In {HEAD ~ a memory device} employing {TAIL ~ the output driver}, the blocking polarity potential is applied when the memory is in a state which does not activate the output driver 
employing
In { HEAD ~ a memory device } employing { TAIL ~ the output driver } , the blocking polarity potential is applied when the memory is in a state which does not activate the output driver
OTH 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 OTH OTH OTH OTH OTH