MAX3232: DOUT2 issue

Mahendra A G

Part Number: MAX3232

Tool/software:

Hi Team,

We are facing an issue with MAX3232, as the DOUT2 is shorting with GND(becomes 0E wrt GND) when the board is powered ON and a transaction appears on DIN2, we have used NUP2105L for ESD,, and the pin becomes OPEN once board is turned OFF.

over 1 year ago

0 BOBBY over 1 year ago

TI__Guru 74781 points

Mahendra,

Do you have a schematic we can review?

Are you performing any kind of stress tests to the part?

-Bobby

0 Mahendra A G over 1 year ago in reply to BOBBY

Prodigy 20 points

Hi,

Please find the sch snippet,

0 BOBBY over 1 year ago in reply to Mahendra A G

TI__Guru 74781 points

Hi Mahendra,

I don't see an issue with how the device itself is set up.

The ESD diode looks like it clamps outside of the absolute max rating. The clamping voltage is 40V~44V for the ESD strikes while our device has an absolute max voltage on the receivers is 25V and the drivers are 13.2V so it's not going to protect the device very well during the clamping event.

You probably want to get a TVS diode that can clamp below 13.2V since the damage you are seeing is on the Driver side.

-Bobby

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MAX3232: DOUT2 issue