SI5338J-B04982-GMR

Overview

The SI5338J-B04982-GMR is a programmable quad clock generator utilizing Skyworks MultiSynth technology. It synthesizes any frequency on four independent output drivers with zero ppm accuracy. The device supports flexible input references, including differential inputs up to 710 MHz and single-ended CMOS inputs up to 200 MHz. Output formats include LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL, with individual supply voltages of 1.5, 1.8, 2.5, or 3.3 V per driver. It features low phase jitter (0.7 ps RMS typ), glitchless frequency adjustment in 1 ppm steps, and configurable spread spectrum modulation. Programming is performed via an I2C/SMBus interface.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four differential output drivers with true zero ppm accuracy.
• Low phase jitter of 0.7 ps RMS typical, compliant with PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS standards.
• Highly-configurable output drivers supporting LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats with independent voltage levels.
• Independent frequency increment/decrement feature allows glitchless adjustments in 1 ppm steps; independent phase adjustment with <20 ps steps.

Applications

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

Procurement Notes

Verify the specific ordering suffix B04982 against the manufacturer's current documentation to confirm factory-programmed register settings. Confirm package type is 24-QFN and operating temperature range is -40 to +85 °C. Ensure I2C pull-up voltages match system requirements, noting compatibility adjustments for voltages below 2.5 V.

Selection Notes

Select this component when multiple independent clock frequencies are required from a single source. Verify that the desired output frequencies fall within the supported ranges for the chosen format (e.g., LVDS up to 710 MHz, CMOS up to 200 MHz). Check if the application requires specific jitter performance metrics such as PCIe compliance or GbE random jitter limits.

Part Context

This part belongs to the Si5338 family of I2C-programmable any-frequency, any-output quad clock generators. It replaces discrete crystal oscillators and operates as a frequency translator. The device integrates a PLL and MultiSynth stages to generate precise clocks from various reference inputs, packaged in a compact 4 x 4 mm QFN.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult Skyworks Solutions for cross-reference information regarding legacy parts or alternative packages within the Si533x family.

FAQ

What is the maximum input frequency for differential inputs?

The maximum input frequency for differential inputs (pins IN1/2, IN5/6) is 710 MHz.

Can the output supply voltages be different for each driver?

Yes, each output driver can be independently configured to support supply voltages of 1.5, 1.8, 2.5, or 3.3 V.

How is glitchless frequency adjustment achieved?

The device features an independent frequency increment/decrement capability that enables glitchless frequency adjustments in 1 ppm steps.