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