SI5351B-B13189-GM1R

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5351B-B13189-GM1R is an I2C-programmable CMOS clock generator featuring an integrated VCXO. It generates up to eight 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 2.5 V or 3.3 V and output supplies of 1.8, 2.5, or 3.3 V. It utilizes a 25 or 27 MHz crystal reference and delivers low period jitter typically under 70 ps peak-to-peak. Factory preprogrammed for specific frequency plans, it replaces crystals, oscillators, and PLLs in space-constrained designs.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates a highly linear VCXO to eliminate the need for custom pullable crystals while supporting synchronous clock generation.
• Provides glitchless frequency changes and configurable spread spectrum modulation selectable at each individual output.
• Features separate voltage supply pins for level translation between core logic and output buffers.
• Supports static phase offset programming and adjustable output delay for precise timing alignment.

Clock Generators, PLLs, Frequency Synthesizers Applications

• Replacing traditional crystals, crystal oscillators, and VCXOs in cost-sensitive designs
• Networking and communication equipment requiring multiple clock domains
• Servers and storage systems needing low jitter synchronization
• Residential gateways and handheld instrumentation

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the factory preprogrammed configuration code '13189' matches the required frequency plan before integration. Confirm that the specific package variant aligns with the target PCB footprint. Ensure the design supports the necessary I2C interface for any potential runtime reconfiguration if the device allows RAM updates.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when both free-running asynchronous clocks and synchronous VCXO-controlled outputs are required within a single component. It is suitable for applications demanding exact frequency synthesis without external pullable crystals. Consider the 20-QFN package for maximum output flexibility or smaller packages if pin count requirements are lower.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5351 family, which includes variants A, B, and C. The Si5351B specifically adds the VCXO capability found in the Si5351A/B/C series. The suffix indicates a factory preprogrammed unit, distinguishing it from blank devices intended for user configuration via ClockBuilder Pro software.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.