SI5338A-B04149-GMR

Overview

The SI5338A-B04149-GMR is a programmable quad clock generator utilizing MultiSynth technology. It synthesizes four independent output clocks with zero ppm frequency accuracy and supports any frequency within specified limits. The device features low phase jitter of 0.7 ps RMS typical, configurable differential and single-ended outputs (LVPECL, LVDS, CML, HCSL, CMOS, SSTL/HSTL), and operates on a single core supply of 1.8 V, 2.5 V, or 3.3 V. It accepts flexible input references including external crystals (8–30 MHz) and differential inputs up to 710 MHz. Packaged in a 4x4 mm QFN-24, it supports I2C/SMBus programming.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four output drivers with true zero ppm accuracy.
• Low phase jitter performance of 0.7 ps RMS typical across all outputs.
• Highly configurable output drivers supporting multiple formats: LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL.
• Flexible input reference options including external crystals (8–30 MHz), CMOS, SSTL/HSTL, and differential inputs up to 710 MHz.

Applications

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

Procurement Notes

Verify the specific ordering suffix B04149 against the manufacturer's current documentation to confirm factory-programmed frequency and format configurations. Confirm package type and RoHS compliance status through official Skyworks Solutions channels prior to procurement.

Selection Notes

Select this component for designs requiring four independent clock signals with precise frequency accuracy and low jitter. Ensure the required output voltage levels (1.5 V, 1.8 V, 2.5 V, or 3.3 V) match the target load requirements. Verify that the input reference source falls within the supported frequency ranges for the chosen input mode.

Part Context

This part belongs to the Si5338 family of I2C-programmable clock generators from Skyworks Solutions. The family utilizes patented MultiSynth technology to replace multiple discrete oscillators. The Si5338 series is designed for high-performance timing applications requiring flexible frequency synthesis and low power consumption in a compact footprint.

Replacement Considerations

Direct replacements within the same family include other Si5338 variants with different factory-programmed frequencies or output configurations. Verify pin compatibility and electrical specifications when substituting with other Si5338 models.

FAQ

What is the maximum input frequency supported by the Si5338?

The Si5338 supports differential input frequencies up to 710 MHz. Single-ended CMOS inputs support up to 200 MHz, while SSTL/HSTL inputs support up to 350 MHz.

Can the Si5338 generate glitchless frequency adjustments?

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

What spread spectrum capabilities are available?

The Si5338 offers highly configurable spread spectrum on any output, supporting frequencies from 5 to 350 MHz, spreads from 0.5% to 5.0%, and modulation rates from 33 to 63 kHz.