Forum Discussion

Honored Contributor

14 years ago

Cyclone III 3.3 volt tolerant?

I am using an Altera Cyclone III development board. Into pin J4 which is suppose to be 2.5 volts - is it 3.3volt tolerant?

Honored Contributor

14 years ago

I can only guess, which board and pin J4 you mean. Altera Cyclone III 3C120 Development Board? Signal HSMA_TX_D_P11 connected to FPGA pin J4?

All I/O pins are 3.3V tolerant, you should however keep the tolerated overshoot range for safe Cyclone III operation.