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AGofs
Novice
189 Views

Connection between 3.3V CMOS/TTL signal and 2.5V bank.

Hi everyone,

I'm working with Cyclone V-GX .

Is it possible to connect 3.3V signal to FPGA pin (as an incoming port), which located on 2.5V bank (without any damage to this pin)?

it was possible at Cyclone III,as I knew,....

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2 Replies
ChiaLing_T_Intel
Employee
75 Views

​Hi AGofs,

 

Thank you for contacting Intel Community. According to Cyclone V device handbook, the Cyclone V architecture supports the Multivolt I/O interface feature that allows Cyclone V devices in all packages to interface with I/O systems that have different supply voltages. However, please be noted that the VCCIO of 2.5V can only have the output signal 2.5V. Please refer to the Table 5.10 for the allowable input signal of different VCCIO:

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/cyclone-v/cv_5v2.pdf

 

To understand more in the Cyclone V multivolt application, you may refer to AN447 document for details.

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/an/an447.pdf

 

Furthermore, you may refer to the solution link below for understanding on how can devices support Multivolt input when the I/O specification limit Vih relative to VCCIO voltage.

https://www.intel.com/content/www/us/en/programmable/support/support-resources/knowledge-base/soluti...

 

Thank you

 

Regards,

Chia Ling

 

AGofs
Novice
75 Views

Good morning Chia Ling,

Thank you a lot for a quick and efficient answer!

I think you can close the case.

Thank you once again,

AGofs.

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