Active MEMS oscillator for Ethernet timing
The DSC400-0202Q0106KE1T is an active-production MEMS-based XO from Microchip, delivering two LVPECL clock outputs at 153.6 MHz and 155.46875 MHz with ±50 ppm frequency stability. The 2.25 V to 3.6 V supply range lets it run directly off a 2.5 V or 3.3 V rail without an intermediate regulator, and the Enable/Disable function lets the system gate the clock for power savings.
The dual output frequencies map directly to Ethernet line rates: 153.6 MHz is a common reference for 10GbE and 25GbE PHYs, while 155.46875 MHz aligns with SONET/SDH OC-3/OC-12 timing — one oscillator covers both domains. LVPECL output provides a differential signal with typical 800 mV swing into 50 Ω to ground, giving better noise immunity than LVCMOS on long board traces or through connectors.
Housed in a 20-VFQFN with exposed pad, the 5.00 mm x 3.20 mm footprint matches standard 5×3.2 mm oscillator land patterns. The 0.90 mm height keeps it compatible with mezzanine card and blade-server board stack-ups where component clearance is tight.