SI5348B-D08040-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5348B-D08040-GMR is a network synchronizer and jitter attenuator featuring three independent DSPLLs in a 64-lead QFN package. It supports differential output frequencies from 1 PPS to 718.5 MHz and LVCMOS outputs up to 250 MHz. Input ranges include external crystals (48–54 MHz), REF clocks (5–250 MHz), differential clocks (8 kHz–750 MHz), and LVCMOS clocks (8 kHz–250 MHz). The device operates on core voltages of VDD at 1.8 V ±5% and VDDA at 3.3 V ±5%, with independent output supplies selectable at 3.3 V, 2.5 V, or 1.8 V. It functions within a temperature range of –40 °C to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Three independent DSPLLs supporting flexible SyncE/IEEE 1588 and SETS architectures
• Ultra-low jitter performance of 100 fs typ (12 kHz to 20 MHz)
• Digitally controlled oscillator (DCO) mode for precise timing adjustment
• Programmable jitter attenuation bandwidth per DSPLL from 0.001 Hz to 4 kHz

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 'GMR' indicates tape and reel packaging rather than tray. Confirm that the numerical sequence 'D08040' corresponds to the intended factory pre-programmed configuration. Ensure compatibility with I2C or SPI serial interfaces for ClockBuilder Pro software configuration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when ultra-low jitter and flexible SyncE/IEEE 1588 support are required. Verify that the input frequency range matches the available reference sources. Ensure the output driver configurations meet the voltage requirements of the downstream loads.

Clock Generators, PLLs, Frequency Synthesizers Part Context

The Si5348 family includes variants like the SI5348A and SI5348B. The 'B' grade typically denotes specific electrical characteristics or output frequency limits compared to the 'A' grade. This component belongs to the multi-PLL clock family designed for telecom boundary and slave clocks.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.