SI5345D-B04221-GMR

Clock Generators, PLLs, Frequency Synthesizers Overview

The SI5345D-B04221-GMR is a jitter attenuator and clock multiplier featuring four inputs and ten outputs. It supports differential input frequencies from 8 kHz to 750 MHz and LVCMOS inputs up to 250 MHz. Output frequencies range from 100 Hz to 350 MHz for differential signals and 100 Hz to 250 MHz for LVCMOS. The device operates on a 1.8 V core voltage (VDD) and a 3.3 V analog supply (VDDA), with independent output supplies configurable at 3.3 V, 2.5 V, or 1.8 V. It utilizes a 64-QFN package and functions within a temperature range of -40 °C to +85 °C.

Clock Generators, PLLs, Frequency Synthesizers Feature Summary

• Generates any combination of output frequencies from any input frequency using DSPLL and MultiSynth technologies.
• Supports free-run, synchronous, and holdover modes with automatic or manual hitless input clock switching.
• Features fully integrated loop filters and digitally programmable jitter attenuation bandwidth for optimized performance.
• Includes in-circuit programmable non-volatile memory to ensure known frequency configuration upon power-up.

Clock Generators, PLLs, Frequency Synthesizers Applications

• OTN muxponders and transponders
• 10/40/100 G networking line cards
• GbE/10 GbE/100 GbE Synchronous Ethernet (ITU-T G.8262)
• Carrier Ethernet switches
• SONET/SDH line cards

Clock Generators, PLLs, Frequency Synthesizers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm factory preprogramming details. Ensure the component matches the required RoHS compliance standards. Confirm that the serial interface configuration aligns with system requirements before integration.

Clock Generators, PLLs, Frequency Synthesizers Selection Notes

Select this model when fractional synthesis is not required and output frequencies are limited to 350 MHz. Verify compatibility with the desired output signal formats such as LVDS, LVPECL, LVCMOS, CML, or HCSL. Ensure the external crystal frequency falls within the recommended 25 MHz to 54 MHz range for optimal jitter performance.

Clock Generators, PLLs, Frequency Synthesizers Part Context

This component belongs to the Si5345 family of jitter attenuating clock multipliers. It shares architectural similarities with the Si5344 and Si5342 models but provides ten output channels compared to fewer in other variants. The Rev D datasheet defines its operational parameters and electrical specifications.

Clock Generators, PLLs, Frequency Synthesizers Replacement Considerations

Si5345B-D-GMR

Clock Generators, PLLs, Frequency Synthesizers FAQ

What is the maximum output frequency for the Si5345D variant?

The maximum output frequency for the Si5345D variant is 350 MHz for differential outputs and 250 MHz for LVCMOS outputs.

How does the device handle input clock failure?

The device automatically enters holdover mode if the selected input clock becomes invalid and no other valid inputs are available, using stored historical frequency data to maintain output stability.

Can the device switch between input clocks without glitches?

Yes, the device supports glitchless input switching for frequencies up to ±500 ppm apart and hitless switching for fractionally related frequencies.