Dear expert,
In my schematic, there are TXB0104 for UART, LSF0102&TXB0104 for GPIO, and one SN74LVC8T245.
Could I use SN74 part for all interface? what is the limitation?
Could I learn from you what different between TXB/LSF/TXS/SN74 part?
Per my understand, drive capability is different.(TXB0304 > TXB0104 > TXS0104) Am I right?
If we have app note about this topic, please share with me. Thanks!
-Ben
Hi Ben,
I would essentially have to write a book to explain every difference -- let's see if I can make it short and simple:
LSF -- passive translator, works with open-drain and push-pull protocols. There's a video series explaining how these work:
TXS -- semi-passive translator, operates very similarly to LSF, but has some added features
TXB -- low-drive (20uA) buffered translator -- works like a buffer, but has a very weak output current that can be overdriven to change directions.
All of the above translators are "auto-bidirectional" -- meaning that the signal can change direction at any time without a control bit.
SN74LVC8T245 -- This device is a direction-controlled translator. A direciton bit must be used to determine if you are translating up or down, and signals cannot change direction individually or without warning. This device does not work with open-drain protocols like I2C.
