3.3v to 5v databus bidirectional translator

Samuel Loho

Other Parts Discussed in Thread: SN74LVC245A, SN74AVC8T245, SN74LVC8T245

Hi,

I am trying to do a databus bidirectional translator between a 3.3v micro and 5v peripheral using SN74LVC245A. It says in the datasheet that it can be used as a translator between a mixed 3.3v/5v system. Can you advise in how one configure this chip for this purpose?

Regards,

Samuel

over 12 years ago

0 Chris Cockrill over 12 years ago

TI__Mastermind 46480 points

This part (SN74LVC245A) can be used to translate down 5V to 3.3v. It will not translate 3.3V to 5V

The easiest solution would be to use a duel voltage transator. SN74AVC8T245 or SN74LVC8T245

0 Samuel Loho over 12 years ago in reply to Chris Cockrill

Prodigy 30 points

So, when the datasheet says that it can be used as a translator in a mixed 3.3v/5v system is unidirectional? i.e. one chip for 3.3v-to-5v and another for 5v-to-3.3v since it can accept voltages up to 5.5v.

If that is the case, then the bidirectional functionality only applies on a system with the same voltage level? but not on a mixed system (e.g. 2.5v/3.3v or 3.3v/5v)?

0 Chris Cockrill over 9 years ago in reply to Samuel Loho

TI__Mastermind 46480 points

That is correct.

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3.3v to 5v databus bidirectional translator