SI5338C-B04068-GMR

Overview

The SI5338C-B04068-GMR is a programmable quad clock generator from Skyworks Solutions. It utilizes MultiSynth technology to synthesize any frequency on four independent output drivers with zero ppm precision. The device supports flexible input references, including differential inputs up to 710 MHz and single-ended CMOS inputs up to 200 MHz. Outputs are configurable for various signal formats such as LVDS, LVPECL, HCSL, and CMOS, with independent voltage levels of 1.5, 1.8, 2.5, or 3.3 V. It operates from a single core supply of 1.8, 2.5, or 3.3 V, features low phase jitter of 0.7 ps RMS typical, and is housed in a 24-lead QFN package.

Feature Summary

• Four independent output drivers capable of synthesizing any frequency with 0 ppm accuracy using MultiSynth technology.
• Flexible input support for external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential signals (5–710 MHz).
• Configurable output formats including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL with independent driver voltages.
• Glitchless frequency adjustment via independent increment/decrement pins and programmable spread spectrum generation.

Applications

• PCIe Gen 1/2/3/4 common clock and SRNS compliant timing.
• Ethernet switch and router clocking.
• Processor and FPGA clock distribution.
• Broadcast video and audio timing systems.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm pinout compatibility and factory configuration. Ensure I2C pull-up voltages align with the system bus requirements, noting that register adjustments may be necessary if the bus voltage is below 2.5 V. Confirm thermal management strategies for the QFN-24 package under maximum load conditions.

Selection Notes

Select this component when multiple independent clock frequencies are required from a single source with high precision. Ensure the target output format and voltage levels match the receiver specifications. Verify that the input reference frequency falls within the supported ranges for the desired synthesis mode. Consider the power consumption profile, which varies significantly based on output load and frequency.

Part Context

This part belongs to the Si5338 family of I2C-programmable clock generators. It is designed to replace multiple discrete crystal oscillators in complex digital systems. The device integrates a PLL and multiple MultiSynth dividers to provide flexible clock generation capabilities in a compact form factor suitable for space-constrained designs.

Replacement Considerations

Direct replacements within the same family include other Si5338 variants with different pre-configured frequencies or output types. When substituting, verify that the new part supports the required input frequencies and output formats. Check for any differences in the I2C addressing or register map if the replacement has a different suffix indicating software configuration changes.