SI5338B-B-GM

Overview

The SI5338B-B-GM is a programmable quad clock generator utilizing MultiSynth technology to synthesize any frequency on four independent output drivers. It supports differential and single-ended formats including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL. The device accepts inputs from external crystals (8–30 MHz), CMOS (5–200 MHz), or differential clocks up to 710 MHz. Key electrical parameters include a core supply voltage of 1.8 V, 2.5 V, or 3.3 V, a typical operating current of 45 mA, and a maximum output frequency of 710 MHz. It features low phase jitter of 0.7 ps RMS typ and operates within a temperature range of –40 °C to +85 °C.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis with zero ppm precision on four outputs.
• Supports flexible input references: external crystal, CMOS, SSTL/HSTL, and differential inputs up to 710 MHz.
• Configurable output drivers support various signal formats and independent supply voltages (1.5, 1.8, 2.5, or 3.3 V).
• Includes independent frequency increment/decrement and phase adjustment features for glitchless adjustments.

Applications

• PCIe Gen 1/2/3/4 Common Clock and Gen 3 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 against the manufacturer's official documentation to confirm pinout compatibility and pre-programmed NVM content. Ensure the I2C pull-up voltage matches the system requirements, as register configuration may be necessary for voltages below 2.5 V. Confirm thermal management strategies for the QFN-24 package under maximum load conditions.

Selection Notes

Select this component when independent frequency synthesis across multiple outputs is required without using multiple discrete oscillators. Verify that the desired output frequencies and formats (LVPECL, LVDS, etc.) are supported by the internal VCO limits. Consider the input source type, as differential inputs allow higher frequencies up to 710 MHz compared to single-ended CMOS inputs limited to 200 MHz.

Part Context

The SI5338B-B-GM belongs to the Si5338 family of I2C-programmable clock generators. It replaces multiple fixed-frequency crystal oscillators in complex digital systems. The 'B' designation typically indicates specific factory programming or feature sets within the broader Si5338 series, which also includes variants like SI5338A and SI5338J with different frequency capabilities.

Replacement Considerations

Direct replacements within the same family include SI5338A-B-GM for higher frequency applications up to 710 MHz on all outputs, or SI5338J-B-GMR for lower frequency needs up to 200 MHz. Ensure that any substitute part maintains compatibility with the existing I2C configuration and output driver requirements.