SI5338L-B-GMR

Overview

The SI5338L-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 features low phase jitter of 0.7 ps RMS typical, zero ppm frequency accuracy, and flexible input options including external crystals (8–30 MHz), CMOS, SSTL/HSTL, and differential inputs up to 710 MHz. It operates on a single core supply of 1.8, 2.5, or 3.3 V, draws 45 mA typical current, and is housed in a compact 4x4 mm QFN-24 package.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four output drivers with 0 ppm precision.
• Low phase jitter of 0.7 ps RMS typical for high-performance timing applications.
• Flexible input reference supporting external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs (5–710 MHz).
• Independently configurable outputs support LVPECL/LVDS (up to 710 MHz), HCSL, CMOS, and SSTL/HSTL formats.

Applications

• Ethernet switch/router
• PCIe Gen1/2/3/4
• Processor and FPGA clocking
• Telecom line cards
• Fibre Channel, SAN

Procurement Notes

Verify the specific 'L' suffix configuration against the official Skyworks ordering guide to ensure correct pinout and feature set. Confirm I2C address and programming requirements using ClockBuilder Pro software before integration. Check RoHS compliance status as indicated in the datasheet specifications.

Selection Notes

Select this component when requiring four independent clock outputs with varying frequencies and signal formats. Ensure the input reference matches available sources (crystal, CMOS, or differential). Verify that the required output voltage levels (1.5, 1.8, 2.5, or 3.3 V) are supported by the target loads. Consider thermal performance given the 45 mA typical core current in the small QFN package.

Part Context

The SI5338 family includes variants like SI5338A, B, C, F, M, N, and Q, differentiated by output configurations, jitter performance, and specific feature sets. The SI5338L is part of this series designed for versatile clock generation needs. All variants share the same 24-QFN package and core architecture but differ in electrical characteristics and supported output types.

Replacement Considerations

Direct replacements within the Si5338 family require matching the specific 'L' suffix configuration. Other Skyworks clock generators may offer similar functionality but often have different pinouts or feature sets. Verify compatibility with existing PCB layout and I2C addressing if substituting with other models.

FAQ

What is the maximum input frequency for the SI5338L?

The maximum input frequency is 710 MHz for differential inputs. Single-ended CMOS inputs support up to 200 MHz, while SSTL/HSTL inputs support up to 350 MHz.

Can the SI5338L generate glitchless frequency adjustments?

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

What is the typical phase jitter performance of the SI5338L?

The SI5338L typically achieves a phase jitter of 0.7 ps RMS, making it suitable for high-speed serial communication standards like PCIe and Ethernet.