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AMC1311: Question about IN terminal voltage before VDD1 powering up.

Kazuya Nakai59
Guru 19560 points
Part Number: AMC1311

Hello guys,

One of my customers is considering using AMC1311 for their new products.

At this moment, they have the following question.
Could you please give me your reply?

Q. In their system, AMC1311 "IN" terminal is applied 1.5V~2V prior to VDD1 powering up.
     AMC1311 datasheet says at 8.3.1 Analog input section that if the input voltage VIN exceeds the range specified
     in the Absolute Maximum Ratings table, the input current must be limited to the absolute maximum value
     because the electrostatic discharge (ESD) protection turns on.

     In this case, can AMC1311 device damage and latch up be avoided if the input current of "IN" terminal is limited less than +/-10mA?

Your reply would be much appreciated.

Best regards,
Kazuya.

  • 0
    Guru 224400 points

    Exceeding the current limit of 10 mA is likely to burn out the diode (and nearby components) before a latch-up happens.  Anyway, when you stay below 10 mA, there will be no damage.

    The ESD protection is a diode from the IN pin to VDD1. When the input voltage is larger than VDD1 + 0.5 V, a current flows into VDD1 and might partially power up all devices connected to it. I do not know if the circuit can handle this.