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SI5338A-B-GM

SiLSI5338A-B-GM

Silicon Labs
Highly configurable PLL-based clock chip with multiple outputs and advanced jitter management for complex timing architectures.
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Overview

The SI5338A-B-GM is a highly flexible, I2C-programmable clock generator capable of synthesizing any frequency up to 710 MHz on each of its four differential outputs. Utilizing Silicon Labs proprietary MultiSynth technology, it provides high-precision clock synthesis with 0.7 ps RMS phase jitter, making it suitable for demanding timing architectures.

Why Choose This Part

This device eliminates the need for multiple discrete crystal oscillators by providing four independent, frequency-agile outputs in a compact 4x4 mm QFN package. It supports a wide operating voltage range from 1.71V to 3.63V and features independent output voltage levels per driver, simplifying integration in multi-rail digital systems.

Applications

PCI Express Timing
Fully compliant with PCIe Gen 1, 2, 3, and 4 common clock requirements, as well as Gen 3 SRNS specifications.
Ethernet Switch and Router Clocks
Provides multiple low-jitter synchronous clocks for high-speed networking equipment and data center infrastructure.
Broadcast Video Systems
Generates precise reference frequencies for high-definition video processing and transmission hardware.
FPGA and Processor Clocking
Replaces multiple crystal oscillators with a single chip to provide diverse clock frequencies for high-performance SoCs and FPGAs.

Key Specifications

PLL Yes
Input CML, CMOS, HCSL, HSCL, HSTL, LVDS, LVPECL, SSTL, Crystal
Output HCSL, HSTL, LVCMOS, LVDS, LVPECL, SSTL
Main Purpose Ethernet, Fibre Channel, PCI Express (PCIe), Telecom
Mounting Type Surface Mount
Package / Case 24-VFQFN Exposed Pad
Frequency - Max 710MHz
Voltage - Supply 1.71V ~ 3.63V
Number of Circuits 1
Ratio - Input:Output 3:4
Operating Temperature -40degC ~ 85degC
Supplier Device Package 24-QFN (4x4)
Differential - Input:Output Yes/Yes

Getting Started

Engineers should use the ClockBuilder Pro software to configure the internal registers and generate custom frequency plans. For hardware evaluation and rapid prototyping, the Si5338-EVB evaluation board provides a convenient platform to test the I2C interface and verify output signal integrity.

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