What might happen if an unused dedicated input or unused dedicated I/O pin on my Altera® device is left floating? - What might happen if an unused dedicated input or unused dedicated I/O pin on my Altera® device is left floating? Description If your dedicated input or IO pins are left floating, then the input transistors might fall outside of the saturation or cut-off region. As a result, the device could draw additional current and increase the device's power consumption. Additionally, if left floating, these pins are apt to switch (they behave similar to antennas) which can inject noise into the device. As such, Altera recommends connecting these dedicated pins to the appropriate logic level defined by the Altera® software pin file (typically either VCC or GND). Related Articles Do Altera devices have fail safe circuitry for differential receivers? If I set the unused pins as inputs tri-stated or inputs tri-stated with weak pull up in Quartus II software, do I have to connect the pins on the PCB? Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']