General Description
The SM802121 is a member of the ClockWorks family of devices from Micrel and provides an extremely low-noise timing solution for 10GbE Ethernet clock signals. It is based upon a unique patented RotaryWave® architecture that provides very-low phase noise.
The device operates from a 2.5V or 3.3V power supply and synthesizes an LVPECL output clock at 156.25MHz. The SM802121 accepts a 25MHz crystal or LVCMOS reference clock.

FEATUREs
• Generates one LVPECL clock outputs at 156.25MHz
• 2.5V or 3.3V operating range
• Typical phase jitter @ 156.25MHz (1.875MHz to 20MHz): 110fs
• Industrial temperature range
• Green, RoHS-, and PFOS- compliant
• Available in 24-pin 4mm  4mm QFN package

APPLICATIONs
• 10 Gigabit Ethernet