SI5338C-B04268-GM

Overview

The SI5338C-B04268-GM 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 supports differential and single-ended outputs including LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL. The device operates on a single core supply of 1.8 V, 2.5 V, or 3.3 V, with individual output supplies configurable from 1.5 V to 3.3 V. Key electrical parameters include a maximum input frequency of 710 MHz, typical phase jitter of 0.7 ps RMS, and an operating temperature range of –40 °C to +85 °C.

Feature Summary

• MultiSynth™ technology enables independent, any-frequency synthesis on four output drivers with true zero ppm accuracy.
• Flexible input reference options: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), or differential (5–710 MHz).
• Configurable spread spectrum (SSC) on any output with frequencies from 5 to 350 MHz and modulation rates from 33 to 63 kHz.
• Independent glitchless frequency adjustments in 1 ppm steps and phase adjustment with <20 ps resolution.

Applications

• PCIe Gen 1/2/3/4 common clock and Gen 3 SRNS compliant systems.
• Ethernet switch/router and 1 GbE/10 GbE interfaces.
• Processor and FPGA clocking solutions.
• Broadcast video/audio timing infrastructure.

Procurement Notes

Verify the specific factory configuration code embedded in the part number suffix against the official ordering guide to ensure correct output formats and frequencies. Confirm that the I2C pull-up voltage requirements align with the system bus voltage, particularly if operating below 2.5 V. Ensure ESD handling procedures are followed due to the sensitivity of the CMOS inputs and output drivers.

Selection Notes

Select this component when multiple distinct clock frequencies are required from a single package. Verify that the desired output signal formats (LVPECL, LVDS, HCSL, etc.) match the available driver configurations. Check that the input reference source falls within the supported frequency ranges for the chosen input type. Consider the thermal resistance of the 24-QFN package for heat dissipation in dense PCB layouts.

Part Context

This device belongs to the Si5338 family of I2C-programmable clock generators. It replaces discrete crystal oscillators and frequency translators. The 'C' in the part number typically denotes a specific factory configuration or output format set, while 'GMR' indicates tape-and-reel packaging. It is designed to reduce board space and power consumption compared to using multiple fixed-frequency oscillators.

Replacement Considerations

Direct pin-to-pin replacements within the same family may exist but require verification of the internal configuration data. Generic clock generators lack the MultiSynth flexibility and independent output configurability. Ensure any substitute supports the required jitter specifications and output voltage levels for the target application.