SI5338A-B-GMR

Overview

The SI5338A-B-GMR is an I2C-programmable quad clock generator utilizing MultiSynth technology. It synthesizes any frequency up to 710 MHz with zero ppm precision on four independent outputs. The device supports LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats with independent supply voltages of 1.5, 1.8, 2.5, or 3.3 V per driver. Core supply ranges from 1.71 V to 3.63 V. Typical RMS jitter is 0.7 ps. It operates within a -40 °C to +85 °C range in a 24-lead QFN package.

Feature Summary

• MultiSynth technology enables independent, any-frequency synthesis on four differential output drivers.
• Low phase jitter of 0.7 ps RMS typical.
• Flexible input reference supporting external crystals (8–30 MHz), CMOS (5–200 MHz), and differential inputs (up to 710 MHz).
• Independent output voltage configuration 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.
• Broadcast video/audio timing.
• Telecom line cards and Fibre Channel/SAN applications.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and shipping format. Ensure the I2C pull-up voltage matches the system requirements, as register adjustments may be necessary for voltages below 2.5 V. Confirm humidity sensitivity handling during storage and assembly.

Selection Notes

Select this component when low jitter (<1 ps RMS) and high precision (0 ppm) are required across multiple independent frequencies. Verify that the target output formats (LVPECL, LVDS, etc.) and frequencies fall within the specified limits. Ensure the design accommodates the 4 x 4 mm QFN thermal characteristics and I2C interface constraints.

Part Context

This part belongs to the Si5338 family of programmable clock generators. The 'A' designation typically indicates the maximum frequency capability (710 MHz), while 'B' denotes the package variant. The '-GMR' suffix specifies the tape and reel packaging format for automated surface-mount assembly.

Replacement Considerations

Direct replacements within the same family include SI5338A-B-GM (tray packaging) or other suffixes like SI5338J-B-GMR if lower frequency requirements (200 MHz) suffice. Cross-family replacement requires verification of pin compatibility and electrical specifications.

FAQ

What is the maximum input frequency supported by the SI5338A?

The device supports a maximum differential input frequency of 710 MHz.

Can the output drivers operate at different supply voltages?

Yes, each of the four output drivers can be independently configured to operate at 1.5, 1.8, 2.5, or 3.3 V.

Is the device compliant with PCIe standards?

Yes, it is compliant with PCIe Gen 1/2/3/4 Common Clock and Gen 3 Separate Reference No Spread (SRNS) standards.