Dual LVPECL clock source with MEMS resonator
The DSC400-0202Q0107KI2T is a MEMS-based XO from Microchip's DSC400 series that delivers two independent LVPECL output frequencies: 161.1328125 MHz on output 1 and 164.375 MHz on output 2. A single 20-VFQFN package with exposed pad replaces two discrete oscillators, saving board space and reducing BOM count for dual-clock systems like Ethernet switches or FPGA reference clock trees.
Operating from 2.25 V to 3.6 V, this oscillator can be powered directly from a 2.5 V or 3.3 V rail without an intermediate regulator — the wide tolerance covers both nominal rails and their ripple.
Frequency stability and package fit
The 5.00 mm × 3.20 mm × 0.90 mm VFQFN package with exposed pad requires a thermal via array under the pad for proper heat sinking; the 0.50 mm pitch pads need a 4-layer PCB for reliable fan-out.