156.25 MHz HCSL clock for PCIe and serial links
The DSC1124CI1-156.2500 is a MEMS-based XO (Standard) oscillator delivering a 156.25 MHz HCSL output — the exact frequency and logic family used for PCIe Gen1/2/3 reference clocks and many 10GbE serial interfaces. HCSL (High-Speed Current Steering Logic) provides the low-jitter, differential swing that PCIe root complexes and switches expect, with a typical output swing of 700 mV peak-to-peak into a 50-ohm termination to ground.
The supply voltage range spans 2.25V to 3.6V, covering both 2.5V and 3.3V rails without an external LDO.
Housed in a 6-SMD no-lead package measuring 3.20 mm x 2.50 mm with a seated height of 0.90 mm — a standard 3.2x2.5 mm footprint that matches many quartz oscillators, though the MEMS die inside is smaller. The enable/disable function is on pin 1; leave it high or float for normal operation, pull low to tri-state the output.