SI5338M-B04945-GM

Overview

The SI5338M-B04945-GM is a 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 differential and single-ended outputs, including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats. It operates from a single core supply of 1.8 V, 2.5 V, or 3.3 V and features low phase jitter of 0.7 ps RMS typical. Configuration is managed via an I2C/SMBus interface.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four output drivers with 0 ppm accuracy.
• Supports flexible input references: external crystals (8-30 MHz), CMOS (5-200 MHz), SSTL/HSTL (5-350 MHz), and differential inputs (5-710 MHz).
• Configurable output drivers support various signal formats and independent supply voltages (1.5, 1.8, 2.5, or 3.3 V).
• Features glitchless frequency adjustments in 1 ppm steps and independent phase adjustment with <20 ps resolution.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm pinout compatibility and factory programming settings. Ensure the I2C pull-up voltage aligns with the system bus requirements, as register configuration may be necessary for voltages below 2.5 V. Confirm moisture sensitivity levels and reflow soldering profiles during assembly planning.

Selection Notes

Select this component when designing systems requiring multiple independent clock frequencies from a single package. Verify that the required output frequencies fall within the supported ranges for the chosen output format (e.g., LVDS up to 710 MHz, CMOS up to 200 MHz). Ensure the input reference source matches the compatible input types listed in the specifications.

Part Context

This part belongs to the Si5338 family of high-performance, low-jitter clock generators. The family shares common architectural features such as the MultiSynth PLL architecture and QFN-24 packaging. Specific variants differ primarily in their factory-programmed frequency tables and output configurations.

Replacement Considerations

Direct replacements must match the Si5338 family specifications. Verify that alternative parts support the same I2C interface and output driver configurations. Check for pin-to-pin compatibility if substituting within the same package type.