In the case of an N channel device in the output driver, the blocking polarity potential is {HEAD ~ a negative voltage} applied to the gate of {TAIL ~ the transistor} 
In the case of an N channel device in the output driver , the blocking polarity potential is { HEAD ~ a negative voltage } applied to the gate of { TAIL ~ the transistor }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL