General Description

The SM802124 is a member of the ClockWorks™ family of devices from Micrel and provides an extremely low-noise timing solution for 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 two CMOS output clocks at 125MHz from a 15MHz LVCMOS reference clock.

Features

• Generates two LVCMOS clock outputs at 125MHz

• 2.5V or 3.3V operating range

• Typical rms phase jitter @ 125MHz 1.875MHz to 20MHz : 85fs (Input source dependent)

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

• Green, RoHS, and PFOS compliant

• Available in 24-pin 4mm × 4mm QFN package

Applications

• Gigabit Ethernet