High-Performance Low-Jitter Clock Generator

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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.

Symmetry Electronics is an authorized Silicon Labs distributor.


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Low power MultiSynth technology enables independent, any-frequency synthesis on four differential output drivers
PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS compliant
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
IC/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

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High-Performance Low-Jitter Clock Generator