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Hi Rock,
The digital input pins (Din pin 12) should always be tied to a known voltage. This can be tied directly to Vcc or GND.
The Rin pins (pin 9) are designed to deal with a high-z case so these can be left floating. All output pins may also be left floating (pins 8, 10).
Let me know if you have any more qustions.
Regards,
Eric Schott