DATA SHEETSKY53510/SKY53580/SKY535401.3. SKY53540 5x5 mm 32-QFN Pin Descriptions T1 C U EF UT R O b O _ D O D 1 K 1 K SF OE VD REF VD CL CL NC 3231302928272625 GND 124 GND VDDOA 223 VDDOB Q0 322 Q2 Q0b 421 Q2b VDDOA 520 VDDOB Q1 619 Q3 Q1b 718 Q3b GND 817 GND 910111213141516 0 b T0 D XA XB K 0 U VD K SEL1 O SEL0 _ CL CL _ K SF K CL CL Figure 4. SKY53540 5x5 mm 32-QFN PinoutTable 3. SKY53540 5x5 mm 32-QFN Pin DescriptionsPinNameType1Description 1 GND GND Ground. 2 VDDOA P Output voltage supply-Bank A (Outputs: Q0 to Q1). Bypass with 0.1 µF capacitor and place as close to the VDDOA pin as possible. 3 Q0 O Output clock 0. 4 Q0b O Output clock 0 (complement). Output voltage supply-Bank A (Outputs: Q0 to Q1). 5 VDDOA P Bypass with 1.0 µF capacitor and place as close to the VDDOA pin as possible. 6 Q1 O Output clock 1. 7 Q1b O Output clock 1 (complement). 8 GND GND Ground. Output signal format control pin for Bank A and Bank B. 9 SFOUT0 I SFOUT0 contains an internal pull-down resistor. Core voltage supply. 10 VDD P Bypass with 0.1 µF capacitor placed as close to the VDD pin as possible. 11 XA I Crystal input. Can also be driven by a XO, TCXO, or other external single-ended clock. 12 XB O Crystal output. When a crystal is not used and XA is used as an input, this pin should be left floating. 13 CLK_SEL0 I Mux input select pin. CLK_SEL0 contains an internal pull-down resistor. 14 CLK0 I Input clock 0. Skyworks Solutions, Inc. • Phone [949] 231-3000 • sales@skyworksinc.com • www.skyworksinc.com 207106A • Skyworks Proprietary Information • Products and Product Information are Subject to Change without Notice 8 August 1, 2025 Document Outline Key Features 1. Pin Descriptions 1.1. SKY53510 7x7 mm 48-QFN Pin Descriptions 1.2. SKY53580 6x6 mm 40-QFN Pin Descriptions 1.3. SKY53540 5x5 mm 32-QFN Pin Descriptions 2. Detailed Description 2.1. Overview 2.2. Block Diagrams 2.3. Modes of Operation 2.3.1. Input Clock Stage 2.3.2. Clock Outputs 3. Applications Information 3.1. Driving Clock Inputs (CLK0/CLK1) 3.2. Crystal Interface (XA/XB) 3.3. Clock Output Termination 3.3.1. DC-Coupled Differential Output Driver Terminations 3.3.2. AC-Coupled Differential Output Driver Terminations 4. Power Supply (VDD and VDDOx) 4.1. Power Supply Sequencing 5. Electrical Specifications 6. Typical Performance Characteristics 7. Package and Handling Information 7.1. 48-QFN Package Diagram 7.2. 40-QFN Package Diagram 7.3. 32-QFN Package Diagram 8. Land Patterns 8.1. 48-QFN Land Pattern 8.2. 40-QFN Land Pattern 8.3. 32-QFN Land Pattern 9. Top Markings 9.1. SKY53510/80/40 Top Markings 10. Ordering Guide 11. Revision History