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SI5351B-B11531-GMR

SI5351B-B11531-GMR

Skyworks Solutions Inc.
Clock Generator, VCXO IC 200MHz 1 20-VFQFN Exposed Pad
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Overview

The SI5351B-B11531-GMR is an I2C-configurable clock generator and VCXO that leverages MultiSynth fractional divider technology to synthesize frequencies up to 200MHz. It allows for the generation of non-integer related frequencies with 0 ppm error across multiple outputs while maintaining a low period jitter of less than 70 ps peak-to-peak. This specific variant includes a highly linear VCXO for frequency pulling applications and operates across a wide supply voltage range of 1.71V to 3.6V.

Why Choose This Part

The MultiSynth architecture eliminates the need for multiple discrete crystals or VCXOs, reducing board space and BOM cost. It offers glitchless frequency changes and configurable spread spectrum to assist with EMI compliance. The device also features excellent PSRR, which minimizes the need for external power supply filtering components while consuming only 27 mA during typical 8-output operation.

Applications

PCIe Gen 1 Clocking
Providing stable, HCSL-compatible clock signals for peripheral component interconnect express applications.
Network Switches and Routers
Generating multiple independent, low-jitter system clocks from a single low-cost 25 MHz or 27 MHz crystal.
Frequency Pulling and Synchronization
Utilizing the integrated VCXO for fine-tuning output frequencies in response to an analog control voltage.
Level-Shifted Clock Distribution
Using separate voltage supply pins to provide automatic level translation between different system logic families.

Key Specifications

PLL Yes
Type Clock Generator, VCXO
Input Clock, Crystal
Output HCSL, LVCMOS
Mounting Type Surface Mount
Package / Case 20-VFQFN Exposed Pad
Frequency - Max 200MHz
Voltage - Supply 2.25V ~ 2.75V, 3V ~ 3.6V
Divider/Multiplier Yes/No
Number of Circuits 1
Ratio - Input:Output 1:8
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 20-QFN (4x4)
Differential - Input:Output No/No

Getting Started

Designers can use the Skyworks ClockBuilder Pro software to generate configuration files and register maps. For hardware evaluation, the Si5351-B-EVB evaluation board provides a platform to test custom frequency plans and output levels. High-speed layouts should prioritize short traces for the 25/27 MHz reference crystal and include 0.1uF decoupling capacitors at each VDD pin.

SI5351B-B11531 Family

Also available as: SI5351B-B11531-GM

Also Consider

Si5351A-B-GT Skyworks Solutions Inc. - Choose this version if a VCXO function is not required and a simpler 10-MSOP package is preferred for basic clock generation.
Si5338B Skyworks Solutions Inc. - Consider this for higher performance requirements needing up to 350MHz output and more complex differential signaling options.

Categories

Clocks & Timing > Clock Generators & PLLs Clocks & Timing