SI5338A-B04974-GM

Overview

The SI5338A-B04974-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 0 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, compliant with PCIe Gen 1/2/3/4 Common Clock standards.
• 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 configuration per driver supporting 1.5, 1.8, 2.5, or 3.3 V for various signal formats like LVPECL, LVDS, HCSL, and CMOS.

Applications

• Ethernet switch/router clocking
• PCIe Gen1/2/3/4 timing
• Processor and FPGA clocking
• Broadcast video/audio timing
• Telecom line cards

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm pinout compatibility and factory programming settings. Ensure the I2C pull-up voltage aligns with the system bus requirements, as register adjustments may be necessary for voltages below 2.5 V. Confirm moisture sensitivity handling procedures are followed during assembly.

Selection Notes

Select this component when low jitter (<1 ps RMS) and high flexibility in output frequencies are required. It is suitable for replacing multiple discrete oscillators. Consider the available output formats (LVPECL, LVDS, HCSL, CMOS) and ensure the desired frequency ranges fall within the specified limits for each format. Verify that the I2C interface is compatible with the host controller.

Part Context

This part belongs to the Si5338 family of programmable clock generators. The 'A' typically denotes the frequency grade or variant, while 'B' indicates the package type or revision. The 'GM' suffix specifies the tape and reel packaging format. Other variants in the series may differ in maximum output frequency or specific jitter performance characteristics.

Replacement Considerations

Direct replacements within the same family include other Si5338 variants such as SI5338A-B-GM or SI5338Q-B-GM, provided the frequency and jitter specifications meet the design requirements. Verify pin-to-pin compatibility and software configuration compatibility via ClockBuilder Pro before substitution.

FAQ

What is the maximum input frequency supported by the SI5338A-B04974-GM?

The device supports a maximum differential input frequency of 710 MHz. Single-ended CMOS inputs support up to 200 MHz, while SSTL/HSTL inputs support up to 350 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, allowing for mixed signal format outputs.

Is the device compliant with PCIe standards?

Yes, the Si5338 is compliant with PCIe Gen 1/2/3/4 Common Clock and Gen 3 SRNS (Separate Reference No Spread) standards.