A latchup is the inadvertent creation of a low-impedance path between the power supply rails of an electronic component, triggering a parasitic structure, which then acts as a short circuit, disrupting proper functioning of the part and possibly even leading to its destruction due to overcurrent. A power cycle is required to correct this situation.
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a condition that can occur in CMOS where Parasitic NPN and PNP Transistors are both Conducting and remain Conduction once the disturbance that started the Conduction is removed.
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