SI5338J-A-GM

Overview

The SI5338J-A-GM 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 formats including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL. The device operates with a core supply of 1.8 V, 2.5 V, or 3.3 V and features low phase jitter of 0.7 ps RMS typical. Input references range from external crystals (8–30 MHz) to differential inputs up to 710 MHz. Configuration is managed via an I²C/SMBus interface.

Feature Summary

• MultiSynth™ technology enables zero ppm precision frequency synthesis on four independent outputs.
• Supports flexible input sources: external crystal, CMOS, SSTL/HSTL, and differential signals up to 710 MHz.
• Configurable output drivers support various signal formats and independent supply voltages (1.5, 1.8, 2.5, or 3.3 V).
• 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 timing.
• Processor and FPGA clocking.
• Broadcast video/audio timing.
• Telecom line cards and MSAN/DSLAM/PON applications.

Procurement Notes

Verify the specific ordering suffix 'J' against the manufacturer's current documentation to confirm pinout, package type, and factory programming details. Ensure compatibility with I²C bus voltage levels if operating below 2.5 V by checking register settings for standard compliance.

Selection Notes

Select this component when designing systems requiring independent frequency synthesis across multiple domains without external oscillators. Consider the output format requirements (LVDS vs CMOS) and supply voltage constraints for each driver. Verify that the input reference frequency falls within the supported ranges for the desired output configuration.

Part Context

The SI5338 series replaces multiple discrete crystal oscillators with a single integrated solution. The 'A' designation typically indicates a specific package variant, while 'GM' denotes the QFN-24 package. This model belongs to the Si533x family designed for high-performance clock generation in data communication and computing infrastructure.

Replacement Considerations

Direct replacements within the Si5338 family may require reprogramming via ClockBuilder Pro software. Verify that alternative part numbers match the required output frequencies, jitter specifications, and package dimensions before substitution.

FAQ

What is the maximum input frequency for differential clocks?

The maximum input frequency for differential clocks on pins IN1/2 and IN5/6 is 710 MHz.

Can the output supply voltages be different for each driver?

Yes, each output driver can be independently configured to operate at 1.5 V, 1.8 V, 2.5 V, or 3.3 V.

How is the device programmed?

The device is programmed via an I²C/SMBus-compatible serial interface using Skyworks' ClockBuilder Pro software.