Dual-frequency HCSL clock source for PCIe and Ethernet
The DSC400-4444Q0023KI2T is a MEMS-based XO (Standard) oscillator that delivers two HCSL outputs at 100 MHz and 156.25 MHz from a single 20-VFQFN package. These frequencies are common reference clocks for PCIe and 10/25 GbE SERDES, so this part can replace two discrete quartz oscillators on the same board footprint.
MEMS reliability vs quartz in industrial temperature
The supply voltage range of 2.25V to 3.6V covers common 2.5V and 3.3V rails without an external LDO, simplifying the power tree.
The 5.00 mm × 3.20 mm × 0.90 mm 20-VFQFN package with exposed pad requires a thermal via pattern under the pad for proper heat dissipation; the small footprint fits dense multi-layer boards.