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Damaged SN74LVC2G

user4864920
Prodigy 10 points

Hello all

I have a problem with SN74LVC2G17DBVR (U9). There are two devices: slave and master (two PCBs). They are connected by connector and PCB tracks. Total length of each track is c.a. 80mm. In 5% cases (100 of 2k parts) the IC has been damaged but other works well. The damages may be such as: short on input/output ‘A’ gate and/or short on input/output ‘B’ gate. What is the reason of problem and how can I improve my circuit to eliminate it? Can I send to TI damaged parts to analysis them? 

Thanks

Pawel

  • 0
    TI__Guru 63130 points
    Hi Pawel ,

    what is the normal operating current being drawn at the output and what.
    you might replace R39 with higher resistor to see limiting the current helps it .
    would like to see scope shots on txd1 and rxd1 as well.
    having a small resistor on the long trace at TXD could help as well instead of going straight into the cap.