Crystals previously mentioned 30 MHz (as many as >200 MHz) are generally operated at sequence resonance where the impedance seems at its minimum and equivalent to the collection resistance. For these crystals the sequence resistance is specified ( Predecessor of floor mount technologies but nonetheless valuable in specific scenarios, which https://bookmark-search.com/story18899486/the-fact-about-smd-crystal-oscillators-that-no-one-is-suggesting