SI5338F-B-GMR

Overview

The SI5338F-B-GMR is a quad clock generator 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 from a single core supply of 1.8, 2.5, or 3.3 V and features low phase jitter of 0.7 ps RMS typical. It accepts flexible input references including external crystals (8–30 MHz), CMOS (up to 200 MHz), SSTL/HSTL (up to 350 MHz), and differential inputs (up to 710 MHz). Configuration is performed via an I²C/SMBus interface.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four output drivers with zero ppm precision.
• Supports PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS compliance.
• Flexible input reference options: external crystal, CMOS, SSTL/HSTL, and differential signals.
• Independent output voltage per driver selectable at 1.5, 1.8, 2.5, or 3.3 V.

Applications

• Ethernet switch/router
• PCIe Gen1/2/3/4 systems
• Broadcast video/audio timing
• Processor and FPGA clocking
• MSAN/DSLAM/PON

Procurement Notes

Verify the specific suffix 'F' against the manufacturer's ordering guide to confirm the pre-programmed frequency configuration. Confirm the 'GMR' suffix indicates tape-and-reel packaging. Ensure the design accounts for the 24-QFN package thermal characteristics and moisture sensitivity levels during assembly.

Selection Notes

Select this component when four independent clock outputs with varying frequencies and signal formats are required in a compact footprint. Verify that the input reference source matches the supported ranges (crystal, CMOS, or differential). Check if the required output voltage levels (1.5V to 3.3V) align with the target load requirements.

Part Context

This part belongs to the Si5338 family of I²C-programmable clock generators. It replaces multiple discrete oscillators by providing four synthesizable outputs. The device integrates a PLL and MultiSynth dividers to achieve high-precision frequency generation within a 4x4 mm QFN package.

Replacement Considerations

Direct pin-to-pin replacements within the same family include other Si5338 variants with different pre-programmed configurations. Verify that alternative part numbers support the same output count and frequency range requirements before substitution.

FAQ

What is the maximum input frequency supported?

The device supports differential inputs up to 710 MHz, SSTL/HSTL inputs up to 350 MHz, and CMOS inputs up to 200 MHz.

Can the outputs operate at different voltages?

Yes, each output driver has an independent supply pin (VDDOx) that can be powered at 1.5, 1.8, 2.5, or 3.3 V.

Is glitchless frequency adjustment supported?

Yes, the device features independent frequency increment/decrement capabilities allowing glitchless adjustments in 1 ppm steps.