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