MEMS oscillator with dual HCSL outputs for clock tree consolidation
The DSC400-4444Q0023KI1T is a MEMS-based XO (Standard) oscillator from Microchip's DSC400 series, delivering two independent HCSL outputs at 100 MHz and 156.25 MHz from a single 20-VFQFN package. This part is typically specified in networking equipment, FPGA reference-clock trees, or PCIe applications where the 100 MHz and 156.25 MHz frequencies cover the main clock domains without a second oscillator.
The wide supply range of 2.25V to 3.6V means it can run from a 2.5V or 3.3V rail without an extra regulator — a common scenario on mixed-voltage boards.
The 20-VFQFN exposed-pad package (5.00 mm x 3.20 mm, 0.90 mm height) requires a thermal pad on the PCB for heat sinking — the datasheet's recommended land pattern should be followed to avoid solder bridging under the centre pad.