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SI5338C

I2C-PROGRAMMABLE ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR

Silicon Laboratories 

Si5338

I 2C - P ROGRAMMABLE A NY- F REQUENCY, A NY- O UTPUT Q UAD C LOCK G ENERATOR

Features

 Low power MultiSynth™ technology  Single supply core with excellent

enables independent, any-frequency

PSRR: 1.8, 2.5, 3.3 V

synthesis on four differential output  Independent frequency increment/

drivers

decrement feature enables

 Highly-configurable output drivers with glitchless frequency adjustments in

up to four differential outputs, eight

1 ppm steps

single-ended clock outputs, or a

 Independent phase adjustment on

combination of both

each of the output drivers with an

 Low phase jitter of 0.7 ps RMS typ

accuracy of <20 ps steps

 High precision synthesis allows true  Highly configurable spread

zero ppm frequency accuracy on all

spectrum (SSC) on any output:

outputs

Any frequency from 5 to 350 MHz

 Flexible input reference:

Any spread from 0.5 to 5.0%

External crystal: 8 to 30 MHz

Any modulation rate from 33 to

CMOS input: 5 to 200 MHz

63 kHz

SSTL/HSTL input: 5 to 350 MHz  External feedback mode allows

Differential input: 5 to 710 MHz

zero-delay mode

 Independently configurable outputs  Loss of lock and loss of signal

support any frequency or format:

alarms

LVPECL/LVDS: 0.16 to 710 MHz  I2C/SMBus compatible interface

HCSL: 0.16 to 250 MHz

 Easy to use programming software

CMOS: 0.16 to 200 MHz

 Small size: 4 x 4 mm, 24-QFN

SSTL/HSTL: 0.16 to 350 MHz

 Low power: 45 mA core supply typ

 Independent output voltage per driver:  Wide temperature range: –40 to

1.5, 1.8, 2.5, or 3.3 V

+85 °C

Applications

 Ethernet switch/router

 PCI Express 2.0/3.0

 Broadcast video/audio timing

 Processor and FPGA clocking

 Any-frequency clock conversion

 MSAN/DSLAM/PON

 Fibre Channel, SAN

 Telecom line cards

Ordering Information:

See page 168.

Pin Assignments

Top View

24 23 22 21 20 19

IN1 1

18 CLK1A

IN2 2

17 CLK1B

IN3 3

IN4 4

GPGNaNdDD

16 VDDO1

15 VDDO2

IN5 5

14 CLK2A

IN6 6

13 CLK2B

7 8 9 10 11 12

Description

The Si5338 is a high-performance, low-jitter clock generator capable of

synthesizing any frequency on each of the device's four output drivers. This timing

IC is capable of replacing up to four different frequency crystal oscillators or

operating as a frequency translator. Using its patented MultiSynth™ technology,

the Si5338 allows generation of four independent clocks with 0 ppm precision.

Each output clock is independently configurable to support various signal formats

and supply voltages. The Si5338 provides low-jitter frequency synthesis in a

space-saving 4 x 4 mm QFN package. The device is programmable via an I2C/

SMBus-compatible serial interface and supports operation from a 1.8, 2.5, or

3.3 V core supply. I2C device programming is made easy with the ClockBuilder™

Desktop software available at www.silabs.com/ClockBuilder.

Rev. 0.6 9/10

Copyright © 2010 by Silicon Laboratories

Si5338

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