SI5338C-A-GM

Overview

The SI5338C-A-GM 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 flexible input references, including external crystals (8–30 MHz), CMOS (up to 200 MHz), and differential inputs (up to 710 MHz). Outputs are configurable for LVPECL, LVDS, HCSL, CMOS, SSTL, or HSTL formats, with individual supply voltages of 1.5, 1.8, 2.5, or 3.3 V per driver. It operates on a single core supply of 1.8, 2.5, or 3.3 V, features low phase jitter (0.7 ps RMS typ), and is housed in a 4x4 mm QFN-24 package.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four differential output drivers with 0 ppm accuracy.
• Flexible input support: External crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and Differential (5–710 MHz).
• Configurable outputs support LVPECL/LVDS (0.16–710 MHz), HCSL (0.16–250 MHz), CMOS (0.16–200 MHz), and SSTL/HSTL (0.16–350 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 timing.
• Ethernet switch/router and 1 GbE/10 GbE interfaces.
• Processor and FPGA clocking systems.
• Broadcast video/audio timing distribution.
• MSAN/DSLAM/PON and Fibre Channel/SAN applications.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm pinout compatibility and factory programming options. The 'A' suffix typically denotes a specific factory configuration; ensure this matches the required clock frequencies and formats for the target design. Cross-reference the RoHS status and lead-free specifications if environmental compliance is mandatory for the assembly process.

Selection Notes

Select this component when replacing multiple discrete oscillators with a single programmable source. Ensure the required output frequencies fall within the supported ranges for the chosen signal format (e.g., LVDS up to 710 MHz vs. CMOS up to 200 MHz). Verify that the system power budget accommodates the typical 45 mA core supply current plus individual output buffer loads. Confirm I2C bus voltage compatibility with the host controller.

Part Context

The SI5338C-A-GM belongs to the Si5338 family of high-performance, low-jitter clock generators. This series is designed to replace up to four different frequency crystal oscillators or operate as a frequency translator. The device integrates a Phase Frequency Detector, Loop Filter, VCO, and MultiSynth stages into a compact 24-QFN package, offering significant board space savings compared to discrete oscillator solutions.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. When evaluating alternatives, verify that the replacement supports the same MultiSynth architecture, I2C programming interface, and output voltage levels (1.5V–3.3V) to maintain circuit compatibility without hardware modifications.