SI5338B-B11485-GM

Overview

The SI5338B-B11485-GM is a programmable quad clock generator utilizing MultiSynth technology. It synthesizes any frequency up to 710 MHz with zero ppm accuracy on four independent outputs. The device supports differential and single-ended formats including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL. It operates from a 1.8 V, 2.5 V, or 3.3 V core supply with a typical current of 45 mA. Key electrical parameters include a maximum input frequency of 710 MHz, output frequencies ranging from 0.16 MHz to 710 MHz depending on format, and a typical phase jitter of 0.7 ps RMS.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four differential output drivers with true zero ppm precision.
• Supports flexible input references: 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 up to 710 MHz, HCSL up to 250 MHz, and CMOS/SSTL/HSTL up to 350 MHz.
• 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 timing
• Ethernet switch/router and 1 GbE/10 GbE interfaces
• Processor and FPGA clocking
• Broadcast video/audio timing

Procurement Notes

Verify the specific factory programming configuration associated with the B11485 suffix against the design requirements using Skyworks ClockBuilder Pro software. Confirm that the QFN-24 package dimensions and thermal characteristics meet the PCB layout constraints. Ensure I2C pull-up voltages are compatible with the selected core supply voltage.

Selection Notes

Select this component when independent frequency synthesis for multiple domains is required within a single footprint. The Si5338B variant supports high-speed differential outputs up to 710 MHz. Consider the power consumption of 45 mA typical core current and the need for an external crystal or reference clock source within the specified frequency ranges for the chosen application.

Part Context

This part belongs to the Si5338 family of I2C-programmable clock generators. The 'B' designation typically indicates specific performance or feature subsets within the series, while the alphanumeric suffix denotes custom factory programming. It replaces discrete crystal oscillators and buffers, consolidating functionality into a 4x4 mm QFN package.

Replacement Considerations

Direct pin-to-pin replacements within the same family include other Si5338 variants such as SI5338A or SI5338Q, provided their supported output frequency ranges and input configurations match the system requirements. Verify that the replacement part's factory-programmed NVM settings align with the original design specifications.