What this MEMS XO does in the assembly
The DSC2011FI2-E0001 is a MEMS-based XO (Standard) that generates two independent output frequencies from a single silicon resonator — Output 1 can be 24, 25, 27, 48, 50, or 54 MHz; Output 2 can be 24, 27, 50, 54, or 125 MHz. This lets one device clock two different system buses, for instance a 25 MHz Ethernet PHY and a 50 MHz FPGA fabric, reducing oscillator count and board area. The Enable/Disable function on a dedicated pin allows the second output to be gated for power saving.
Supply voltage spans 2.25V to 3.6V — a single DSC2011FI2-E0001 can be powered from a 2.5V or 3.3V rail without an extra LDO, simplifying the power tree and reducing BOM cost.
Housed in a 14-VFQFN with exposed pad (3.20 mm × 2.50 mm body, 0.90 mm height), the package requires a thermal pad on the PCB for proper heat dissipation. The leads fan out easily on a two-layer board, but the exposed pad demands a solder-paste stencil opening that matches the datasheet land pattern.