SI5338L-B05947-GM

Overview

The SI5338L-B05947-GM is a programmable quad clock generator from Skyworks Solutions, utilizing MultiSynth technology for independent frequency synthesis on four output drivers. It supports differential and single-ended outputs with frequencies up to 710 MHz. The device operates on a single core supply of 1.8 V, 2.5 V, or 3.3 V and features low phase jitter of 0.7 ps RMS typical. Configuration is managed via an I²C/SMBus interface, allowing precise control over frequency, phase, and spread spectrum modulation.

Feature Summary

• MultiSynth™ technology enables independent, any-frequency synthesis on four output drivers with 0 ppm precision.
• Supports flexible input references including external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs (5–710 MHz).
• Highly configurable output drivers support LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats with independent voltage levels (1.5, 1.8, 2.5, or 3.3 V).
• Features glitchless frequency adjustments in 1 ppm steps and independent phase adjustment with <20 ps accuracy.

Applications

• PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS compliant systems.
• Ethernet switch/router and 1 GbE/10 GbE networking equipment.
• Processor and FPGA clocking solutions.
• Broadcast video/audio timing infrastructure.
• Telecom line cards and MSAN/DSLAM/PON applications.

Procurement Notes

Verify the specific factory-programmed configuration associated with the B05947 suffix against the target design requirements. Confirm that the QFN-24 package dimensions and thermal characteristics align with the PCB layout constraints. Ensure the I²C pull-up voltages are compatible with the system bus levels before integration.

Selection Notes

Select this component when independent clock synthesis with low jitter is required for multiple peripherals. Ensure the input reference source matches the supported frequency ranges for the chosen format. Verify that the output load capacitance and drive strength requirements are met by the selected output driver configurations.

Part Context

This part belongs to the Si5338 family of I²C-programmable clock generators. It replaces discrete crystal oscillators and frequency translators, consolidating timing functions into a single 4x4 mm QFN package. The device is designed to reduce board space and power consumption while maintaining high signal integrity across various digital interfaces.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Evaluate other Si5338 variants based on specific frequency and output format requirements if pin-compatible alternatives are needed.

FAQ

What is the maximum output frequency supported by the SI5338?

The device supports output frequencies up to 710 MHz for differential formats like LVPECL, LVDS, and CML. Single-ended formats such as CMOS have a lower maximum limit of 200 MHz.

How is the device configured?

The SI5338 is programmed via an I²C/SMBus-compatible serial interface. Skyworks provides ClockBuilder Pro software to simplify the configuration process.

Can the device operate without an external crystal?

Yes, the device accepts various input references including CMOS, SSTL/HSTL, and differential clock signals, eliminating the need for an external crystal in those configurations.