156.2578 MHz HCSL clock source for PCIe reference
The DSC1124CI5-156.2578: HCSL is the differential signaling standard for PCIe reference clocks — this oscillator is a direct fit for a PCIe Gen 1/2/3 root complex or switch where the 100 MHz reference is multiplied up, or for any 156.2578 MHz SerDes clock requiring the low-swing, 0.7 Vpp typical swing of HCSL.
Supply voltage and temperature envelope
The 42 mA max supply current at 156.2578 MHz is the figure to budget in the clock-tree power calculation; the disable current of 22 mA confirms the Enable pin is worth routing.
Because it is a standard MEMS XO with a common package and output logic, second-sourcing is straightforward: any DSC1124-series oscillator programmed to 156.2578 MHz with HCSL output and ±10 ppm stability is a drop-in. The base product number DSC1124 covers the full family, and the specific code CI5-156.2578 encodes the stability, temperature range, and frequency.