TXB0104: Drive Strength (Output Drive Current/Source Current and Sink Current)

Hello Vijetha,

Here is an FAQ that discusses the different Auto bidirectional translators and should answer your question: 

The TXB family has the highest drive strength when compared to the other auto bidirectional translators. However, these devices have little to no drive. Is each line bidirectional? Because a device like the SN74AXC4T245 will have much better drive strength.

Thanks!

-Karan

Automatic direction sensing requires that other devices be able to override the voltage at the I/O pins. Therefore, all translators with automatic direction sensing must have a very weak drive strength.

The TXB's guaranteed drive strength is implied by the test conditions for V_OL/V_OH; it's 20 µA.

My requirement is 

I have 4 nos of GPIOs between 2 Processors which run at different Voltages. The direction (Input/Output) of each GPIO  is different at different instances. The translators of SN74 series may have direction controls for minimum 2 channels. But based on my requirement  I may need direction control for each channel or auto direction control.

I see very less drive strength of 20uA as mentioned by you. This may not be sufficient for our GPIOs. What is the better solution you have? a 4 bit Translator with Direction control for each channel or Translator with Auto Direction control  having good drive strength or any other option?

Regards,

Vijetha