SI5338Q-B-GMR

Application Specific Clock/Timing Overview

The SI5338Q-B-GMR is a programmable quad clock generator utilizing MultiSynth technology to synthesize any frequency with zero ppm precision on four independent output drivers. It operates from a single core supply of 1.8, 2.5, or 3.3 V and supports flexible input references including external crystals (8–30 MHz), CMOS (up to 200 MHz), SSTL/HSTL (up to 350 MHz), and differential inputs (up to 710 MHz). The device features low phase jitter of 0.7 ps RMS typical, glitchless frequency adjustments in 1 ppm steps, and independent phase adjustment with <20 ps resolution. Outputs support LVPECL, LVDS, HCSL, CMOS, SSTL, HSTL, and CML formats.

Application Specific Clock/Timing Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four output drivers with true zero ppm accuracy.
• Low phase jitter performance of 0.7 ps RMS typical for GbE and OC-12 applications.
• Flexible input reference options: external crystal (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential (5–710 MHz).
• Independent output voltage per driver (1.5, 1.8, 2.5, or 3.3 V) and configurable spread spectrum on any output.

Application Specific Clock/Timing Applications

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

Application Specific Clock/Timing Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type, tape-and-reel specifications, and environmental compliance status. Ensure the I2C pull-up voltage matches the system bus requirements, as register configuration may be necessary for voltages below 2.5 V.

Application Specific Clock/Timing Selection Notes

Select this component when zero ppm frequency accuracy and low jitter are required across multiple independent outputs. Confirm that the desired output signal formats (LVPECL, LVDS, HCSL, etc.) and frequencies fall within the supported ranges. Verify that the available input reference source matches one of the supported types and frequency limits.

Application Specific Clock/Timing Part Context

The SI5338Q-B-GMR belongs to the Si5338 family of I2C-programmable clock generators. It replaces discrete oscillators by synthesizing frequencies internally. The 'Q' suffix typically denotes automotive qualification, while 'GMR' indicates the reel packaging format. It shares the same functional block diagram and pinout with other Si5338 variants.

Application Specific Clock/Timing Replacement Considerations

Direct replacements must match the 24-QFN package and I2C interface. Verify that alternative part numbers support the same output formats and frequency ranges. Check if the substitute maintains the required jitter specifications and operating temperature range (-40 to +85 °C).

Application Specific Clock/Timing FAQ

What is the maximum input frequency for differential inputs?

The maximum input frequency for differential inputs on pins IN1/2 and IN5/6 is 710 MHz.

Can the device perform glitchless frequency adjustments?

Yes, the device supports independent frequency increment/decrement features that enable glitchless frequency adjustments in 1 ppm steps.

What is the typical phase jitter specification?

The typical phase jitter is 0.7 ps RMS, measured under standard test conditions for GbE and OC-12 applications.