SM843256

10 Gigabit Ethernet and SONET, 6 output,

Ultra-Low Jitter LVPECL Frequency

Synthesizer

RotaryWave is a trademark of Multigig, Inc.

July 2010

M9999-072110-B

General Description

The SM843256 provides a low-noise timing solution for

high speed, high accuracy synthesis of clock signals.

Common applications include SONET, Gigabit Ethernet,

10 Gigabit Ethernet, and similar networking standards. It

includes a unique power reduction methodology, along

with a patented RotaryWave

very stable clock with very low noise.

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

superior jitter and phase noise performance. The device

synthesizes

different

low

noise

LVPECL

output

frequencies such as 125MHz, 156.25MHz, 312.5MHz, and

625MHz for Ethernet applications; 77.76MHz, 155.52MHz,

311.04MHz, and 622.08MHz for SONET applications. The

crystal reference frequencies used include 25MHz and

19.44Mhz

for

Ethernet

and

SONET

applications,

respectively.

The SM843256 is an excellent replacement for IDT Femto-

clocks, with improved accuracy, power consumption,

waveform integrity, and jitter.

Data sheets and support documentation can be found on

Features

• Generates six LVPECL outputs

• 2.5V or 3.3V operating range

• Typical phase jitter @ 156.25MHz

(1.875MHz to 20MHz): 80fs (typical) @ 3.3V

• 75MHz to 625MHz output frequencies

• Industrial temperature range

• Green, RoHS, and PFOS compliant

• Available in 24-pin TSSOP EPAD

• Operating supply modes:

Core/Output

3.3V/3.3V, 3.3V/2.5V, 2.5V/2.5V

Applications

• SONET

• Gigabit Ethernet

• 10-Gigabit Ethernet

• Infiniband

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