DLPS031C December 2013 – August 2015 DLPC6401
PRODUCTION DATA.
To avoid potentially damaging current caused by floating CMOS input-only pins, TI recommends that unused ASIC input pins be tied through a pullup resistor to its associated power supply or a pulldown to ground. For ASIC inputs with an internal pullup or pulldown resistors, it is unnecessary to add an external pullup or pulldown, unless specifically recommended. Note that internal pullup and pulldown resistors are weak and should not be expected to drive the external line.
Unused output-only pins can be left open.
When possible, TI recommends that unused bidirectional I/O pins be configured to their output state such that the pin can be left open. If this control is not available and the pins may become an input, then they should be pulled-up (or pulled-down) using an appropriate resistor.