Do I need level shifter for both high_to_low and low_to_high

[jeffreycui]

Hi,

Do I need level shifter for both high_to_low and low_to_high direction ?

thanks

 

[shhrikant1]

Re: Do I need level shifter for both high_to_low and low_to_

Yes , you need a level shifter , for both high to low & low to high

but you can use , SRL , ROR , ROL operators in VHDL to make your life a little easier

 

[jeffreycui]

Thanks for the reply.

Could you tell me why I need level shifter from high-to-low ?

 

[karesz]

Re: Do I need level shifter for both high_to_low and low_to_

... why I need level shifter from high-to-low ?

Hi,
because you will "backpower" your circuit if input is (usually) more higher as a P/N voltage, or ~0.6V.
You can become some unwished effects as i.e. latch-up, or minimum to high power needs...
K.