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New drive level requirement for 24 MHz crystal oscillator

Question asked by Peter Lischer on Dec 15, 2014
Latest reply on Sep 22, 2015 by jiri-b36968

In the just released technical data sheet revision 8 (Document Number VYBRIDFSERIESEC), the drive level requirement of the 24 MHz crystal oscillator have been changed. Before, the requirement was 100uW, now it is increased to 250uW. It is not easy to find crystal oscillators in small SMD package with such a high drive level rating. Therefore, my question is why Freescale has increased the drive level requirement? Have there been any reports of problems with crystals that are only rated with 100uW. Are there any recommendation for a suitable 250uW crystal that would fit our 5×3.2 mm footprint on our design?