Patent ID: 7383477

Claim:
An interface circuit for using a low voltage logic tester to test a high voltage IC, the interface circuit is between the high voltage IC and the low voltage logic tester, a high voltage power supply is used to provide high voltage power to the high voltage IC, the interface circuit comprises: a first controller for connecting with the output pins of the high voltage IC to conduct an open and short test, a function pattern test, or a standby current test of the high voltage IC by internal control switches thereof; an attenuator between the first controller and the low voltage logic tester for attenuating each output of the high voltage IC to a voltage level that the low voltage logic tester can accept, and a second controller between the first controller and the low voltage logic tester, and a plurality of control switches in the second controller are used for cooperating with the first controller to control each output pin of the high voltage IC to be connected with the attenuator or not.