The EP3C5E144C8N Altera Cyclone III FPGA has a core voltage supply range of 1.15V to 1.25V. The I/O pins can operate at different voltage levels depending on the I/O standard used, but a common I/O voltage is 3.3V, according to some online resources.
Here's a more detailed breakdown:
Core Voltage:
The internal logic of the EP3C5E144C8N operates at a voltage range of 1.15V to 1.25V.
I/O Voltage:
The I/O pins can be configured to support different voltage levels based on the chosen I/O standard (e.g., LVTTL, LVCMOS, etc.).
Common I/O Voltage:
A common I/O voltage for this device is 3.3V, but it can be different depending on the specific application and the chosen I/O standard.