Electronics > Beginners

Logic Level Shifters?

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FrankBuss:

--- Quote from: theatrical scene on January 22, 2019, 10:46:38 pm ---That looks very cool! I like the ability to control the DIR pin. Out of interest, is there a reason why I might use http://www.ti.com/lit/ds/symlink/txb0108.pdf over a 74LVC8T245 or is the TXB more useful in a bidirectional application?

--- End quote ---

If you know the direction, it is always better to use a chip where you can set it. Look here for details:

https://www.eetimes.com/document.asp?doc_id=1231111


--- Quote ---Another implementation (Figure 4) does not require the direction control signal, but in turn has a restriction on the drive strength of the output transistors. In a DC state, the output drivers can maintain a high or low, but are designed to be weak, so that they can be overdriven by an external driver when data on the bus starts flowing in the opposite direction.

--- End quote ---

Depends on your application, if this works for you.

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