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arulmaniv's avatar
arulmaniv
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2 months ago

Cyclone V Clamping Diode Electrical Specification

Hi, Please provide the below information for the Cyclone V Device IO Banks signals. what is the clamping voltage for the internal diode when enabled. what is the normal protection voltage for IO ...
Configuration
Generic Io
quality|reliability
FvM's avatar
FvM
Icon for Super Contributor rankSuper Contributor
2 months ago

Hi,

did you see IO element schematic in device handbook? It shows clamping diode as silicon diode against VCCIO.

Most detailed specification of IO voltage characteristic can be found in IBIS files.

Not sure what you mean with "normal protection voltage". Did you review maximum ratings in datasheet?

 

  • arulmaniv's avatar
    arulmaniv
    Icon for New Contributor rankNew Contributor
    2 months ago

    We are currently reviewing the protection mechanisms for the Cyclone V device and would appreciate your assistance in clarifying the following details regarding the internal clamping diode configuration:

    1. Clamping Voltage (when enabled):
      Could you please confirm the clamping voltage level for the internal diode when it is enabled on the IO pins?
    2. IO Pin Protection Voltage (when clamping diode is disabled):
      What is the typical protection voltage range for the IO pins when the internal clamping diode is not enabled?

    This information is critical for ensuring compliance with our system-level ESD and surge protection requirements. We would appreciate any documentation or references you could share to support these specifications.

    Thank you in advance for your support.

    • AqidAyman_Altera's avatar
      AqidAyman_Altera
      Icon for Regular Contributor rankRegular Contributor
      2 months ago

      Hi,

      Please download the IBIS model for Cyclone V using the link below:

      https://www.altera.com/design/devices/resources/models/ibis

      Consulting the official Cyclone V IBIS files is a reliable method to understand the internal diode clamping voltage and IO pin protection at a detailed electrical level. For precise numerical values or simulation, use the IBIS files along with signal integrity simulation tools.

      Thanks.

    • AqidAyman_Altera's avatar
      AqidAyman_Altera
      Icon for Regular Contributor rankRegular Contributor
      30 days ago

      Hi,

       

      May I know if you have any other questions?

      Thanks

    • AqidAyman_Altera's avatar
      AqidAyman_Altera
      Icon for Regular Contributor rankRegular Contributor
      17 days ago

      Dear Customer,

      If there are no further inquiries, I will step back and allow the community to assist with any future follow-up questions.

      Thank you for engaging with us!

      Best regards,
      Altera Technical Support