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