I did some electronics in university and I understand what a 2 pin crystal is. How would one use a 4 pin oscillator (like this one)? I am trying to make a square wave generator circuit, I know how to do that with a 2 pin crystal (I was going to build a schmitt trigger clock circuit). What is the output of the 4 pin oscillator, is it a square wave? If it isn't a square wave, why would someone use this over a two pin crystal? In the datasheet I linked, the 3 used pins are: VCC, GND and OUT.
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