SI5335C-B05977-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The Skyworks SI5335C-B05977-GMR is a web-customizable, any-frequency, any-output quad clock generator and buffer. 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 within a temperature range of –40 to +85 °C in a 4x4 mm 24-QFN package.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Four independent output banks supporting any frequency up to 350 MHz with 0 ppm synthesis error
• Configurable as clock generator or buffer with three pin-selectable device configurations
• Flexible input support: External crystal, CMOS, SSTL/HSTL, and differential signals
• Low phase jitter of 0.7 ps RMS and selectable PLL loop bandwidths (1.6 MHz or 475 kHz)

Clock Generators, PLLs, Frequency Synthesizers Applications

• PCI Express Gen 1/2/3/4 common clock and jitter attenuation
• Ethernet switch/router and 1 GbE/10 GbE interfaces
• Processor and FPGA clocking
• DSL jitter attenuation and telecom line cards

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory configuration encoded in the B05977 suffix via the official datasheet or ClockBuilder Pro tool, as this determines the exact output frequencies and control pin assignments. Confirm availability status directly with Skyworks Solutions or authorized distributors, as custom parts may have limited stock or specific lead times.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when multiple distinct clock frequencies are required from a single device with strict jitter specifications. Ensure the input reference type matches the system design (crystal vs. external clock). Verify that the required output voltage levels (1.5V, 1.8V, 2.5V, or 3.3V) are compatible with the load devices. Use the ClockBuilder Pro utility to generate the correct configuration file for the B05977 variant.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The SI5335C-B05977-GMR belongs to the Si5335 family of highly flexible clock generators. The 'C' indicates a specific performance or feature tier within the series, while 'B05977' denotes a unique factory-programmed configuration. The '-GMR' suffix typically signifies a tape-and-reel packaging option for surface-mount assembly, differing from tray-packaged variants like the -GM suffix.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct replacements require identical frequency plans and pin configurations. Generic Si5335 variants (e.g., SI5335A or SI5335D) differ in maximum output frequency limits (<350 MHz vs <200 MHz) and input types. Substitution must be validated using the ClockBuilder Pro tool to ensure electrical compatibility and functional equivalence.