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TXS0104E: not operating

Prodigy 140 points

Replies: 5

Views: 62

Part Number: TXS0104E

I am scanned the datasheet to make a preliminary circuit for a system translating a 3v3 embedded operation to a 1v8 sensor application. VCAA is operating at 1v8 and VCCB is 3v3. I have not been able to get an I2C communication across the device from B to A? OE is tied to the ground through a 20K pulldown resistor and also is toggled via a gpio of the 3v3 embedded side. I see OE needs to be on the VCCA side. Will the TXS0104 not operate with a 3v3 signal to it?

  • Hello,

    Yes, the device will operate with a 3.3V input to the OE pin when VCCA is 1.8V. See the recommended operating conditions, VIH for OE pin (5.5V max).

    Can you get an oscilloscope shot of the A1, B1, and OE pins during operation?


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  • In reply to Emrys Maier:

    Here is the screen shot: blue is B1, green is A1 and yellow is OE.

  • In reply to cy drollinger:

    Hey Cy,

    It looks like the OE signal is Low, this signal needs to be High to enable the device.

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  • In reply to Dylan Hubbard:

    Yes, well, if the OE is high the I2C lines from the embedded unit are knocked out.

  • In reply to cy drollinger:

    Hey Cy,

    So it sounds like whatever is on the A side is holding the line low.

    Check out our new AXC family of Voltage Translators! 

    Watch the Introduction to AXC Family to find out more about the family.