Cheap and good way to feed 12v digital input

I am unable to make out how will it work..
I went through the datasheet too, bu cant make out..It would be kind of you, if you can elaborate please..

Just 2 parts, smaller footprint, low cost 5.5¢ per PCB (qty 1000)
High performance: 0-30V Input, Max 250MHz transistor frequency, Inverted 0-5V output

DTC114W Digi-Key $0.04844 each (qty 1000)
ERJ-2RKF2201X Digi-Key $0.00699 each (qty 1000)