SI5338G-B04256-GMR

Overview

The SI5338G-B04256-GMR 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 outputs with formats including LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL. The device operates on a 1.8 V, 2.5 V, or 3.3 V core supply and accepts flexible inputs such as external crystals (8–30 MHz), CMOS (up to 200 MHz), or differential signals (up to 710 MHz). Key electrical parameters include a typical phase jitter of 0.7 ps RMS, a maximum output frequency of 710 MHz for differential pairs, and operation within a temperature range of –40 °C to +85 °C.

Feature Summary

• MultiSynth™ Technology: Enables independent, any-frequency synthesis with true zero ppm accuracy on four output drivers.
• Flexible Output Configurations: Supports up to four differential outputs, eight single-ended outputs, or mixed combinations with independent voltage levels (1.5, 1.8, 2.5, or 3.3 V).
• Low Phase Jitter: Achieves typical RMS jitter of 0.7 ps, compliant with PCIe Gen 1/2/3/4 Common Clock and SRNS standards.
• Glitchless Frequency Adjustment: Features independent frequency increment/decrement capabilities in 1 ppm steps and phase adjustment with <20 ps accuracy.

Applications

• PCIe Gen 1/2/3/4 systems requiring common clock or separate reference no spread (SRNS) compliance.
• Ethernet switch/router and telecom line card timing.
• Processor and FPGA clocking solutions.
• Broadcast video/audio timing and MSAN/DSLAM/PON infrastructure.

Procurement Notes

Verify the specific factory configuration code B04256 against the official Skyworks ordering guide to ensure correct pre-programmed frequencies and pin assignments. Confirm that the GMR suffix indicates tape-and-reel packaging suitable for automated surface-mount assembly. Cross-reference the datasheet revision date to validate operating conditions and electrical specifications.

Selection Notes

Select this component when designing systems requiring multiple independent clock frequencies from a single package. Ensure input source compatibility with supported ranges (crystal, CMOS, or differential). Verify that the required output signal formats (LVPECL, LVDS, etc.) align with the load requirements and that the 4x4 mm QFN-24 package fits the PCB land pattern constraints.

Part Context

This part belongs to the Si5338 family of I2C-programmable clock generators. The 'G' suffix typically denotes a specific commercial grade or package variant within the Skyworks portfolio, while 'B04256' represents a unique factory programming code defining the internal register map. The 'GMR' suffix specifies the reel packaging format.

Replacement Considerations

Direct replacements must be selected from the Si5338 family (e.g., SI5338A, SI5338N, SI5338Q) with matching factory codes. Verify that substitute parts support the same output frequencies, jitter performance, and I2C programming interface without requiring hardware redesign.