Dual 100 MHz MEMS oscillator for clock trees
The DSC400-0244Q0009KI2 is a Microchip DSC400-series MEMS-based XO (Standard) delivering two independent 100 MHz outputs from a single resonator die. Each output can be configured as HCSL or LVPECL, which means one device covers both the reference clock for a PCIe switch and the differential clock for an FPGA transceiver bank — no need for two separate oscillators on the same board. For a 100 MHz reference driving a 1 GbE MAC or a PCIe gen2 PLL, that ±25 ppm keeps the accumulated jitter within the receiver's tracking bandwidth — the link does not drop sync on temperature ramps.
Wide supply and package fit
Supply range is 2.25 V to 3.6 V, so the same part runs on a 2.5 V or 3.3 V rail without an intermediate LDO. The 20-VFQFN exposed-pad package (5.00 mm × 3.20 mm, 0.90 mm height) needs a thermal via array under the paddle for best heat transfer — the exposed pad is the primary thermal path, not the leads.