SI5338C-B-GMR

Overview

The SI5338C-B-GMR is a programmable quad clock generator utilizing MultiSynth technology. It synthesizes four independent clocks with zero ppm accuracy via an I2C interface. The device supports flexible input references, including external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs (5–710 MHz). Outputs support LVPECL/LVDS up to 710 MHz, HCSL up to 250 MHz, CMOS up to 200 MHz, and SSTL/HSTL up to 350 MHz. Key electrical parameters include a core supply voltage of 1.8 V, 2.5 V, or 3.3 V, typical operating current of 45 mA, and a typical phase jitter of 0.7 ps RMS.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four output drivers with true zero ppm frequency accuracy.
• 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.
• Highly configurable output drivers supporting LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats with independent voltage selection (1.5, 1.8, 2.5, or 3.3 V).
• Supports glitchless frequency adjustments in 1 ppm steps and independent phase adjustment with <20 ps accuracy.

Applications

• Ethernet switch/router timing
• PCIe Gen1/2/3/4 clocking
• Broadcast video/audio timing
• Processor and FPGA clocking
• MSAN/DSLAM/PON systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type, tape-and-reel specifications, and temperature range. Ensure compatibility with the I2C bus voltage levels (1.71 V to 3.63 V) required for the target system design.

Selection Notes

Select this component when designing systems requiring low-jitter, multi-standard clock generation from a single IC. Consider the available input reference types and required output signal formats (LVDS vs. CMOS) to ensure the configuration meets the load requirements. Verify that the desired output frequencies fall within the supported ranges for the selected driver format.

Part Context

The SI5338C-B-GMR belongs to the Si5338 family of I2C-programmable clock generators. This series is designed to replace multiple discrete crystal oscillators, reducing board space and power consumption while providing high-precision clock signals for high-speed digital interfaces.

Replacement Considerations

Consult the manufacturer's datasheet for direct pin-compatible alternatives within the Si5338 family. Verify that any substitute part maintains the same output drive capabilities, jitter performance, and programming interface compatibility.

FAQ

What is the maximum input frequency supported by the SI5338C-B-GMR?

The device supports differential inputs up to 710 MHz, SSTL/HSTL inputs up to 350 MHz, and CMOS inputs up to 200 MHz.

Can the SI5338C-B-GMR generate glitch-free frequency changes?

Yes, it features an independent frequency increment/decrement capability that allows glitchless frequency adjustments in 1 ppm steps.

What is the typical phase jitter specification for this device?

The typical phase jitter is 0.7 ps RMS, measured under standard test conditions with differential outputs.