SI5335B-B05943-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5335B-B05943-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 200 MHz using MultiSynth fractional divider technology, ensuring 0 ppm frequency synthesis error. The device features four output banks supporting differential pairs or single-ended outputs with configurable formats including LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL. It operates on a single core supply of 1.8 V, 2.5 V, or 3.3 V and supports three independent pin-selectable configurations. Packaged in a 24-QFN (4x4 mm) enclosure, it functions within an ambient temperature range of –40 °C to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Four-output clock generator with 0 ppm frequency synthesis error via MultiSynth technology
• Configurable output drivers supporting LVPECL, LVDS, CML, HCSL, CMOS, SSTL, and HSTL formats
• Three independent, user-assignable, pin-selectable device configurations
• Low phase jitter performance with selectable PLL loop bandwidths of 1.6 MHz or 475 kHz

Clock Generators, PLLs, Frequency Synthesizers Applications

• PCI Express Gen 1/2/3/4 common clock generation
• Ethernet switch and router timing
• Processor and FPGA clocking
• DSL jitter attenuation
• Broadcast video/audio timing

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific factory configuration encoded in the B05943 suffix against the system requirements before procurement. Confirm that the QFN-24 package land pattern matches the recommended PCB layout provided in the datasheet. Ensure the design accounts for the moisture sensitivity level indicated on the product label. Validate power supply decoupling strategies to maintain the specified PSRR and jitter performance under operating conditions.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this component when four distinct clock frequencies are required from a single reference source with zero ppm error. Choose the SI5335B variant specifically if the maximum output frequency requirement does not exceed 200 MHz, as higher speed variants exist within the Si5335 family. Consider the available pin-selectable control functions for system flexibility. Verify that the input reference signal type (crystal, CMOS, or differential) aligns with the available input pins XA/CLKIN and XB/CLKINB.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This part belongs to the Si5335 family of highly flexible clock generators. The 'B' in the model number typically denotes the speed grade limiting output frequencies to 200 MHz, distinguishing it from 'C' or 'D' variants that support higher frequencies up to 350 MHz. The '-GMR' suffix indicates RoHS compliance and tape-and-reel packaging. The device replaces multiple discrete clock oscillators and buffers, simplifying board space and power consumption.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Direct pin-to-pin replacements within the same package require matching the specific frequency plan and output voltage levels. Higher-speed variants like the SI5335C or SI5335D may function electrically but require verification of the frequency constraints. Ensure that any substitute maintains the same 24-QFN footprint and thermal characteristics.