MEMS XO with HCSL output — supply and temperature fit
The DSC400-4444Q0024KE1 is an active MEMS-based XO (Standard) oscillator from Microchip's DSC400 series, delivering an HCSL output — the differential current-mode logic common in PCIe reference clocks and high-speed SERDES interfaces. Its wide supply range of 2.25V to 3.6V means it runs from a 2.5V or 3.3V rail without an intermediate LDO, simplifying the power tree. The -20°C to 70°C operating temperature range suits commercial indoor equipment, office networking gear, and consumer appliances — not extended industrial or automotive environments.
Package and layout — 20-VFQFN with exposed pad
Housed in a 20-VFQFN Exposed Pad package measuring 5.00mm x 3.20mm with a 0.90mm height, the DSC400-4444Q0024KE1 requires a thermal pad on the PCB for heat dissipation and mechanical stability. The Enable/Disable function lets the system gate the output clock without removing supply, useful for power-sensitive designs.