SI5321-H-BL

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5321-H-BL is a low-jitter, high-performance clock generator designed for demanding digital applications. It features an integrated voltage-controlled crystal oscillator (VCXO) and a phase-locked loop (PLL) synthesizer. The device accepts a single-ended or differential reference input and generates multiple differential LVDS outputs with ultra-low additive jitter. Key electrical specifications include a supply voltage range of 3.0V to 3.6V, typical output swing of 800mVpp, and propagation delay characteristics suitable for high-speed data transmission systems requiring precise clock synchronization.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrated VCXO with external tuning capability for frequency adjustment
• Ultra-low additive RMS jitter performance (< 1 ps typical)
• Multiple differential LVDS output pairs for driving high-speed loads
• Single-ended or differential reference input compatibility

Clock Generators, PLLs, Frequency Synthesizers Applications

• High-speed serial transceivers (SerDes) clocking
• Telecommunications infrastructure equipment
• Data center interconnects and server boards
• Test and measurement instrumentation

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific suffix codes against the manufacturer's official datasheet to confirm pinout, package type, and electrical tolerances. Ensure the reference clock source matches the input requirements specified in the technical documentation. Confirm RoHS compliance status if required by the procurement specification. Cross-reference the part number with authorized distributors to ensure authenticity and traceability.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when ultra-low jitter is critical for system bit error rate performance. Evaluate the available reference clock frequencies to ensure they fall within the PLL's lock range. Consider the power supply noise sensitivity and implement appropriate decoupling as recommended in the layout guidelines. Verify that the output load capacitance does not exceed the drive capability limits of the LVDS outputs.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The SI5321 series belongs to Skyworks' portfolio of precision clock generators. The 'H' designation typically indicates a specific temperature grade or performance bin within the family. This model is distinct from simpler oscillators due to its programmable PLL architecture and integrated VCXO, offering flexibility in frequency synthesis compared to fixed-frequency crystal oscillators.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements must match the LVDS output configuration and jitter specifications. Check for compatible packages such as QFN or SOIC variants from the same manufacturer. Alternative devices from other vendors require verification of pin-to-pin compatibility and electrical parameter equivalence, particularly regarding supply voltage and output swing.