Fast voltage translation from 3.3v to 5.7v
If your capacitance loading is light (as in the 15pF load shown below) and your power budget generous, you can just use a single transistor inverter. eg. 







simulate this circuit &ndash; Schematic created using CircuitLab

Rise time should be in the 25ns range typically and fall time better (10%-90%). If you only need 50ns typical you can increase R1. 

Do not use a larger than necessary MOSFET for M1 or the drain source capacitance and Miller capacitance (assuming some source resistance) will kill your speed.