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SHard2
Novice
148 Views

Stratix IV Max Clock Input Voltage

Hi

We have an existing board containing a EP4SE360F35I3 (F1152 PACKAGE).

 

I am trying to determine the maximum input Voltage that can be placed on a dedicated clock input pin (single ended). Specifically CLK8P and CLK10P.

 

CLK8P is bank 5C which is at 2.5V, CLK10P is bank 6C which is at 2.5V.

 

From the documentation a dedicated clock input pin, in single ended mode, complies to LVPECL, which is quoted elsewhere as having a maximum input Voltage of 2.625V.

 

However, I am confused by the 3.3V compliance/support for the I/O pins.

 

Ideally we would like to use a 3V clock signal on these clock pins and any advice would be much appreciated.

 

Best regards

Simon

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1 Reply
Rahul_S_Intel1
Employee
36 Views

Hi Simon,

 

 The LVPECL VCCIO is given as 2.65 V ( page no:22 of the below document) , not the input voltage to the LVPECL standard

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/stratix-iv/stx4_5v4.pdf

 

The LVPECL standard is been characterized in 2.5V IO standard , not in 3 V IO standard.

So from Intel , it is not recommended to connect t o 3V IO standard to LVPECL.

 

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