Please see the attached document for Frequently Asked Questions (FAQ) and their answers regarding the Si5380 Ultra-Low Phase Noise, 12-output JESD204B Clock Generator.


The topics from the Table of Contents are listed below.


Frequency Plan and Clock Design Decisions

What is the output frequency range of the Si5380?

What output frequency restrictions does the Si5380 have?

What development software/tools do you have available to use with the Si5380?

Are there any restriction on output clock placement?

How do I select proper jitter attenuation bandwidth?

Does the device support automatic input clock selection and does it support hitless switching?

Is there a recommended full device programming procedure?

Can I change device settings in my system at runtime?

Can I change between several different frequency plans without fully re-configuring the device?

Can I change one output frequency without disturbing other output(s)?

Does the Si5380 support JESD204B operation?

How much power will my frequency plan draw?

I need to know the phase noise of my frequency plan, but am not able to make these measurements.

I need more than 12 outputs, what can I do?

Does the Si5380 support Zero-Delay Buffer operation?

PCB Design and Layout Guidance

Where can I find the package and PCB footprint information?

Do you have layout recommendations I should follow?

Do I need to put thermal vias under the E-pad of the device in my PCB layout?

Do you have a list of items to check during the schematic review?

Where can I find the IBIS model for the Si5380?

Where can I find the Si5380 schematic footprints and symbols?

What frequency options are available for the XA/XB connections?

I don’t want to use a crystal with the Si5380. Can I use an XO or TCXO as the XA/XB reference instead? And if so, how do I interface an external oscillator to the device?

Are there any power supply filtering requirements or recommendations?

Is there any specific power supply sequencing requirement?

What serial interfaces does the device support?

Where can I get detailed material composition information on these devices?

Is the part RoHS compliant?

What is the Moisture Sensitivity Level (MSL) rating for the Si5380?

What is the recommend profile for solder reflow process? 


  • Timing
  • Knowledge Base Articles
  • Clocks