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SN74LVC1G3157: SN74LVC1G3157DCKR: Pin1 short to Gnd

Part Number: SN74LVC1G3157

Hi experts,

            Below is the schematic. recently, we met several abnormal case, after analysis, found the Pin1 of this device short to ground.  Would you please help to check if potenial issue. 

Also, per reading datasheet,  seem S pin need a special circuit.  but by checking TI own ref design with this device which also didn't include this special circuit.  would you please suggest if this circuit is

necessary. thanks. 

  • The schematic is unreadable, and does not show what is connected to pin 1.

    The most likely cause of such damage is a negative voltage exceeding the absolute maximum rating.

    The S pin does not need a special circuit. Figure 13 shows an example application that is probably not related to your application.

  • Hello,

    Appreciate sharing this schematic! Can you help me understand voltage levels being applied to each pin during operation? For instance, what is the VDD level and input voltage on the A/B1/B2 pins? I also noticed that the B1 pin is being grounded and has a resistor. Are you limiting this current enough to comply with the absolute maximum rating of 128mA?

    Lastly, the circuit on the S pin is just an example application of controlling the S pin which controls which switch is closed. This pin just needs a "high" or "low voltage to toggle switching.

    Thanks!

    Bryan

  • Hello,

    Been about 2 weeks since our last response. I will close this thread for now, but please feel free to reopen if you would like to continue this conversation.

    Thanks!

    Bryan