SI5338N-B-GMR

Overview

The SI5338N-B-GMR is a programmable quad clock generator from Skyworks Solutions, utilizing MultiSynth technology to synthesize any frequency on four independent output drivers. It supports differential and single-ended outputs with frequencies up to 710 MHz. The device 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. It accepts flexible input references including external crystals (8–30 MHz), CMOS (up to 200 MHz), SSTL/HSTL (up to 350 MHz), and differential inputs (up to 710 MHz). Configuration is performed via an I²C/SMBus interface.

Feature Summary

• MultiSynth™ Technology: Generates four independent clocks with 0 ppm precision using patented synthesis architecture.
• Flexible Input/Output: Supports differential inputs up to 710 MHz and outputs in LVPECL, LVDS, HCSL, CMOS, SSTL, HSTL, and CML formats.
• Low Jitter Performance: Achieves 0.7 ps RMS typical random jitter for high-speed applications like PCIe Gen 4.
• Glitchless Frequency Adjustment: Independent increment/decrement feature allows frequency changes in 1 ppm steps without glitches.

Applications

• PCIe Gen 1/2/3/4 Common Clock and SRNS
• Ethernet Switch/Router and 1 GbE/10 GbE
• Processor and FPGA Clocking
• Broadcast Video/Audio Timing
• Telecom Line Cards and MSAN/DSLAM/PON

Procurement Notes

Verify the specific ordering suffix 'N' against the manufacturer's official documentation to confirm the exact factory configuration or pre-programmed parameters. Confirm package type is 24-QFN (4x4 mm) and check RoHS compliance status. Ensure I2C pull-up voltage requirements match the system design, particularly if operating below 2.5 V.

Selection Notes

Select this component when replacing multiple discrete oscillators with a single programmable source. Ensure the required output signal format (LVPECL, LVDS, etc.) and voltage levels are supported by the configurable output drivers. Verify that the input reference frequency falls within the specified ranges for crystal, CMOS, or differential inputs.

Part Context

The SI5338 series is designed as a high-performance replacement for fixed-frequency crystal oscillators. It consolidates timing functions into a single 4x4 mm QFN package, reducing board space and power consumption compared to multi-oscillator solutions. The device integrates NVM for storing configurations, enabling standalone operation after programming.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided datasheet.

FAQ

What is the maximum input frequency supported by the SI5338?

The device supports differential inputs up to 710 MHz, CMOS inputs up to 200 MHz, and SSTL/HSTL inputs up to 350 MHz.

Can the SI5338 perform glitchless frequency adjustments?

Yes, it features an independent frequency increment/decrement capability that enables glitchless frequency adjustments in 1 ppm steps.

What output formats are supported?

The Si5338 supports LVPECL, LVDS, HCSL, CMOS, SSTL, HSTL, and CML output formats, with independent voltage selection per driver.