SI5338L-B04838-GM

Overview

The SI5338L-B04838-GM is a programmable 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 on 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 is housed in a compact 4x4 mm QFN-24 package and is programmed via an I2C/SMBus interface.

Feature Summary

• MultiSynth technology enables zero ppm precision frequency synthesis on four independent outputs.
• Supports flexible input references including external crystals (8–30 MHz), CMOS, SSTL/HSTL, and differential inputs up to 710 MHz.
• Configurable output drivers support LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats with independent voltage levels.
• Features glitchless frequency adjustments in 1 ppm steps and independent phase adjustment with <20 ps accuracy.

Applications

• PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS compliant systems
• Ethernet switch/router and 1 GbE/10 GbE interfaces
• Processor and FPGA clocking
• Broadcast video/audio timing

Procurement Notes

Verify the specific ordering suffix B04838 against the manufacturer's official documentation to confirm the exact pre-programmed frequency plan and output configuration. Ensure compatibility with the required I2C address and power supply voltages for the target application design.

Selection Notes

Select this component when multiple independent clock frequencies are required from a single IC. Verify that the desired output signal formats (LVDS, LVPECL, etc.) and voltage levels match the driver capabilities. Confirm that the input reference source falls within the supported frequency ranges for optimal jitter performance.

Part Context

This part belongs to the Si5338 family of I2C-programmable quad clock generators. The 'L' designation typically indicates a specific factory-programmed configuration variant within the series, distinct from generic blank parts. It shares the same pinout and electrical characteristics as other Si5338 variants but contains unique internal synthesis parameters.

Replacement Considerations

Direct replacements must be from the Si5338 family with compatible pinouts. Verify that alternative SKUs support the same maximum output frequencies and output driver types. Check if the replacement part requires reprogramming via ClockBuilder Pro software to match the original frequency plan.

FAQ

What is the maximum input frequency supported by the Si5338?

The device supports differential inputs up to 710 MHz, while single-ended CMOS inputs are supported up to 200 MHz and SSTL/HSTL inputs up to 350 MHz.

Can the output frequencies be adjusted after programming?

Yes, the device supports independent frequency increment/decrement features that enable glitchless frequency adjustments in 1 ppm steps via the I2C interface.

What is the typical phase jitter performance?

The Si5338 offers a typical phase jitter of 0.7 ps RMS, making it suitable for high-speed serial applications like PCIe and Ethernet.