SI5338C-B11788-GMR

Overview

The SI5338C-B11788-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 external crystals (8–30 MHz), CMOS, SSTL/HSTL, and differential inputs up to 710 MHz. Outputs are configurable for LVPECL, LVDS, HCSL, CMOS, SSTL, or HSTL formats with independent supply voltages of 1.5, 1.8, 2.5, or 3.3 V. Key electrical parameters include a core supply voltage range of 1.71–3.63 V, typical operating current of 45 mA, and low phase jitter of 0.7 ps RMS. It operates within an ambient temperature range of –40 to +85 °C in a 24-lead QFN package.

Feature Summary

• MultiSynth™ technology enables independent, any-frequency synthesis on four differential output drivers with true zero ppm accuracy.
• Flexible input reference options support external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs (5–710 MHz).
• Highly configurable output drivers support LVPECL, LVDS, HCSL, CMOS, SSTL, and HSTL formats with independent output voltage settings (1.5, 1.8, 2.5, or 3.3 V).
• Low phase jitter performance of 0.7 ps RMS typ, compliant with PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS standards.

Applications

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

Procurement Notes

Verify the specific ordering suffix B11788 against the manufacturer's official documentation to confirm the programmed frequency plan and output configuration. Ensure I2C/SMBus interface compatibility with the host controller. Confirm that the 24-QFN thermal requirements and PCB land pattern match the design specifications. Check for moisture sensitivity level (MSL) handling requirements during assembly.

Selection Notes

Select this component when replacing multiple crystal oscillators with a single programmable source is required. Ensure the input reference frequency falls within the supported ranges for the chosen format. Verify that the required output frequencies do not exceed the limits for specific signal formats (e.g., 710 MHz max for LVPECL/LVDS vs. 200 MHz for CMOS). Consider the power consumption implications of the selected output driver types and load conditions.

Part Context

The SI5338C-B11788-GMR belongs to the Si5338 family of I2C-programmable clock generators. This series is designed for high-performance timing applications requiring low jitter and flexible frequency synthesis. The 'GMR' suffix indicates a tape-and-reel packaging format suitable for automated surface-mount assembly. The 'B' typically denotes a specific revision or variant within the product line.

Replacement Considerations

Direct pin-to-pin replacements within the Si5338 family may exist but require verification of the specific frequency plan encoded in the part number suffix. Generic clock generators lack the MultiSynth flexibility and must be evaluated for jitter performance and output format compatibility. Consult the manufacturer's cross-reference tools for confirmed substitutes.