Overview
SI5338C-B-GMR is a highly flexible, low-jitter programmable clock generator launched by Silicon Labs, which can generate any frequency output in the range of 0.16 MHz to 350 MHz (LVPECL) or 0.16 MHz to 200 MHz (LVCMOS). The device adopts a single-chip architecture, integrates low phase noise PLL, EEPROM, 4 outputs, supports I²C real-time configuration or EEPROM power-on self-start configuration, and is widely used in communication equipment, video processing systems, industrial control, FPGA/SoC system clock tree and other fields.
Specifications
Parameter | Numeric |
Output frequency range | 0.16 MHz – 350 MHz (Differential) |
Number of output channels | 4-way |
Output Format | LVPECL, LVDS, HCSL, LVCMOS (configurable) |
Input frequency range | 10 MHz – 710 MHz (differential) |
Input reference source | Crystal, LVCMOS, differential clock |
Configuration | EEPROM self-boot + I²C real-time configuration |
RMS Phase Jitter (12kHz–20MHz) | 0.3 ps (typical) |
Supply voltage | 3.3V |
Package Type | 20-pin QFN (3 mm × 3 mm) |
Operating temperature range | -40°C to +85°C (Industrial Grade) |
Key Features of SI5338C-B-GMR
Any-Frequency Technology
Supporting continuous frequency output configurations from 0.16MHz to 350MHz, users can generate precise frequencies based on system requirements without using multiple fixed-frequency crystals.
Supports multiple output formats, suitable for a wide range of applications
Each channel can be independently configured as LVPECL, LVDS, HCSL or LVCMOS output to adapt to the clock input requirements of different platforms, such as FPGA, ASIC, processor, etc.
Integrated EEPROM, supports plug and play
Built-in non-volatile EEPROM can store configuration data, realize automatic loading of clock configuration at power-on, support independent startup without MCU; it can also be reconfigured in real time through I²C.
Ultra-low phase jitter, suitable for high-performance systems
The typical phase jitter is only 0.3ps RMS (12kHz – 20MHz), meeting the strict jitter requirements of high-speed interfaces (such as PCIe, Gigabit Ethernet).
Flexible input reference sources
Supports crystal, LVCMOS or differential clock as reference input, facilitating the integration of multiple clock references in embedded systems.
Industrial-grade reliability and small package
It adopts 3mm × 3mm QFN package and supports -40°C to +85°C industrial temperature range, suitable for space-constrained and temperature-critical industrial and communication applications.
Application Areas
The high flexibility and low jitter characteristics of SI5338C-B-GMR make it widely applicable to:
Communication System
Used for clock synthesis, rate matching and interface synchronization (such as 10G/40G networks, optical transmission systems).
FPGA / SoC Clock Tree Generation
Provides precise low jitter clocks to multiple frequency subsystems such as DDR, ADC/DAC, CPU and bus clocks.
Industrial Control Systems
Used for high reliability, low latency synchronous signal processing, PLC, motion controller and other systems.
Audio and video processing equipment
Meet the video/audio synchronization clock requirements of HDMI, SDI, USB Audio, etc. and improve signal quality.
Test and measurement equipment
Provides a highly stable test reference clock or swept frequency signal source, suitable for oscilloscopes, spectrum analyzers, signal generators, etc.
Comparative Analysis: SI5338C-B-GMR and Traditional Clock Generators
Features/Specifications | SI5338C-B-GMR | Fixed frequency crystal oscillator + divider solution |
Output frequency range | Any frequency (0.16MHz–350MHz) | Limited by crystal frequency and division ratio |
Output Format | Multiple programmable (LVDS/PECL, etc.) | Fixed output type |
Number of output channels | 4 independent configurable | Usually only 1 |
Jitter performance | As low as 0.3ps RMS | Large jitter and uncertain performance |
Configuration | EEPROM + I²C | Cannot be configured or requires external logic switching |
Package size | QFN 3x3mm | Large or irregular package |
SI5338C-B-GMR provides a flexible and programmable clock solution, reduces the number of materials and improves system integration. It is the preferred device for building low-cost, low-power, and multi-functional clock architectures in modern electronic systems.
Manufacturer introduction: Silicon Labs
Silicon Labs is a world-renowned supplier of high-performance clock and frequency synthesizers, focusing on low-jitter clock management , wireless connectivity and industrial control solutions. The SI5338 series is its representative product, which is widely used in communications, industry, data centers and embedded systems to help customers solve complex clock design challenges.
Why choose SI5338C-B-GMR?
● Any frequency output, accurately matching system requirements
● Multi-channel, multi-format flexible configuration, simplifying BOM and PCB wiring
● Built-in EEPROM, supports master-free power-on startup
● As low as 0.3ps phase jitter, meeting high-speed interface requirements
● Support I²C dynamic configuration, easy system debugging and hot update
● Industrial temperature support + compact package, suitable for harsh environments
FAQ
Q1: Does the SI5338C-B-GMR require an external crystal?
A: Optional. The SI5338C-B-GMR supports a variety of reference source types, including an external crystal (recommended frequency is 25MHz), LVCMOS clock, or differential clock signals (such as LVPECL, LVDS, or HCSL). Whether an external crystal is required depends on the system design and reference clock availability. If full stand-alone operation is required and no other clock source is available in the system, an external crystal is recommended to ensure stability and self-start capability.
Q2: How to configure the frequency output?
A: SI5338C-B-GMR supports flexible frequency configuration, which can be achieved through the ClockBuilder Pro tool provided by Silicon Labs. Users can set the required output frequency, reference source, output format and other parameters in the software. After the configuration is completed, the result can be directly burned to the on-chip EEPROM to achieve power-on and run; it can also be dynamically loaded through the I²C interface when the system is running, which is convenient for flexible adjustment of application requirements. ClockBuilder Pro also supports spectrum simulation and jitter analysis to optimize system performance.
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