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TXS0102 - Total supply current when the device is operating.

Kawai
Guru 19775 points
Other Parts Discussed in Thread: TXS0102

Hi Team,

Please give me a help about TXS0102 operation.

Our customer uses TXS0102 x2 in the SPI bus line. They observes total more than 40mA in the 3.3V power line only for these 2 devices. It seems 40mA is too high  for these devices.

What is the nominal current consumption for this device when it is  operating successfully, when having input and output signal ?

[Condition]
- VCCA=3.3V, VCCB=5.0V
- Connected devices have CMOS Input/Output

Best Regards,
Kawai

  • 0
    TI__Expert 6430 points

    Hi Kawai

    For TXS0102, the high current just occur at rising edge. the max current is less than 18mA when rising edge occurs.  If input hold at high, the current will depend on supply rail and pull-up resistor.

    Is 40mA current always on 3.3V voltage?

    Thanks

    Wei

  • 0 in reply to Wei Lang
    Guru 19775 points

    Hi Wei-san,

    Thanks for your continuous support.

    To your question the answer is YES.
    Cusotomer uses two TXS0102 with VCCA=3.3V and VCCB=5.0V.
    They always observe 40mA current when these devices are operating.

    I thought N2 switch may not be completely OFF, however, there would not be a leak from 3.3V line.

    I need to get some more information from the customer, but please help us  if you have any idea.

    Best Regards,
    Kawai

  • 0 in reply to Kawai
    TI__Expert 6430 points

    Hi Kawai,

    Could you ask customer to check I/O port voltage? If your comment is correct, the input and output voltage could be at some middle level

    Dose the data transmission occurr or I/O held at fixed state (high/low) when ICCA =40mA?

    Thanks

    Wei

  • 0 in reply to Wei Lang
    Guru 19775 points

    Hi Wei-san,

    In the customer measurement condition with data transmission (I/O is NOT held at fixed state.)

    I have confirmed the I/O voltages. Signal direction is from A side to B side.

    - VCCA=3.3V, VCCB=5.0V
    - VA1_High=3.3V, VA1_Low=0V
    - VB1_High=3.8V, VB1_Low=0V
    - VA2_High=3.3V, VA2_Low=0V
    - VB2_High=5.0V, VB2_Low=0V
    - OE is directly connected to VCCA

    - A1/B1 : SPI MOSI
    - A2/B2 : SPI CLK

    I could send you the measurement data if you could send me an Email or contact address.

    Best Regards,
    Kawai

  • 0 in reply to Kawai
    TI__Expert 6430 points

    Hi Kawai,

    I think VB1_High=3.8v is not correct. Please send data to me langwei@ti.com.

    Thanks

    Wei