting) crystal can is laid flat and could make contact to exposed PCB traces that are not covered with solder resist. Typically, ...


3

The metallic crystal casing might short vias. tRestrict is the only way of preventing tracks from being laid under the crystal, unfortunately it also prevents copper pour, even though it's considered a good practice to lay the copper. In theory it adds capacitance, but that shouldn't have an effect for a mechanical resonator and it doesn't load the resonator ...


1

Some of the things a designer might think about: EMI: the signal from the Xtal_out pin to the crystal has a strong, high-frequency signal; if there are any other traces near/under the crystal, they could pick up some of this signal, which might directly interfere with their function -- and even if they are digital lines and it doesn't interfere with their ...


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