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