clros
Member level 2
Hi to all,
In a my project I am using an Altera/Intel Cyclone IV FPGA.
For some reason, the IO pins can be drivered with a negative voltage (-3.3V) that I would is interpreted as logic level 0.
The problem is that the IO pins of FPGA not support negative voltage.
I see in some circuit, that it used the BAT54 diode for protect the IO pins.
I have simulated the circuit and the voltage, if I use the BAT54, is only -400mV.
It is a good solution?
In a my project I am using an Altera/Intel Cyclone IV FPGA.
For some reason, the IO pins can be drivered with a negative voltage (-3.3V) that I would is interpreted as logic level 0.
The problem is that the IO pins of FPGA not support negative voltage.
I see in some circuit, that it used the BAT54 diode for protect the IO pins.
I have simulated the circuit and the voltage, if I use the BAT54, is only -400mV.
It is a good solution?