156.25 MHz HCSL MEMS oscillator for PCIe and Ethernet reference clocks
The DSC1124CI1-156.2500T is a MEMS-based XO (Standard) oscillator delivering a 156.25 MHz HCSL output — the exact frequency and logic family used as the reference clock for PCIe Gen1/2/3 and 10GbE SerDes blocks. Its supply voltage spans 2.25V to 3.6V, so it runs directly from a 2.5V or 3.3V rail without an intermediate LDO, saving a regulator and its associated board area.
MEMS vs quartz — what the resonator choice means for the BOM
MEMS oscillators typically start up in under 5 ms versus 10-20 ms for a quartz crystal, and they survive 50,000 g shock — relevant if the board ships in a vibration-prone enclosure or sees drop testing.