SI5338A-B04774-GM

Overview

The SI5338A-B04774-GM is a programmable quad clock generator utilizing MultiSynth technology. It synthesizes any frequency on four independent outputs with zero ppm precision. The device supports differential and single-ended formats including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL. Maximum output frequencies reach 710 MHz for differential signals and 200 MHz for CMOS. It operates from a 1.8 V, 2.5 V, or 3.3 V core supply with typical current consumption of 45 mA. Integrated phase jitter is typically 0.7 ps RMS.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four output drivers with 0 ppm accuracy.
• Supports flexible input references: external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs (5–710 MHz).
• Configurable output drivers support LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats with independent voltage levels.
• Features glitchless frequency adjustment in 1 ppm steps and independent phase adjustment with <20 ps resolution.

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
• Telecom line cards and Fibre Channel/SAN

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm pinout compatibility and factory configuration. Ensure the I2C pull-up voltage aligns with the system bus requirements, as register adjustments may be necessary for voltages below 2.5 V. Confirm package integrity upon receipt, as the component is moisture sensitive.

Selection Notes

Select this model for applications requiring high-precision clock synthesis across multiple domains. Ensure the required output format matches the supported voltage ranges (1.5 V, 1.8 V, 2.5 V, or 3.3 V). Verify that the input reference source falls within the specified frequency limits for the chosen interface type. Utilize ClockBuilder Pro software for optimal configuration and jitter performance validation.

Part Context

This component belongs to the Si5338 family of I2C-programmable clock generators. It replaces discrete crystal oscillators by providing four independent clock outputs from a single reference. The device integrates a PLL and MultiSynth synthesizers to achieve low-jitter performance in a compact 4x4 mm QFN package suitable for space-constrained designs.

Replacement Considerations

Direct replacements must maintain the same pinout and functional capabilities. Consult the manufacturer's cross-reference guide for verified substitutes. Ensure alternative components support the required output formats and frequency ranges without compromising jitter specifications.

FAQ

What is the maximum differential output frequency?

The maximum differential output frequency is 710 MHz for LVPECL, LVDS, and CML formats.

Can the device operate in buffer mode?

Yes, the Si5338 supports a clock buffer mode (PLL bypass) where the input clock is directly passed to the outputs.

How is the device programmed?

The device is programmed via an I2C/SMBus-compatible serial interface using registers accessible through SCL and SDA pins.