Datasheet Si5351 (Skyworks) - 2

Si5351A/B/C-B Functional Block Diagrams Si5351A (20-QFN)
VDDOA MultiSynth XA PLL R0 0 CLK0 OSC A XB MultiSynth R1 CLK1 1 VDDOB PLL MultiSynth R2 B 2 CLK2 MultiSynth R3 CLK3 3 A0 VDDOC MultiSynth R4 SDA I2C 4 CLK4 MultiSynth SCL R5 CLK5 5 VDDOD MultiSynth R6 OEB Control 6 CLK6 Logic MultiSynth SSEN R7 CLK7 7
Si5351B (20-QFN)
VDDOA MultiSynth XA R0 0 CLK0 OSC PLL MultiSynth CLK1 XB R1 1 VDDOB VCXO MultiSynth R2 2 CLK2 VC MultiSynth R3 CLK3 3 VDDOC MultiSynth R4 SDA 4 CLK4 I2C MultiSynth SCL R5 CLK5 5 VDDOD MultiSynth OEB R6 Control 6 CLK6 Logic SSEN MultiSynth R7 CLK7 7 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com Rev. 1.3 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • August 27, 2021 Document Outline 1. Ordering Guide 2. Technical Support Resources 3. Electrical Specifications 4. Functional Description 4.1. Input Stage 4.1.1. Crystal Inputs (XA, XB) 4.1.2. External Clock Input (CLKIN) 4.1.3. Voltage Control Input (VC) 4.2. Synthesis Stages 4.3. Output Stage 4.4. Spread Spectrum 4.5. Control Pins (OEB, SSEN) 4.5.1. Output Enable (OEB) 4.5.2. Spread Spectrum Enable (SSEN)—Si5351A and Si5351B Only 4.6. Status Pins (INTR) 5. I2C Interface 6. Configuring the Si5351 6.1. Writing a Custom Configuration to RAM 6.2. Si5351 Application Examples 6.3. Replacing Crystals and Crystal Oscillators 6.4. Replacing Crystals, Crystal Oscillators, and VCXOs 6.5. Replacing Crystals, Crystal Oscillators, and PLLs 6.6. Applying a Reference Clock at XTAL Input 6.7. HCSL Compatible Outputs 7. Design Considerations 7.1. Power Supply Decoupling/Filtering 7.2. Power Supply Sequencing 7.3. External Crystal 7.4. External Crystal Load Capacitors 7.5. Unused Pins 7.6. Trace Characteristics 8. Register Map Summary 9. Register Descriptions 10. Si5351 Pin Descriptions 10.1. Si5351A 20-pin QFN 10.2. Si5351B 20-Pin QFN 10.3. Si5351C 20-Pin QFN 10.4. Si5351A 16-Pin QFN 10.5. Si5351B 16-Pin QFN 10.6. Si5351C 16-Pin QFN 10.7. Si5351A 10-Pin MSOP 11. Ordering Information 12. Packaging 12.1. 20-pin QFN Package Outline 12.2. Land Pattern: 20-Pin QFN 12.3. 16-Pin QFN Package Outline 12.4. Land Pattern: 16-Pin QFN 12.5. 10-Pin MSOP Package Outline 12.6. Land Pattern: 10-Pin MSOP 13. Top Marking 13.1. 20-Pin QFN Top Marking 13.2. Top Marking Explanation 13.3. 16-Pin QFN Top Marking 13.4. Top Marking Explanation 13.5. 10-Pin MSOP Top Marking 13.6. Top Marking Explanation Revision History