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TXB0108: The output gets stuck with multimeter capacitive load and does not recover on its own

Atul Gupta
Prodigy 10 points
Part Number: TXB0108
Other Parts Discussed in Thread: TXU0304, TXU0104, TXU0204

I find that the outputs gets latched and does not recover if loaded by a capacitive load, eg. A digital multimeter. In the datasheet is says there is a "one shot" pulse generated to improve the IO slew, but based on my experiment, it seems like it is level triggered and it can last forever, so it is not one shot. I have low voltage input toggling at 5Hz rate and try to measure the level with multimeter on the high voltage side. The high voltage side gets stuck at 1.6V and input is around .8V and it sinks/sources current such that 2mA driver cannot drive it between 0 and 1.8V,

Atul 

  • 0
    Guru 316470 points

    The one-shot definitely has a short timeout. But when you have ringing on the line, it can be triggered repeatedly and cause oscillations. Most multimeters cannot detected this; you'd have to use an oscilloscope.

    If possible, measure the signal after a buffer.

    If the signals are not actually bidirectional, better use unidirectional translators like the TXU0104/TXU0204/TXU0304.