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