General Description

The SM802128 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 3.3V or 2.5V power supply and synthesizes eight LVPECL output clocks at 156.25MHz or 312.5MHz. The SM802128 accepts a 25 MHz crystal or LVCMOS reference clock.

Features

• Generates eight LVPECL clocks at 156.25MHz or 312.5MHz

• 2.5V or 3.3V operating range

• Typical phase jitter @ 156.25MHz (1.875MHz to 20MHz): 110fs with crystal reference

• Industrial temperature range (–40°C to +85°C)

• Green, RoHS, and PFOS compliant

• Available in 44-pin 7mm × 7mm QFN package