SI5338B-B04871-GM

Overview

The SI5338B-B04871-GM is a programmable quad clock generator from Skyworks Solutions, utilizing MultiSynth technology for independent frequency synthesis on four output drivers. It supports any frequency up to 710 MHz with zero ppm precision and features low phase jitter of 0.7 ps RMS typical. The device accepts various input references including external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs (5–710 MHz). Outputs are configurable for LVPECL, LVDS, HCSL, CMOS, SSTL, or HSTL formats with independent supply voltages of 1.5, 1.8, 2.5, or 3.3 V per driver. It operates on a single core supply of 1.8, 2.5, or 3.3 V, drawing 45 mA typical current, within an operating temperature range of –40 to +85 °C in a 24-lead QFN package.

Feature Summary

• MultiSynth™ technology enables independent, any-frequency synthesis on four differential output drivers with 0 ppm precision.
• Low phase jitter of 0.7 ps RMS typical, compliant with PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS standards.
• Flexible input reference options: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz).
• Independent output voltage support (1.5, 1.8, 2.5, or 3.3 V) and glitchless frequency adjustment via independent increment/decrement feature.

Applications

• Ethernet switch/router timing
• PCIe Gen1/2/3/4 clocking
• Processor and FPGA clocking
• Broadcast video/audio timing
• Telecom line cards

Procurement Notes

Verify the specific ordering suffix B04871 against the manufacturer's latest datasheet to confirm pinout configuration and internal NVM programming. Ensure I2C pull-up voltages match the system requirements, noting that register adjustments may be necessary if the bus voltage is below 2.5 V. Confirm humidity sensitivity handling during assembly as indicated by the moisture sensitivity level.

Selection Notes

Select this component when designing systems requiring four independent clock outputs with varying frequencies and signal formats. Ensure the input reference source matches the supported frequency ranges for the chosen interface type. Verify that the required output voltage levels (LVPECL, LVDS, etc.) align with the available independent driver supplies. Consider the thermal resistance characteristics for PCB layout planning.

Part Context

This part belongs to the Si5338 family of high-performance, low-jitter clock generators. It is designed to replace multiple discrete crystal oscillators or function as a frequency translator. The device integrates a PLL and MultiSynth synthesizers to provide precise clock generation capabilities in a compact 4x4 mm QFN package, suitable for space-constrained applications.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Consult Skyworks Solutions for direct replacements or cross-references based on specific electrical and pinout requirements.