The ZL30281 is a high-performance PCIe Gen 1-4 clock generator.  From a 25MHz crystal or CMOS input these devices generate 100 MHZ in four pre-programmed output configurations immediately on power-up. The
devices have industry-leading output jitter of 160fs RMS (12kHz to 20MHz).

• 25MHz crystal or CMOS input
• Generates PCIe 1, 2, 3, 4 compliant clocks
• Four default configurations selected by hardware pins at reset:
• Config0: 100MHz on output OC1 (CML format)
• Config1: 100MHz on OC1, OC2 (CML)
• Config2: 100MHz on OC1 (CML), OC2 (HSTL)
• Config3: 100MHz on OC1, OC2 (CML) and 25MHz LVCMOS on OC3
• Per-output controls (using SPI or I2C interface)
• Per-output enable/disable and glitch-less start/stop (stop high or low)
• Precise output alignment circuitry and per-output phase adjustment
• SPI or I2C processor Interface
• Tiny 5x5mm QFN package