The CY2X013FLXC is a 690 MHz crystal oscillator IC from Infineon Technologies, part of their Clock & Timing ICs line. The 690 MHz output frequency places it in the high-speed clock generation space — think SERDES reference clocks, FPGA transceiver banks, or high-speed ADC/DAC sampling clocks where jitter budget and frequency accuracy are non-negotiable. Drawing 125 mA from a 2.375V to 3.6V supply rail, this oscillator's power consumption is modest for the frequency — the supply current figure is the one to budget in your power tree, not the output amplitude.
The ceramic package provides better thermal stability and lower parasitic capacitance than plastic equivalents — important when the output is a clean 690 MHz sine or clipped sine wave that cannot tolerate loading effects. This oscillator is suited for telecom racks, test equipment, and data-centre gear kept in climate-controlled rooms.