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TXS0102: switching direction query under different conditions

Leo Chow
Expert 3120 points
Part Number: TXS0102

Hi,

 With reference to the datasheet Section 9.2 of circuit implementation, I have some questions which will need advise as per below:

1. If the 3.3V system has a pull up of 3.3V, then after 10s, 1.8V system controller internally set to pull high, how will TXS0102 determine which direction it will switch to?

2. If A1-B1 is an active low signal, 3.3V system controller internally set to pull high, and 1.8V system controller internally also set to pull high, then if 1.8V system tries to pull the signal low when activity is triggered. Will the pull low be able to be detected by 3.3V system?

3. At the same time A2-B2 is an active low signal, the 1.8V system controller internally is set to pull high, and 3.3V system will pull the signal low when activity is triggered. Will the pull low be detected by the 1.8V system controller?'

Regards,

Leo

  • 0
    Guru 317370 points

    Please look at figure 10 in section 8.3.1. If no external device forces A or B low, then R1 and R2  pull the A/B pins high. If an external devices forces any pin low, then the now higher voltage at the gate of pass transistor N2 makes it switch on, pins A and B are connected, and the external device therefore pulls both A and B low. (The external devices sinks the total current flowing through both R1 and R2.)

    Please note that everything is symmetrical, and both directions are always active at the same time.

    (The one-shot circuits speed up low-to-high transitions, but does not affect the basic mechanism.)