This allows the level shifter to be designed for optimal transitional performance without the sacrifice of {TAIL ~ a potentially long propagation delay} on {HEAD ~ the output nodes} 
This allows the level shifter to be designed for optimal transitional performance without the sacrifice of { TAIL ~ a potentially long propagation delay } on { HEAD ~ the output nodes }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD