The Si542 from Skyworks Solutions is a XO with Frequency 200 kHz to 1.5 GHz, Supply Voltage 1.71 to 3.465 V, Frequency Stability ±7 ppm, ±10 ppm, ±20 ppm, ±25 ppm, ±50 ppm, Current 64 to 145 mA, Duty Cycle 45 to 55 %. More details for Si542 can be seen below.