SI5338B-A-GMR

Overview

The SI5338B-A-GMR is an I2C-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 a wide range of input references, including differential clocks up to 710 MHz and single-ended inputs up to 350 MHz. Outputs are configurable for LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats, each independently powered at 1.5, 1.8, 2.5, or 3.3 V. Key electrical parameters include a core supply voltage of 1.8–3.3 V, typical operating current of 45 mA, and a maximum output frequency of 710 MHz.

Feature Summary

• Four independent output drivers supporting any frequency synthesis with 0 ppm accuracy
• Low phase jitter performance of 0.7 ps RMS typical
• Flexible input options: external crystal (8-30 MHz), CMOS (5-200 MHz), SSTL/HSTL (5-350 MHz), or differential (5-710 MHz)
• Independent output voltage selection per driver: 1.5, 1.8, 2.5, or 3.3 V

Applications

• PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS compliant systems
• Ethernet switch/router and 1 GbE/10 GbE interfaces
• Processor and FPGA clocking
• Telecom line cards and MSAN/DSLAM/PON equipment

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and shipping configuration. Confirm availability status directly with authorized distributors as stock levels fluctuate. Ensure the I2C pull-up voltage matches the system requirements, noting that register adjustments may be necessary if the bus voltage is below 2.5 V.

Selection Notes

Select this component when multiple independent clock frequencies are required from a single source. Verify that the desired output signal formats (LVDS, LVPECL, etc.) align with the target receiver specifications. Check that the input reference frequency falls within the supported ranges for the chosen mode. Consider the thermal resistance characteristics if high-density PCB layouts are used.

Part Context

This part belongs to the Si5338 family of programmable clock generators. The 'B' in the model number typically denotes a specific output format configuration variant within the series, while 'A' indicates the temperature grade and revision. The '-GMR' suffix specifies the tape and reel packaging format for surface-mount assembly.

Replacement Considerations

Direct pin-to-pin replacements within the same family include other Si5338 variants such as SI5338A or SI5338F, provided the output frequency and format requirements match. Verify that the replacement part supports the specific output voltage levels and jitter performance needed for the application.