SI5338C-B05628-GMR

Overview

The SI5338C-B05628-GMR is a programmable quad clock generator from Skyworks Solutions, utilizing MultiSynth technology to synthesize any frequency on four independent output drivers with zero ppm precision. It operates from a single core supply of 1.8 V, 2.5 V, or 3.3 V and supports flexible input references including external crystals (8–30 MHz), CMOS (up to 200 MHz), SSTL/HSTL (up to 350 MHz), and differential inputs (up to 710 MHz). The device features low phase jitter of 0.7 ps RMS typical, glitchless frequency adjustments in 1 ppm steps, and independent phase adjustment per driver. It is housed in a compact 4 x 4 mm 24-QFN package.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four differential output drivers with true zero ppm accuracy.
• Supports highly configurable output formats including LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL with independent voltage levels (1.5, 1.8, 2.5, or 3.3 V).
• Features glitchless frequency increment/decrement in 1 ppm steps and independent phase adjustment with <20 ps resolution.
• Includes flexible spread spectrum generation with adjustable deviation (0.5% to 5.0%) and modulation rates (33 to 63 kHz).

Applications

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

Procurement Notes

Verify the specific factory configuration code embedded in the suffix B05628 against the official Skyworks ordering guide to ensure the correct pre-programmed frequencies and settings are delivered. Confirm that the GMR suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly processes.

Selection Notes

Select this component when replacing multiple discrete crystal oscillators with a single low-jitter synthesizer. Ensure the required output signal formats and frequencies fall within the supported ranges: LVPECL/LVDS up to 710 MHz, HCSL up to 250 MHz, and CMOS/SSTL/HSTL up to 350 MHz. Verify that the I2C interface compatibility matches the system controller's bus specifications.

Part Context

This part belongs to the Si5338 family of I2C-programmable clock generators. The 'C' typically denotes commercial temperature range (-40°C to +85°C), while 'B' indicates a specific factory programming configuration. The 'GMR' suffix specifies green lead-free tape and reel packaging. This model serves as a direct replacement for fixed-frequency oscillators in high-speed digital designs requiring precise clock distribution.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. When replacing discrete oscillators, verify pinout compatibility and thermal characteristics, as the Si5338 requires a 4x4 mm QFN footprint.