ESD PROTECTION AGAINST CHARGE COUPLING

摘要

PURPOSE: An ESD protection against charge coupling is provided to prevent a damage of a pre-driver circuit without functional loss of an input/output buffer. CONSTITUTION: A first transistor(102) is composed to connect an output unit to a high logic supply rail. A second transistor(104) is composed to connect the output unit to a low logic supply rail. A pre-driver circuit operates a gate of the first and second transistors. A first resistance(106) reduces a first current induced by ESD between the pre-driver circuit and first transistor. A second resistance(107) reduces a second current induced by ESD between the pre-driver circuit and second transistor.