SI5347A-D-GM

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5347A-D-GM is a jitter-attenuating clock multiplier featuring four independent DSPLLs in a 64-QFN package. It supports any-frequency conversion with an ultra-low typical jitter of 95 fs rms (12 kHz–20 MHz). The device accepts differential inputs from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz, generating outputs up to 720 MHz. Core voltage is 1.8 V ±5%, with independent output supplies at 3.3, 2.5, or 1.8 V. Operating temperature ranges from –40 °C to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Integrates four independent DSPLLs for flexible crosspoint routing between any input and any output.
• Supports hitless and glitchless input switching with automatic holdover modes.
• Features programmable jitter attenuation bandwidth per DSPLL ranging from 0.1 Hz to 4 kHz.
• Includes in-circuit programmable non-volatile memory for known power-up configurations.

Clock Generators, PLLs, Frequency Synthesizers Applications

• OTN Muxponders and Transponders
• 10/40/100G network line cards
• GbE/10 GbE/100 GbE Synchronous Ethernet (ITU-T G.8262)
• Carrier Ethernet switches
• Broadcast video

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific grade suffix 'A' confirms the 720 MHz maximum output frequency range. Confirm the 'GM' suffix indicates the standard QFN package and RoHS compliance. Ensure the datasheet revision matches the required electrical specifications for your design.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this part when four independent timing paths are required within a single component. Verify that the input frequencies fall within the supported differential or LVCMOS ranges. Ensure the application requires the specified ultra-low jitter performance and independent loop bandwidth control.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5347 family of dual/quad DSPLL jitter attenuators. The Si5347A variant specifically provides eight outputs with a maximum frequency of 720 MHz. Other variants like the Si5347B offer lower frequency limits, while the Si5346 provides a dual-DSPLL version in a smaller package.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Public confirmed substitute part numbers: SI5347B-D-GM, SI5347C-D-GM, SI5347D-D-GM.

Clock Generators, PLLs, Frequency Synthesizers FAQ

How does the device handle input clock failure?

The device automatically enters Holdover Mode using stored historical frequency data if the selected input fails and no other valid inputs are available.

Can the device switch between inputs without glitches?

Yes, it supports glitchless input switching for frequencies up to ±500 ppm apart and hitless switching for frequency-locked inputs.

What reference options are supported?

It supports an external crystal on XA/XB pins (25–54 MHz) or an external reference clock (REFCLK) mode.