SI5351B-B05641-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5351B-B05641-GMR is an I2C-programmable CMOS clock generator featuring a VCXO reference and eight LVCMOS outputs. It generates non-integer-related frequencies from 2.5 kHz to 200 MHz with 0 ppm error using MultiSynth fractional dividers. The device operates on a core supply of 2.25 V to 3.6 V and output supplies of 1.71 V to 3.6 V, consuming up to 27 mA. It utilizes a standard 25 or 27 MHz crystal and provides low period jitter under 70 ps peak-to-peak. The component is housed in a 20-QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates up to eight independent non-integer-related frequencies
• Includes integrated VCXO for synchronous clock generation without pullable crystals
• Supports configurable spread spectrum modulation at each output
• Provides glitchless frequency changes and adjustable output delays

Clock Generators, PLLs, Frequency Synthesizers Applications

• Replacing crystals, crystal oscillators, and VCXOs
• Networking and communication equipment
• Servers and storage systems
• Printers, scanners, and projectors

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the factory preprogrammed configuration code '05641' matches the required clock frequencies before procurement. Confirm that the GMR suffix indicates tape and reel packaging suitable for automated assembly processes. Ensure the specific B variant requirements align with the design's need for VCXO functionality.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when both free-running asynchronous clocks and synchronized VCXO-based outputs are required within a single device. It serves as a direct replacement for multiple discrete components including XOs, PLLs, and fanout buffers. Verify that the 20-QFN package dimensions fit the available PCB space constraints.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5351 family of programmable clock generators manufactured by Skyworks Solutions. The 'B' designation specifically denotes the inclusion of an internal Voltage Controlled Crystal Oscillator (VCXO), distinguishing it from the A and C variants which lack this feature.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct functional replacements include other Si5351B variants with different factory programming codes. For designs requiring identical electrical characteristics but different packaging, verify availability in QFN-16 or MSOP-10 formats if fewer outputs are sufficient.

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency supported by the Si5351B?

The device supports generating output frequencies up to 200 MHz.

How does the Si5351B handle frequency synthesis error?

It achieves exact frequency synthesis at each output with 0 ppm error using its MultiSynth architecture.

Can the Si5351B generate synchronous and asynchronous clocks simultaneously?

Yes, it can generate both types of clocks by utilizing its dual PLL structure and crosspoint switches.