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TXS0108E: Floating behaviour during acknowledgement on SDA

Part Number: TXS0108E

Hi,

I'm using the TXS0108E to translate a I2C bus from 3.3V to 1.8V. There is a problem during the acknowledgement from the slave. The SDA start to oscillate. This happens only during the acknowledgement. I do not use external pullup.

Here the screenshot from the oscilloscope.

Best regards,

Simon.