When the semiconductor memory device is set to {HEAD ~ a specific mode} for suppressing {TAIL ~ a power consumption}, the LVTTL is used for taking in an external signal 
for suppressing
When the semiconductor memory device is set to { HEAD ~ a specific mode } for suppressing { TAIL ~ a power consumption } , the LVTTL is used for taking in an external signal
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH