Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: tristantech on April 07, 2010, 07:34:52 PM
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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?
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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 (http://focus.ti.com/docs/prod/folders/print/sn74lvc4245a.html) 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).