SM802123

ClockWorks

™ 125MHz/25MHz

Ultra-Low Jitter, LVCMOS

Frequency Synthesizer

ClockWorks is a trademark of Micrel, Inc

RotaryWave is a registered trademark of Multigig, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

January 2012

M9999-012312-A

General Description

The SM802123 is a member of the ClockWorks

™ family of

devices from Micrel and provides an extremely low-noise

timing solution. It is based upon a unique patented

RotaryWave

noise.

The device operates from a 2.5V or 3.3V power supply

and synthesizes 16 LVCMOS output clocks, eight at

125MHz and eight at 25MHz. The SM802123 accepts a

25MHz LVCMOS reference input.

Data sheets and support documentation can be found on

Features

• Generates eight LVCMOS output clocks at 125MHz and

eight LVCMOS output clocks at 25MHz

• 2.5V or 3.3V operating range

• Typical phase jitter @ 125MHz

(1.875MHz to 20MHz): 115fs

• Industrial temperature range

• Green, RoHS, and PFOS compliant

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

Applications

• Gigabit Ethernet – (GbE)

________________________________________________________________________________________________

Block Diagram Top Level Schematic