MEMS XO with HCSL output – 50/100/125/156.25/200 MHz
The DSC2044FE1-H0002T is a MEMS-based XO (Standard) from Microchip's DSC2044 series, delivering HCSL output on two independent frequency channels — Output 1 covers 50, 100, 125, 156.25, and 200 MHz; Output 2 covers the same set except 200 MHz. The HCSL (High-Speed Current Steering Logic) output is the standard for PCIe reference clocks — this part directly drives a PCIe clock tree without an external level translator.
Runs from 2.25 V to 3.6 V, so it works on 3.3 V and 2.5 V rails without a separate regulator — the 3.3 V compatibility question is answered: yes, it operates on 3.3 V with margin.
Package and PCB layout – 14-VFQFN exposed pad
Housed in a 14-VFQFN with exposed pad, 3.20 mm x 2.50 mm body, 0.90 mm height — the thermal pad must be soldered to a ground plane for proper heat dissipation and mechanical stability.