which kind of design of level shifter suitable for high frequency data transfeing in range of 1MHz?
Take a look at the isolators section on digi key 

https://www.digikey.com/products/en/isolators/digital-isolators/901 

or level shifters.  

https://www.digikey.com/products/en/integrated-circuits-ics/logic-translators-level-shifters/732