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SI5351B-B-GM1

SI5351B-B-GM1

Skyworks Solutions Inc.
Clock Generator, VCXO IC 200MHz 1 16-VFQFN Exposed Pad
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Overview

The SI5351B-B-GM1 is a highly flexible, I2C-programmable clock generator and VCXO designed to replace crystals and crystal oscillators in space-constrained designs. It features an integrated Voltage Controlled Crystal Oscillator (VCXO) and can synthesize up to 8 unique frequencies from 8 kHz to 200 MHz with 0 ppm error. The architecture utilizes a MultiSynth fractional divider to provide glitchless frequency changes and excellent jitter performance across multiple independent outputs.

Why Choose This Part

The SI5351B eliminates the need for expensive custom oscillators by using a low-cost 25 or 27 MHz crystal to generate any frequency up to 200 MHz. It offers excellent power supply rejection (PSRR), which simplifies PCB design by removing the requirement for dedicated external LDOs and discrete filtering. The part is highly power-efficient, drawing only 24mA with four outputs active and including separate voltage supply pins for easy level translation between 1.8V, 2.5V, and 3.3V logic.

Applications

Ethernet and Networking
Generating precise reference clocks for switches, routers, and PCIE Gen 1 compatible hardware.
Consumer Electronics
Replacing multiple discrete crystal oscillators in HDTVs, gaming consoles, and set-top boxes to reduce BOM cost.
Precision Frequency Synthesis
Using the 0 ppm synthesis capability for timing-critical digital signal processing and communication links.
Voltage-Controlled Timing
Utilizing the integrated VCXO for clock recovery or frequency synchronization in phase-locked loop applications.

Key Specifications

PLL Yes
Type Clock Generator, VCXO
Input Clock, Crystal
Output LVCMOS
Mounting Type Surface Mount
Package / Case 16-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 1:4
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 16-QFN (3x3)
Differential - Input:Output No/No

Getting Started

Configuration is handled via a standard I2C interface, allowing for in-system programming or factory pre-programming. Engineers typically use the Skyworks ClockBuilder Pro software to generate register maps and configuration files. For rapid prototyping, many use the SI5351A-B-EVB evaluation board to verify output performance and jitter specifications before committing to a final PCB layout.

Part of Si5351 Clock Generators family » SI5351B-B

SI5351B-B Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Type Input Voltage Number of Circuits Ratio - Input:Output Stock
SI5351B-B-GM1 (this part) VFQFN-16 Clock Generator, V.. Clock, Crystal 2.25V 1 1:4 —
SI5351B-B-GMR VFQFN-20 Clock Generator Crystal 1.71V 2 1:8 6,930
Also available as: SI5351B-B-GM

Also Consider

SI5351A-B-GT Skyworks Solutions Inc. - Standard version without the VCXO functionality for applications that only require a basic programmable clock generator.

Categories

Clocks & Timing > Clock Generators & PLLs Clocks & Timing