At {TAIL ~ all other times} {HEAD ~ the clock input} is blocked or clamped to prevent spurious signals or power surge transients from altering the stored data 
At
At { TAIL ~ all other times } { HEAD ~ the clock input } is blocked or clamped to prevent spurious signals or power surge transients from altering the stored data
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH