SI5338B-B04872-GMR

Overview

The SI5338B-B04872-GMR is a programmable quad clock generator utilizing MultiSynth technology. It synthesizes four independent clocks with zero ppm precision via an I2C interface. The device supports input frequencies up to 710 MHz and output frequencies up to 710 MHz for differential formats (LVPECL, LVDS, CML) or 350 MHz for single-ended formats (SSTL, HSTL). It operates on a single core supply of 1.8 V, 2.5 V, or 3.3 V, consuming typically 45 mA. Key electrical parameters include a typical phase jitter of 0.7 ps RMS and a maximum duty cycle distortion of 60%. The component is housed in a 24-lead QFN package.

Feature Summary

• MultiSynth technology enables any-frequency synthesis with 0 ppm accuracy on four independent outputs.
• Supports flexible input references including external crystals (8–30 MHz), CMOS (5–200 MHz), and differential inputs (up to 710 MHz).
• Features low phase jitter of 0.7 ps RMS typ and glitchless frequency/phase adjustments.
• Configurable output drivers support LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats.

Applications

• PCIe Gen 1/2/3/4 common clock and SRNS compliant timing
• Ethernet switch/router clocking
• Processor and FPGA clock generation
• Broadcast video/audio timing

Procurement Notes

Verify the specific B04872 suffix configuration against the official Skyworks datasheet ordering table to confirm pinout and output format assignments. Ensure the I2C pull-up voltage compatibility matches the system bus requirements, particularly if operating below 2.5 V. Confirm moisture sensitivity handling procedures are followed during assembly.

Selection Notes

Select this model when independent, glitch-free frequency synthesis is required for multiple domains. Verify that the target output signal formats (LVPECL, LVDS, etc.) align with the specific B04872 factory configuration. Ensure the input reference source meets the slew rate requirements (>0.3 V/ns for differential) to maintain optimal jitter performance.

Part Context

This component belongs to the Si5338 family of I2C-programmable clock generators from Skyworks Solutions. The family utilizes patented MultiSynth architecture to replace multiple discrete oscillators. The 'GMR' suffix indicates a tape-and-reel packaging format suitable for automated surface-mount assembly.

FAQ

What is the maximum input frequency supported by the SI5338?

The device supports differential input frequencies up to 710 MHz, while single-ended CMOS inputs are limited to 200 MHz.

Can the output frequencies be adjusted without glitches?

Yes, the device features an independent frequency increment/decrement capability that allows glitchless frequency adjustments in 1 ppm steps.

What is the typical power consumption of the core supply?

The typical core supply current is 45 mA when all outputs are active at 100 MHz with a 25 MHz reference clock.