SI5335D-B04459-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5335D-B04459-GMR is a web-customizable, any-frequency, any-output quad clock generator and buffer from Skyworks Solutions. It synthesizes four non-integer-related frequencies up to 350 MHz using MultiSynth technology, ensuring 0 ppm frequency synthesis error. The device supports flexible input references including external crystals (25/27 MHz), CMOS, SSTL/HSTL, and differential inputs. Outputs are independently configurable for LVPECL, LVDS, CML, HCSL, CMOS, or SSTL/HSTL formats with selectable supply voltages of 1.5, 1.8, 2.5, or 3.3 V. It features low phase jitter of 0.7 ps RMS, two selectable PLL loop bandwidths (1.6 MHz or 475 kHz), and operates on a single core supply of 1.8, 2.5, or 3.3 V within the –40 to +85 °C temperature range.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Four independent output banks supporting any frequency (< 350 MHz) with 0 ppm synthesis error via MultiSynth fractional divider technology.
• Configurable as a clock generator or buffer with up to five user-assignable pin functions for spread spectrum control, reset, and frequency plan selection.
• Low phase jitter performance (0.7 ps RMS typical) with selectable PLL loop bandwidths of 1.6 MHz or 475 kHz for jitter attenuation.
• Flexible input options including 25/27 MHz crystals, CMOS (10–200 MHz), and differential/SSTL/HSTL inputs (10–350 MHz).

Clock Generators, PLLs, Frequency Synthesizers Applications

• PCI Express Gen 1/2/3/4 common clock and SRNS compliant systems
• Ethernet switch/router and 1 GbE/10 GbE interfaces
• DSL jitter attenuation and telecom line cards
• Processor and FPGA clocking in broadcast video/audio timing

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory configuration encoded in the B04459 suffix using the Skyworks ClockBuilder Pro utility, as this part number represents a custom frequency plan rather than a generic device. Confirm package type is 24-QFN (4x4 mm) and check RoHS compliance status. Ensure design-in documentation matches the required output formats and voltage levels specified in the datasheet electrical characteristics.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when multiple distinct clock frequencies are required from a single source with zero ppm error. Choose between 1.6 MHz and 475 kHz loop bandwidth based on whether jitter attenuation or faster lock time is prioritized. Ensure the input reference matches available system clocks (crystal vs. driven input). Verify that the required output driver voltages (1.5V, 1.8V, 2.5V, or 3.3V) align with the target receiver specifications.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5335 family of highly flexible clock generators. Unlike fixed-frequency oscillators, it allows for complete customization of output frequencies and formats through Skyworks' web-based configuration tool. The 'D' variant typically denotes specific package or thermal characteristics within the broader Si5335 portfolio, designed to replace multiple discrete clock ICs and crystal oscillators in complex digital systems.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacement requires matching the exact frequency plan and output configurations. Generic Si5335 devices cannot substitute this part without reconfiguration. Check if alternative Skyworks parts like Si5338 or Si534x offer similar flexibility if the current part is obsolete, though pinouts and capabilities may differ.