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TXB0304: TXB0304 overshot and undershot limit

Peter Wei
Expert 3320 points
Part Number: TXB0304

Hi Team,

As we have the -0.5~4.6V range as the absolute max rating on each signal pin. But it is for long term voltage, which can heat up the esd diode and damage the chip. Since the undershot and the overshot period is short, so normally it will not damage the IC. So do we have any spec can show how high and how long the overshot/undershot spike is, and it will be safe to the IC.

For example, the -0.622V undershot is only 7ns width, will it safe?

  • 0
    Guru 317370 points

    The negative overshoot is OK as long as the current is smaller than 50 mA. (This is probably the case, but I do not know the characteristics of the ESD diode.)

    There is no ESD diode between the input and VCC; the input must never exceed 4.6 V for any amount of time to prevent damaging the gate isolation. (ESD protection is done with the equivalent of a Zener, but it probably triggers at a higher voltage.)

    Consider proper termination of the signal line.

  • 0
    TI__Guru 62270 points

    Hi Peter,

    There is no concerns on the positive side as its not exceeding the abs max table.

    On the lower side, -0.6V is ok with limited current, as Clemens has rightly mentioned.

    What is the application usage?