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TXS0104E - How can I tell if Partial Power Down Mode [Ioff] is supported?

Other Parts Discussed in Thread: TXS0104E, TXB0104, TXB0304, TXS0101, TXS0102

Hi,

Does TXS0104E support the partial power-down mode although it isn't mentioned in the TXS0104E data sheet ?

Best regards,
Kato

  • Sadanori,

    TXS0104E does not support Partial Power Down mode [Ioff].

    Partial Power Down prevents device damage by limiting the leakage current between a supply pin that has been powered down to 0V and its associated input pin, output pin, or combined input/output pin that are biased to a specific voltage. All TI standard logic devices with the Ioff specification allow only 100 uA of maximum current.

    Since the TXS0104E does not support Ioff:

    1. If VCCA is 0V and pins A1:A4 are biased (e.g. 1.80V), then the current flow from the A1:A4 pins through to VCCA would be much larger than 100 uA.

    2. If VCCB is 0V and pins B1:B4 are biased (e.g. 3.30V), then the current flow from the B1:B4 pins through to VCCB would be much larger than 100 uA.

    TXB0104 and TXB0304 are two alternatives that DO support Partial Power Down [Ioff]. Could these translators work for you instead?

    Best Regards,
    Nirav
  • Hi Nirav-san

    Thank you for your quick response.
    I understood and will suggest TXB0104 instead of TXS0104E to our customer.

    Best regards,
    Kato

  • Sadanori,

    If you can post information on the customer application, I can make sure that the TXB0104 is the proper choice. For example, what type of signals are they trying to translate (e.g. SPI, UART, etc)?

    Best Regards,
    Nirav

  • Hi Nirav-san,

    Our customer will try to use TXS0104E with I2C or SPI interface.

    By the way, according to the data sheet of TXS0101 and TXS0102 these parts support the partial power-down mode.
    In addition, it seems that TXS0104E supports it in the following application report.
    So, could you please double check it ?

    http://www.ti.com/lit/an/scea044/scea044.pdf

    Best regards,
    Kato

  • Kato - My feedback is below:

    Sadanori Kato said:

    Our customer will try to use TXS0104E with I2C or SPI interface.

    Understood. In that case, the TXS family of translators is a suitable choice, since it is auto-directional, and can support open-drain (I2C) as well as push-pull (SPI) interfaces. The TXB family of translators can support push-pull, but not open-drain interfaces.

    Sadanori Kato said:

    By the way, according to the data sheet of TXS0101 and TXS0102 these parts support the partial power-down mode.
    In addition, it seems that TXS0104E supports it in the following application report.
    So, could you please double check it ?

    http://www.ti.com/lit/an/scea044/scea044.pdf

    I am sure that the TXS0104E does not support Ioff. I went through the design database to make sure.

    Also, shown below is a portion of the application note that you mentioned. It states that Ioff is supported in TXS devices that do not have IEC level ESD protection. The TXS0104E does have IEC level ESD protection, so therefore it does not support Ioff.

    From the application note (SCEA044):

    From the TXS0104E datasheet:

    Best Regards,
    Nirav

  • Hi Nirav-san,

    Thank you for your commnet.
    I understood and will inform our customer of this information.

    Best regards,
    Kato

  • Sadanori,

    In the future, you can use this post to determine if a Level Translator supports Partial Power Down Mode.

    Check the Electrical Characteristics section of the datasheet for the parameter 'Ioff'. If it exists, then the device supports Partial Power Down Mode.

    For example, shown below is a portion of the TXS0101 datasheet. Since it lists 'Ioff', it therefore supports Partial Power Down Mode:

    Now look at the TXS0104E datasheet, notice that there is no 'Ioff'. This means that Partial Power Down Mode is not supported.

    Hope this helps you out in the future. Thanks.

    Best Regards,
    Nirav

  • Hi Nirav-san,

    Thank you for your strong support.
    I have also found the presence or absence of Ioff characteristics which you mentioned.

    By the way, could you please give me your advice about the following post ?

    http://e2e.ti.com/support/interface/voltage_level/f/391/t/536729

    Best regards,
    Kato