SI5338B-B11485-GMR

Overview

The SI5338B-B11485-GMR 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 differential clocks up to 710 MHz and single-ended CMOS/SSTL/HSTL inputs. Outputs are configurable for LVPECL, LVDS, HCSL, CMOS, SSTL, HSTL, or CML 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 within 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 performance 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).
• Independently configurable outputs support multiple signal formats (LVPECL/LVDS, HCSL, CMOS, SSTL/HSTL) and voltage levels.

Applications

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

Procurement Notes

Verify the specific ordering suffix B11485 against the manufacturer's current documentation to confirm factory programming parameters. Ensure compatibility with I2C/SMBus interface requirements and check for moisture sensitivity handling instructions during storage and assembly.

Selection Notes

Select this component when designing systems requiring four independent clock signals with precise frequency accuracy and low jitter. Consider the available input reference frequencies and required output signal formats (LVDS, LVPECL, etc.) to ensure the Si5338 configuration meets the target application's electrical specifications.

Part Context

The SI5338 series belongs to Skyworks' MultiSynth family of high-performance clock generators. This specific part number represents a pre-programmed variant designed to replace multiple discrete oscillators, offering space savings and design flexibility in compact 4x4 mm QFN packages.

Replacement Considerations

Direct replacements must match the 24-QFN package and I2C programmability. Verify that alternative devices support the same maximum input/output frequencies and jitter specifications required by the original design constraints.