Three-output MEMS XO for multi-frequency clock trees
The DSC400-0344Q0051KI1 is a MEMS-based XO (Standard) from Microchip's DSC400 series, delivering three output frequencies: 100 MHz on output 1 and 156.25 MHz on outputs 2 and 3. This lets a single oscillator replace two or three discrete XOs on a board carrying a 100 MHz reference and dual 156.25 MHz clocks for Ethernet or FPGA transceivers. Outputs are configurable as HCSL or LVDS, covering the two most common differential signalling standards for high-speed clock distribution. The ±50 ppm frequency stability over the -40°C to 85°C industrial temperature range keeps jitter within the timing budget for 10 GbE and PCIe Gen 3 applications.
Supply voltage and package fit for dense PCB layouts
Wide supply range of 2.25 V to 3.6 V means the oscillator can run from a 2.5 V or 3.3 V rail without a dedicated LDO. The 20-VFQFN exposed pad package (5.00 mm x 3.20 mm, 0.90 mm height) requires a thermal via pattern under the paddle for heat sinking — the pad is electrically connected to ground and should be soldered to a copper plane for rated thermal performance.
The DSC400 series is a current design-in family, so the BOM line is not at risk of sudden discontinuation.