Dual 156.25 MHz HCSL clock source
The DSC2044FE2-H0006 is a MEMS-based XO (Standard) from Microchip's DSC2044 series, delivering two 156.25 MHz HCSL outputs from a single 14-VFQFN package. That frequency pair is the standard reference for 10 Gigabit Ethernet (XAUI) and PCI Express Gen3 — two common high-speed serial busses that share the same 156.25 MHz fundamental. The HCSL output swings 700–900 mV differential, matching the input requirements of most Ethernet PHYs and FPGA transceivers without external level shifting. Supply voltage spans 2.25 V to 3.6 V, covering 2.5 V and 3.3 V rails without a separate regulator.
Commercial temp grade and stability
It fits indoor networking gear, data-centre switches, and test equipment where the ambient stays within that band. The 14-VFQFN exposed-pad package (3.20 mm x 2.50 mm, 0.90 mm height) requires a thermal pad on the PCB for proper heat transfer.
The part ships in tube (standard), and the supply voltage range (2.25–3.6 V) means it drops into a 3.3 V or 2.5 V rail without a regulator change.