2.5 Unused or Unconnected Pins

Unused or unconnected pins should not be allowed to float as inputs. It is recommended that unused inputs be ganged together and connecting via a 1 kΩ resistor to digital ground, individually or in multiple groups through 1 kΩ resistors as the PCB layout permits. This minimizes the chip vulnerability to ESD and radiated EMI due to a high voltage discharge event.