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MAX3232: DOUT1 breaks

Hanno Reimer
Intellectual 1960 points
Part Number: MAX3232


Tool/software:

on behalf of my customer:

We have a problem with MAX3232. 
The RS232 DOUT1 breaks and the levels at V+ and V- do not look normal.
Unfortunately, the defects only occur at the end customer, so the operating conditions are not known. 
In the circuit, the DIN1 pin is open, can this possibly lead to an error?

Is there a chance to have the defective devices inspected by TI to identify the root cause, why the devices break? 

thanks and bye 
Hanno 

  • 0
    TI__Guru* 77921 points
    Hanno Reimer said:
    In the circuit, the DIN1 pin is open, can this possibly lead to an error?

    I wouldn't expect this to directly cause damage to the device. Normally leaving an input pin floating will just cause more current consumption. 

    Hanno Reimer said:
    Is there a chance to have the defective devices inspected by TI to identify the root cause, why the devices break? 

    Generally if a part goes through FA, it doesn't directly tell why the device broke. Only that it experienced some kind of electrical over stress. 

    Do you have a schematic I can review? 

    Is it just one device that broke?

    Is it possible the pin was shorted to something?

    Does the damage occur after some use or directly after being hot plugged into something?

    -Bobby

  • 0 in reply to BOBBY
    Prodigy 20 points

    after a redesign of our board involving the MAX3232 the DIN was (accidentally) left open.

    After the redesign our customer started to see the failure.

    DOUT is not working and you can see that V+ and V- are not at the correct level and not stable. It seems that the charge pumps are not working correctly.

    The failure mostly happens at the end customer, but we have seen some cases directly after assembly of the device.

    We can't reproduce the failure in a lab setting.