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AM26LV31E-EP: AM26LV31E-EP

Daniele Rafaiani
Prodigy 70 points
Part Number: AM26LV31E-EP

In an electronic board we are using the AM26LV31E-EP differential line driver.

For the LIGHTNING qualification test, we need to inject a burst of voltage pulses (in both polarities) into the individual outputs of the AM26LV31E-EP (protected with TVS).

The datasheet shown the Vo (Output voltage range) ABSOLUTE MAXIMUM RATINGS (–0.5V / 6V).

What does this parameter represent? Is it the maximum voltage that I can force at the output?

What is the maximum continuous voltage I can force in the driver outputs?

What is the maximum voltage pulse that the driver outputs can withstand (amplitude, duration, duty cycle)?

Thanks and best regards.

  • 0
    TI__Guru 62930 points
    Daniele, the Vo rating in the absolute maximum ratings table represents the largest voltage that can be present on the output without damaging device. However, it is important to note there are other constraints on the output as well.
    The Iok defines the max current that the output can handle when forced below ground and still not damage part. This is a relaxation of the Vo spec below ground, if the current is limited to less than the Iok specification.
    Also, the Io specification indicates that the current must be less then 150mA through the output in order to not violate the abs max spec.

    If your voltage forces below 0.5V below ground, then you must limit current (to the device) to less than 20mA, or the ESD diodes may be damaged.
    if voltage within abs max range of -0.5V to 6V, then current must be limited to 150mA or less.

    The absolute maximum specifications do not define short duration relaxations. All the above limits are based on continuous DC currents.

    This document may also help you understand these parameters a little more clearly.
    www.ti.com/.../szza036c

    Regards,
    Wade
  • 0 in reply to Wade Vonbergen
    Prodigy 70 points

    Thank you very much.

    We should withstand the LIGHTNING test as per RTCA/DO-160F Section 22 Category A3XXX.

    Each AM26LV31E-EP output is connected to a unidirectional Transient Voltage Suppression diode( TVS) with a clamping voltage of +5V.

    Therefore each output will have to withstand (one pin at a time) a burst of pulses of about +7V/130us and -900mV/130us. The time between each single stroke is about 2s.

    The stoke generator will be connected with 5Ohm resistor in series.

    Do you think we can withstand the LIGHTNING test?

    In this regard I found a discussion in the TI E2 Community:

    https://e2e.ti.com/support/interface/industrial_interface/f/142/t/111592

    but it is not clear to me if the TVS used are able to protect the AM26LV31E-EP outputs.

    Thank you very much.

  • 0 in reply to Daniele Rafaiani
    TI__Guru 62930 points
    Daniele, the other E2E post is referring to the same device. So, yes the TVS is indicated to be applied to drivers.
    This is a good reference to follow. Thanks for pointing it out.
    Regards,
    Wade