SI5338A-B05808-GMR

Overview

The SI5338A-B05808-GMR is a programmable quad clock generator utilizing Skyworks MultiSynth technology. It synthesizes four independent clocks with zero ppm accuracy via an I2C interface. The device supports differential and single-ended outputs including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL. Maximum output frequencies reach 710 MHz for differential formats and 200 MHz for CMOS. Key electrical parameters include a core supply voltage of 1.8 V to 3.3 V, typical operating current of 45 mA, and RMS jitter as low as 0.7 ps. It operates within a temperature range of -40 °C to +85 °C in a 24-lead QFN package.

Feature Summary

• MultiSynth technology enables independent frequency synthesis on four output drivers with true zero ppm precision.
• Flexible input reference options support external crystals (8–30 MHz), CMOS (5–200 MHz), SSTL/HSTL (5–350 MHz), and differential inputs (5–710 MHz).
• Configurable spread spectrum generation allows frequency deviation from 0.5% to 5.0% and modulation rates from 33 to 63 kHz.
• Independent phase adjustment provides step accuracy better than 20 ps per output driver.

Applications

• PCIe Gen 1/2/3/4 common clock and SRNS compliant timing
• Ethernet switch and router clocking
• Processor and FPGA clock distribution
• Broadcast video and audio timing systems

Procurement Notes

Verify the specific factory configuration encoded in the B05808 suffix against design requirements using ClockBuilder Pro software. Confirm that the QFN-24 package land pattern matches the recommended PCB layout specifications provided in the datasheet. Ensure I2C pull-up voltages are compatible with the selected core supply voltage.

Selection Notes

Select this component when multiple independent clock frequencies are required from a single source. Verify that the target output format (LVPECL, LVDS, etc.) falls within the supported frequency ranges listed in Table 6. Check power consumption limits, particularly for high-frequency CMOS or LVPECL outputs, against the available thermal budget in the 4x4 mm QFN package.

Part Context

This part belongs to the Si5338 family of I2C-programmable any-frequency clock generators. The 'A' designation typically indicates specific performance or feature variants within the series, while the alphanumeric suffix defines the factory-programmed register settings for frequency and output configuration.

Replacement Considerations

Direct pin-to-pin replacements within the same family include other Si5338 variants with different factory configurations. Ensure the substitute part number supports the required output formats and frequencies without requiring hardware changes to the board layout.