tia_design
Advanced Member level 4
Still ESD issue
Very common ESD structure for an output pin is two diodes, one is connected to VDD, and the other is connected to VSS, both are reverse biased in normal operation.
For this kind of ESD structure, if output pin's voltage is within the range of VDD and VSS, the current through these two diodes are just leakage current. But in some application, if VDD and VSS are reversed, both of these two diode will be turned on and the current running through those diodes will be unlimited. To limit this current in the diodes, what kind of ESD structure has to be used?
Very common ESD structure for an output pin is two diodes, one is connected to VDD, and the other is connected to VSS, both are reverse biased in normal operation.
For this kind of ESD structure, if output pin's voltage is within the range of VDD and VSS, the current through these two diodes are just leakage current. But in some application, if VDD and VSS are reversed, both of these two diode will be turned on and the current running through those diodes will be unlimited. To limit this current in the diodes, what kind of ESD structure has to be used?