SI5338B-B05287-GM

Overview

The SI5338B-B05287-GM is a factory-programmed, I2C-controlled quad clock generator utilizing Skyworks MultiSynth technology. It synthesizes four independent output clocks with zero ppm frequency accuracy and low phase jitter of 0.7 ps RMS typical. The device supports flexible input references including differential (up to 710 MHz), single-ended CMOS (up to 200 MHz), and external crystals (8–30 MHz). Outputs are configurable for LVPECL, LVDS, CML, HCSL, CMOS, SSTL, or HSTL formats, operating on a single core supply of 1.8 V, 2.5 V, or 3.3 V within a 4x4 mm QFN-24 package.

Feature Summary

• MultiSynth™ Technology: Enables independent, any-frequency synthesis on four differential output drivers with true zero ppm precision.
• Low Phase Jitter: Achieves 0.7 ps RMS typical jitter performance compliant with PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS standards.
• Flexible Input References: Supports differential inputs up to 710 MHz, single-ended CMOS up to 200 MHz, and external crystals from 8 to 30 MHz.
• Configurable Outputs: Each driver supports independent voltage levels (1.5, 1.8, 2.5, or 3.3 V) and signal formats including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL.

Applications

• PCIe Gen 1/2/3/4 systems
• Ethernet switch/router timing
• Processor and FPGA clocking
• Broadcast video/audio timing
• Telecom line cards

Procurement Notes

Verify the specific factory-programmed configuration parameters against the datasheet's ordering information section. Confirm that the required output frequencies and signal formats match the pre-defined settings for this part number, as custom programming cannot be performed post-manufacture.

Selection Notes

Select this component when fixed, glitch-free frequency generation is required without field reprogramming. Ensure the input reference source matches the supported ranges (differential, single-ended, or crystal). Verify that the target application requires the specific output combinations provided in the factory configuration.

Part Context

This part belongs to the Si5338 family of I2C-programmable clock generators. Unlike user-programmable variants, the 'B' suffix indicates a factory-customized version where frequencies and configurations are permanently set during manufacturing using NVM, ensuring consistent performance across production batches.

Replacement Considerations

Direct replacement requires matching the exact factory-programmed output frequencies and formats. If field programmability is needed, consider standard Si5338 variants instead. Verify pinout compatibility and thermal characteristics remain identical to the existing design.

FAQ

Can the output frequencies of the SI5338B-B05287-GM be changed after purchase?

No, this is a factory-programmed part. The frequencies and configurations are permanently stored in non-volatile memory and cannot be modified via I2C after manufacturing.

What is the maximum input frequency for differential clocks?

The maximum input frequency for differential clocks on pins IN1/2 and IN5/6 is 710 MHz.

Does the device support spread spectrum clocking (SSC)?

Yes, the Si5338 supports highly configurable spread spectrum on any output, with frequency deviation from 0.5% to 5.0% and modulation rates from 33 to 63 kHz.