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TXS0102: one shot mechanism trigger condition

Lillian Liu(SH)
Intellectual 3000 points
Part Number: TXS0102

Hi team，

ASUS project M6500X use TXS0102 as an I2C level shift.
See from the datasheet, the device has a built-in pull-up 10k resistor inside, and a one shot mechanism that bypasses the 10k pull-up resistor, when testing, the one shot mechanism may trigger device protection. I would like to check what are the trigger conditions for the start of one shot mechanism and stop of the one shot mechanism during the operation?

If something other than the expected condition occurs, the one shot is switched off immediately or continuously triggered? 

Thanks 

BR

Lillian

  • 0
    TI__Mastermind 22015 points

    Hi Lillian.

    The one-shot is activated when a rising / falling edge is detected typically during switching (per the VIH and VIL levels) at about 30% to 50% Vcc, shorting the output to VCC or ground for a high or a low. With the one-shot duration designed to be activated between 10 ns and 30 ns, the internal pull-up of the TXS device drives the line high once deactivated, and maintains its’ steady state. Faster rising / falling input edges and the load capacitance should be considered while also ensuring < 70 pF to help avoid expiring the one-shot before the output reaches stead state.

    Please also see  “A Guide to Voltage Translation with TXS-Type Translators” and section 8.3.2 and 8.3.3 for considerations to help with avoiding expiring the one-shot and false triggers, thanks.

    Best Regards,

    Michael.

  • 0 in reply to Michael Ikwuyum
    TI__Intellectual 3000 points

    Hi Michael,

    Thanks for your reply, another question:

    Except 10K ohm pull up, device is quickly pulled up by one shot module and PMOS, while in practical testing, one shot always work.
    So I'd like to check how much power does one shot and PMOS consume here?

    Thanks

    Lillian

  • 0 in reply to Lillian Liu(SH)
    TI__Genius 15990 points

    Hey Lillian,

    Unfortunately, we do not spec the power consumption of the one shot circuitry, but the power consumption from this architecture should be negligible compared to the actual switching of the device from the signals. If your main concern is calculating the power consumption of the device, then we need to look into static power consumption and dynamic power consumption. 

    Static power consumption is given by ICCx in section 6.5 of the datasheet, and dynamic power consumption can be calculated through formula in this FAQ.

    Regards,

    Jack