5 Volt tolerant output

[tristantech]

Hi,

I have a 5 volt lcd with 8 bi-directional data lines and a 3.3 volt processor. The the LCD will take a 3.3 volt input and a logic high, but the 5 volt output from the lcd is too much for the mcu.

What I have decided to do is use a 74**245 octal bus transceiver running at 3.3 volt. The 74245 can take a 5 volt input, but the datasheet says it has a 5 volt tolerant output. Does this mean, regardless of Vcc, The voltage on the input pin will be on the output pin?

[Soeren]

Hi,

I have a 5 volt lcd with 8 bi-directional data lines and a 3.3 volt processor. The the LCD will take a 3.3 volt input and a logic high, but the 5 volt output from the lcd is too much for the mcu.

What I have decided to do is use a 74**245 octal bus transceiver running at 3.3 volt. The 74245 can take a 5 volt input, but the datasheet says it has a 5 volt tolerant output. Does this mean, regardless of Vcc, The voltage on the input pin will be on the output pin?

Just use a SN74LVC4245A and be done with it. It's build for the purpose (Datasheet on the linked page and you may even sample it from another link on the page).