SI5348B-E-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5348B-E-GMR is a network synchronizer and jitter attenuator from Skyworks Solutions, packaged in a 64-lead 9x9 mm QFN. It integrates three independent DSPLLs capable of supporting SyncE, IEEE 1588 PTP, and SETS architectures. The device features ultra-low jitter of 95 fs (12 kHz to 20 MHz) and supports input frequencies up to 750 MHz for differential clocks and 250 MHz for LVCMOS. Output frequencies range from 1 PPS to 718.5 MHz differentially and 250 MHz for LVCMOS. It operates on core voltages of 1.8 V and 3.3 V with independent output supplies, functioning within a temperature range of –40 to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Three independent DSPLLs support flexible SyncE/IEEE 1588 and SETS architectures
• Ultra-low jitter performance of 95 fs typ (12 kHz to 20 MHz)
• Enhanced hitless switching minimizes output phase transients
• Pin or software controllable DCO provides precise timing adjustment

Clock Generators, PLLs, Frequency Synthesizers Applications

• Synchronous Ethernet (SyncE) ITU-T G.8262 EEC Option 1 & 2
• Telecom Boundary Clock (T-BC) as defined by ITU-T G.8273.2
• IEEE 1588 (PTP) slave clock synchronization
• Stratum 3/3E, G.812, G.813 network synchronization

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and temperature range. Confirm RoHS-6 compliance status prior to integration. Factory pre-programmed devices require unique numerical sequences assigned via ClockBuilder Pro software. Ensure serial interface compatibility with I2C or SPI protocols during system design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model for applications requiring high-frequency synthesis flexibility and ultra-low jitter. Verify that the required output frequency range fits within the 718.5 MHz differential limit. Ensure external reference inputs (TCXO/OCXO) are compatible with the REF/REFb pins for holdover accuracy. Use ClockBuilder Pro software to configure loop bandwidths and DCO settings for specific synchronization standards.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The SI5348 family includes variants like SI5348A and SI5348B, differentiated by output frequency ranges. The 'E' denotes the Rev E silicon revision, while 'GMR' indicates tape and reel packaging. This component serves as a central timing element in telecom infrastructure, replacing legacy discrete PLL solutions with a monolithic integrated approach.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

SI5348B-D-GM is listed as a similar alternative part number.