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Description

The Si5338 is a high-performance, low-jitter clock generator capable of synthesizing any frequency on each of the devices 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.

Features

■ Low power MultiSynth? technology enables independent, any-frequency synthesis on four differential output drivers

■ Highly-configurable output drivers with up to four differential outputs, eight single-ended clock outputs, or a combination of both

■ Low phase jitter of 0.7 ps RMS typ

■ High precision synthesis allows true zero ppm frequency accuracy on all outputs

■ Flexible input reference:

● External crystal: 8 to 30 MHz

● CMOS input: 5 to 200 MHz

● SSTL/HSTL input: 5 to 350 MHz

● Differential input: 5 to 710 MHz

■ Independently configurable outputs support any frequency or format:

● LVPECL/LVDS: 0.16 to 710 MHz

● HCSL: 0.16 to 250 MHz

● CMOS: 0.16 to 200 MHz

● SSTL/HSTL: 0.16 to 350 MHz

■ Independent output voltage per driver: 1.5, 1.8, 2.5, or 3.3 V

■ Single supply core with excellent PSRR: 1.8, 2.5, 3.3 V

■ Independent frequency increment/decrement feature enables glitchless frequency adjustments in 1 ppm steps

■ Independent phase adjustment on each of the output drivers with an accuracy of <20 ps steps

■ Highly configurable spread spectrum (SSC) on any output:

● Any frequency from 5 to 350 MHz

● Any spread from 0.5 to 5.0

● Any modulation rate from 33 to 63 kHz

■ External feedback mode allows zero-delay mode

■ Loss of lock and loss of signal alarms

■ I2C/SMBus compatible interface

■ Easy to use programming software

■ Small size: 4 x 4 mm, 24-QFN

■ Low power: 45 mA core supply typ

■ Wide temperature range: –40 to +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