Four-output MEMS clock source for dense timing trees
The DSC400-2222Q0105KI1 is a MEMS-based XO (Standard) from Microchip's DSC400 series, delivering four LVPECL output frequencies from a single 20-VFQFN package — 200 MHz, 156.25 MHz, 125 MHz, and 100 MHz — each with ±50 ppm stability. A single 2.25 V to 3.6 V supply rail powers all four outputs, so the oscillator can run from a 2.5 V or 3.3 V plane without an intermediate regulator.
Supply range and output type for clock tree planning
The wide 2.25 V to 3.6 V supply range means the DSC400-2222Q0105KI1 operates across both 2.5 V and 3.3 V logic families without a dedicated voltage rail — the Enable/Disable function lets the system gate the outputs for power sequencing or test modes. LVPECL outputs provide low-jitter differential signalling for high-speed SerDes, Ethernet PHY reference clocks, and FPGA transceiver banks — the 200 MHz top output directly clocks a 10 GbE MAC or a Xilinx GTH quad.
Housed in a 20-VFQFN with exposed pad (5.00 mm x 3.20 mm, 0.90 mm height), the DSC400-2222Q0105KI1 requires a thermal via array under the centre pad for heat sinking — the exposed pad must be soldered to a ground plane to keep the MEMS die within the -40 °C to 85 °C operating range.