MEMS oscillator with two independent clock outputs
The DSC400-1111Q0085KI1T is a MEMS-based XO (Standard) from Microchip's DSC400 family, delivering two LVCMOS clock outputs at 25 MHz and 125 MHz from a single 20-VFQFN package with an exposed thermal pad.
The supply voltage range of 2.25 V to 3.6 V covers common 2.5 V and 3.3 V rails without an external regulator — one less component on the BOM. Frequency stability is ±50 ppm, a typical budget for 100BASE-T Ethernet and general-purpose processor clocking where the total timing error must stay under 100 ppm.
Housed in a 20-VFQFN with exposed pad, the 5.00 mm x 3.20 mm body and 0.90 mm height suit dense PCB layouts where height clearance is tight — think mezzanine cards or blade servers. The exposed thermal pad requires a via-in-pad or a solid ground-plane connection for heat sinking; the datasheet's recommended footprint should be followed to keep junction temperature within limits.