SI5338A-B08985-GMR

Overview

The SI5338A-B08985-GMR is an I2C-programmable quad clock generator utilizing MultiSynth technology. It synthesizes any frequency on four independent output drivers with zero ppm precision. The device supports a core supply of 1.8, 2.5, or 3.3 V and operates within a temperature range of –40 to +85 °C. Key electrical parameters include a maximum input frequency of 710 MHz, typical phase jitter of 0.7 ps RMS, and a typical core supply current of 45 mA. It is housed in a 4 x 4 mm QFN-24 package.

Feature Summary

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

Applications

• PCIe Gen 1/2/3/4 systems
• Ethernet switch/router timing
• Processor and FPGA clocking
• Broadcast video/audio timing
• Telecom line cards

Procurement Notes

Verify the specific ordering suffix B08985 against the manufacturer's official documentation to confirm factory programming details. Ensure compatibility with I2C/SMBus interface requirements and check for moisture sensitivity handling procedures during assembly. Confirm that the QFN-24 package land pattern matches the recommended PCB layout specifications provided in the datasheet.

Selection Notes

Select this component when designing systems requiring four independent clock signals with precise frequency synthesis and low jitter. Ensure the application supports the required input reference frequencies and output voltage levels. Consider the thermal characteristics and power consumption (typical 45 mA) when designing the power delivery network and thermal management strategy for the 4x4mm QFN package.

Part Context

This part belongs to the Si5338 family of high-performance, low-jitter clock generators from Skyworks Solutions. The family utilizes patented MultiSynth technology to replace multiple crystal oscillators. The SI5338A variant specifically supports frequencies up to 710 MHz, distinguishing it from lower-frequency variants within the same product line.

Replacement Considerations

Direct replacements within the Si5338 family must match the output count and frequency capabilities. Verify that alternative SKUs support the same I2C programmability and output format configurations. Cross-reference pinouts and package dimensions to ensure mechanical compatibility without redesigning the PCB footprint.