SM843001-212

ClockWorks

Ultra-Low Jitter LVPECL Clock Frequency

Synthesizer

ClockWorks is a trademark of Micrel, Inc.

RotaryWave is a registered trademark of Multigig, Inc.

FemtoClocks is a registered trademark of IDT, Inc.

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

General Description

The SM843001-212 is a Fibre Channel, 212.5MHz

LVPECL clock frequency synthesizer and a member of the

ClockWorks

™ family of devices from Micrel. It provides a

low-noise timing solution for high-speed, high-accuracy

synthesis of clock signals. It includes a patented

RotaryWave

very low phase noise.

Power supplies of either 2.5V or 3.3V are supported, with

superior jitter and phase noise performance. The device

synthesizes a 212.5MHz, low-noise, LVPECL output for

Fibre

Channel

applications.

The

crystal

reference

frequency used is 26.5625MHz.

The SM843001-212 is an excellent replacement for IDT

FemtoClocks®, with improved waveform integrity, and

jitter.

Data sheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• Generates a low jitter LVPECL output

• 2.5V or 3.3V operating voltage

• Typical phase jitter ~170fs

(637kHz to 10MHz) @212.5MHz

• Crystal frequency: 26.5625MHz

• 212.5MHz output frequency

• RMS Phase Noise @ 212.5MHz:

– 1kHz:

−119dBc/Hz

– 10kHz:

−127dBc/Hz

– 100kHz:

−135dBc/Hz

– 1MHz:

−138dBc/Hz

– 10MHz:

−160dBc/Hz

– 20MHz:

−165dBc/Hz

• Industrial temperature range

• Green, RoHS-, and PFOS-compliant

• Available in 8-pin TSSOP

Applications

•

Fibre Channel

•

Storage Networking (SAN)

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Block Diagram

October 2010

M9999-100410-A