SI5338F-B-GM

Overview

The SI5338F-B-GM is a programmable quad clock generator utilizing MultiSynth technology to synthesize any frequency on four independent output drivers. It supports core supply voltages of 1.8 V, 2.5 V, or 3.3 V and operates within an ambient temperature range of –40 °C to +85 °C. The device features a maximum input frequency of 710 MHz and output frequencies up to 710 MHz for differential formats (LVPECL/LVDS) or 200 MHz for CMOS. Typical phase jitter is 0.7 ps RMS, with a typical core supply current of 45 mA. It is housed in a 24-lead QFN package measuring 4 x 4 mm.

Feature Summary

• MultiSynth technology enables zero ppm precision synthesis on four independent outputs.
• Flexible input references including external crystals (8–30 MHz), CMOS (5–200 MHz), and differential inputs (up to 710 MHz).
• Configurable output drivers supporting LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL formats with independent voltage levels.
• Glitchless frequency adjustment via independent increment/decrement features and programmable spread spectrum.

Applications

• PCIe Gen 1/2/3/4 common clock and SRNS compliant systems.
• Ethernet switch/router timing.
• Processor and FPGA clocking.
• Broadcast video/audio timing.
• Telecom line cards and MSAN/DSLAM/PON equipment.

Procurement Notes

Verify the specific suffix 'F' against the manufacturer's ordering guide to confirm the factory-programmed configuration file, as this determines the default output frequencies and formats. Ensure I2C pull-up voltages are compatible with the selected core supply voltage by checking register settings if operating below 2.5 V.

Selection Notes

Select this component when replacing multiple discrete oscillators with a single low-jitter programmable source. Confirm that the required output signal formats (LVPECL, LVDS, etc.) and frequencies fall within the specified limits for the chosen driver supplies. Validate thermal performance using the provided junction-to-ambient resistance values for the target PCB layout.

Part Context

This part belongs to the Si5338 family of I2C-programmable clock generators from Skyworks Solutions. The family shares the same pinout and core architecture but differs in pre-programmed configurations and potentially output drive strengths or jitter performance profiles defined by the alphanumeric suffixes.

Replacement Considerations

Direct pin-compatible replacements within the Si5338 family include other variants such as SI5338Q or SI5338C series parts. Verify that the substitute part's programmed configuration matches the design requirements or can be reprogrammed via I2C to achieve the necessary output specifications.

FAQ

What is the maximum input frequency supported by the SI5338F-B-GM?

The device supports a maximum differential input frequency of 710 MHz. Single-ended CMOS inputs are limited to 200 MHz.

Can the output frequencies be adjusted without glitches?

Yes, the device includes independent frequency increment/decrement features that enable glitchless frequency adjustments in 1 ppm steps.

What is the typical phase jitter performance?

The typical phase jitter is 0.7 ps RMS, measured under standard test conditions with differential outputs.