156.25 MHz HCSL clock for PCIe and serial links
The DSC1124BI2-156.2500T is a MEMS-based XO (Standard) from Microchip's DSC1124 series, delivering a 156.25 MHz HCSL output — the exact frequency and signal type required for PCIe Gen 1/2/3 reference clocks and 10 Gigabit Ethernet SerDes. The HCSL (High-Speed Current Steering Logic) output swings 700 mV peak-to-peak into a 50-Ω terminated differential pair, which matches the input requirements of most PCIe clock buffers and PHYs without external level translation.
Operating from 2.25V to 3.6V, this oscillator covers both 2.5V and 3.3V supply rails — a single BOM line serves designs that switch between the two. The MEMS resonator itself is less sensitive to vibration-induced frequency shifts than a quartz blank, which matters in motor-drive or pump applications.
6-SMD package — layout and procurement
Housed in a 6-SMD, No Lead package measuring 5.00 mm x 3.20 mm with a seated height of 0.90 mm, the DSC1124BI2-156.2500T fits standard oscillator footprints used across the DSC1124 family. The 0.197" x 0.126" land pattern is compatible with common 6-pin MEMS and quartz oscillator pads, simplifying board layout reuse.