What this MEMS oscillator gives the board
It outputs four fixed LVCMOS frequencies — 24 MHz, 27 MHz, 74.25 MHz, and 148.5 MHz — on separate output pins, so one device can clock the USB/ethernet controller (24 MHz), the HDMI/audio codec (27 MHz), and the video encoder (74.25/148.5 MHz) simultaneously.
The ±25 ppm stability covers temperature, aging, and supply variation — tight enough for a 148.5 MHz HD-SDI clock without external VCXO or PLL trim. If your system needs <±25 ppm, you are looking at a TCXO or OCXO; this is the best you get from a standard XO.
Supply range 2.25V to 3.6V means it works on a 2.5V or 3.3V rail without a separate LDO — one less part on the BOM.
14-VFQFN with exposed pad, 3.20 mm x 2.50 mm body, 0.90 mm height. A via-in-pad or thermal land under the package is required; the datasheet recommends a 2.0 x 1.6 mm pad with at least four thermal vias.
The DSC2010 series is Microchip's current-generation MEMS oscillator family; no pin-compatible successor has been announced.