SI5351B-B I2C Clock Generator: Pinout, Features and Datasheet

Pinout

PCB Symbol

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3D Model

The Si5351 is an I²C configurable clock generator that is ideally suited for replacing crystals, crystal oscillators, VCXOs, phase-locked loops (PLLs), and fanout buffers in cost-sensitive applications. Based on a PLL/VCXO + high resolution MultiSynth fractional divider architecture, the Si5351 can generate any frequency up to 200 MHz on each of its outputs with 0 ppm error. Three versions of the Si5351 are available to meet a wide variety of applications. The Si5351A generates up to 8 free-running clocks using an internal oscillator for replacing crystals and crystal oscillators. The Si5351B adds an internal VCXO and provides the flexibility to replace both free-running clocks and synchronous clocks. It eliminates the need for higher cost, custom pullable crystals while providing reliable operation over a wide tuning range. The Si5351C offers the same flexibility but synchronizes to an external reference clock (CLKIN).

This article provides you with a basic overview of the SI5351B-B I²C Clock Generator, including its pin descriptions, features and specifications, etc., to help you quickly understand what SI5351B-B is.

● Generates up to eight non-integerrelated frequencies from 2.5 kHz to 200 MHz

● I²C user definable configuration

● Exact frequency synthesis at each output (0 ppm error)

● Highly linear VCXO

● Optional clock input (CLKIN)

● Low output period jitter: < 70 ps pp, typ

● Configurable spread spectrum selectable at each output

● Operates from a low-cost, fixed frequency crystal: 25 or 27 MHz

● Supports static phase offset

● Programmable rise/fall time control

● Glitchless frequency changes

● Separate voltage supply pins provide level translation:

● Core VDD: 2.5 or 3.3 V

● Output VDDO: 1.8, 2.5, or 3.3 V

● Excellent PSRR eliminates external power supply filtering

● Very low power consumption

● Adjustable output delay

● Available in three packages types:

   ◆ 10-MSOP: 3 outputs

   ◆ 16-QFN (3x3 mm): 4 outputs

   ◆ 20-QFN (4x4 mm): 8 outputs

● PCIE Gen 1 compatible

● Supports HCSL compatible swing

Silicon Labs SI5351B-B-GM technical specifications, attributes, parameters and parts with similar specifications to Silicon Labs SI5351B-B-GM.

Si5351B (20-QFN) Functional Block Diagram

Si5351 Block Diagram

Si5351 Memory Configuration

● Audio/video equipment, gaming

● Printers, scanners, projectors

● Handheld Instrumentation

● Laser range finder

● Residential gateways

● Networking/communication

● Servers, storage

● XO replacement 

20-pin QFN Package Outline

20-Pin QFN Land Pattern

20-Pin QFN Top Marking

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