Patent ID: 6323668
Filing Date: 2001-11-27
Classification: G01R

Abstract:
An IC testing apparatus comprising:a current detector that is connected between a power supply terminal of an IC under test through which any current flow is taken out and a point of common potential, said current detector comprising a current detecting resistor;a short-circuit switch that is connected in parallel with the current dectector, under the condition that a large current is consumed by the IC under test, the large current is bypassed by the short-circuit switch, while the short-circuit switch is off, a voltage produced across the current detecting resistor is measured, and a current of the IC under test during its quiescent state is measured on the basis of the measured voltage, thereby to determine whether the IC is conforming or non-conforming article depending on whether or not the value of the measured quiescent current is equal to or less than a predetermined value;control means for detecting, in a control mode in which the short-circuit switch is controlled to its off state, the rising of a voltage produced across the current detecting resister to or above a predetermined value, thereby to perform a control in which the short-circuit switch is returned to its on state; anddelay control means provided in a control circuit which controls the short-circuit switch from its on state to its off state, and for delaying the inverting operation of the short-circuit switch from on state to off state to cause the short-circuit switch to be gradually turned to its off state.