SI5338C-B05953-GMR

Overview

The SI5338C-B05953-GMR is an I2C-programmable quad clock generator from Skyworks Solutions. It utilizes MultiSynth technology to synthesize any frequency on four independent output drivers with zero ppm precision. The device supports flexible input references, including external crystals (8–30 MHz), CMOS (up to 200 MHz), and differential inputs (up to 710 MHz). Outputs are configurable for various signal formats such as LVPECL, LVDS, HCSL, and CMOS, with independent supply voltages of 1.5, 1.8, 2.5, or 3.3 V per driver. It operates from a single core supply of 1.8, 2.5, or 3.3 V, features low phase jitter of 0.7 ps RMS typical, and is housed in a compact 4x4 mm QFN-24 package.

Feature Summary

• Four independent output drivers capable of synthesizing any frequency with 0 ppm accuracy using MultiSynth technology
• Flexible input support for external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential signals (5–710 MHz)
• Configurable output formats including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL with independent voltage levels
• Glitchless frequency adjustment via independent increment/decrement features and programmable spread spectrum

Applications

• PCIe Gen 1/2/3/4 common clock and SRNS compliant timing
• Ethernet switch/router and 1 GbE/10 GbE interfaces
• Processor and FPGA clocking systems
• Broadcast video/audio timing distribution
• Telecom line cards and MSAN/DSLAM/PON equipment

Procurement Notes

Verify the specific ordering suffix B05953 against the manufacturer's current datasheet to confirm factory-programmed frequency settings. Ensure the I2C pull-up voltage compatibility matches the system bus requirements, particularly if operating below 2.5 V. Confirm that the QFN-24 thermal pad soldering process adheres to recommended PCB land patterns to maintain thermal performance within the specified junction temperature limits.

Selection Notes

Select this component when replacing multiple discrete oscillators with a single programmable source. Ensure the required output frequencies fall within the supported ranges for the chosen signal format, noting that frequencies above 350 MHz are limited to specific divisors. Verify that the input reference source matches the compatible pin configurations (IN1/2/5/6 for differential, IN3/4 for single-ended) and that the power budget accommodates the maximum core and output buffer currents.

Part Context

This part belongs to the Si5338 family of low-jitter clock generators. The 'C' designation typically indicates commercial temperature range operation (-40°C to +85°C), while the 'GMR' suffix denotes tape and reel packaging. The base Si5338 architecture allows for high flexibility in clock generation, serving as a central timing hub for complex digital systems requiring multiple synchronized clocks derived from a single reference.

Replacement Considerations

Direct pin-to-pin replacements within the same family include other Si5338 variants with different pre-programmed frequencies or temperature grades. When substituting, ensure the new part supports the required output formats and frequencies. If the original part was field-programmable, a fixed-frequency variant may require verification that the hardcoded frequencies match the design specifications exactly.