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TXS0108E: The drive capability of TXS0108E

Part Number: TXS0108E
Other Parts Discussed in Thread: TPS55288, TXU0304, TXU0104, TXU0204


We found a question in the application of TXS0108E.

In our application , VCCA=1.8V , VCCB=3.3V.

we connect A1 pin to the IO of FPGA  1.8V bank and B1 pin to the EN pin of TPS55288.

There is a 1K pull-down resistor  on the EN pin of TPS55288.

The voltage on B1 pin drop from 3.3V to 0.9V in this condition .

We would like to ask why the TXS0108E can't drive the EN of TPS55288 ? 

The current on the EN pin of TPS55288 is only 1mA.

The output current of TXS0108E is max 50mA.


Best regards