SI5338G-B-GM

Overview

The SI5338G-B-GM is a programmable quad clock generator from Skyworks Solutions, utilizing MultiSynth technology to synthesize any frequency on four independent output drivers. It supports differential and single-ended outputs including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL. The device operates with core supply voltages of 1.8 V, 2.5 V, or 3.3 V and features low phase jitter of 0.7 ps RMS typical. Input references include external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs up to 710 MHz.

Feature Summary

• MultiSynth™ technology enables independent, any-frequency synthesis with zero ppm accuracy on four output drivers.
• Supports highly configurable output formats: LVPECL/LVDS/CML (up to 710 MHz), HCSL (up to 250 MHz), CMOS (up to 200 MHz), and SSTL/HSTL (up to 350 MHz).
• Features independent output voltage selection per driver (1.5, 1.8, 2.5, or 3.3 V) and glitchless frequency adjustments in 1 ppm steps.
• Includes configurable spread spectrum generation with frequencies from 5 to 350 MHz and modulation rates from 33 to 63 kHz.

Applications

• PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS compliant systems
• Ethernet switch/router and 1 GbE/10 GbE interfaces
• Processor and FPGA clocking solutions
• Broadcast video/audio timing applications

Procurement Notes

Verify the specific suffix 'B' against the manufacturer's current ordering guide to confirm factory-programmed NVM content and pinout configuration. Confirm package availability as distribution status may vary. Ensure I2C pull-up voltages match the system design, noting that register writes may be required if bus voltage is below 2.5 V.

Selection Notes

Select this component for designs requiring flexible clock synthesis across mixed signal formats and voltages. Ensure input reference frequencies fall within supported ranges: differential up to 710 MHz, CMOS up to 200 MHz, and crystal oscillators between 8 and 30 MHz. Validate thermal performance using the specified junction-to-ambient resistance of 37 °C/W under still air conditions.

Part Context

The SI5338 series replaces multiple discrete crystal oscillators with a single integrated solution. The 'G' variant typically denotes a specific output configuration or speed grade within the family, while 'GM' indicates the 24-lead QFN package. This part belongs to the broader Si533x family designed for low-power, high-performance clock generation in telecom and computing infrastructure.

Replacement Considerations

Direct replacements within the same family include other SI5338 variants with different output configurations or frequency ranges. Verify compatibility by comparing output driver types, maximum frequencies, and package dimensions. Consult the manufacturer's cross-reference tools for confirmed substitutes with identical electrical characteristics.