1.2.6 Voltage Selection
The EV74C12A features the capability to choose the voltage for the board (3.3V or 5V) by installing the correct resistor configuration in the R5 or R6 positions. By default, R5 is installed for 3.3V power.
Note: Populate only one resistor, either R5 or R6, to select the
input voltage for the board (3.3V or 5V).