Patent ID: 7973550

Claim:
A semiconductor device test apparatus comprising: a test unit on which a semiconductor device under test is disposed; an automatic test equipment unit that initiates testing and that makes a testing conclusion; and an interface unit, interposed between the test unit and the automatic test equipment unit, that compares a predicted test result signal with a test result signal from the test unit and outputs to the automatic test equipment unit: a comparison signal that indicates whether the semiconductor device is a failure or not, or a comparison signal that indicates whether a specific bit failure has occurred or not, wherein the interface unit comprises: a first comparator that outputs the comparison signal that indicates whether the semiconductor device of the test unit is a failure or not, and a second comparator comprising a phase selector, the second comparator configured to output on a bit-by-bit basis the comparison signal that indicates whether a specific bit failure occurs in the semiconductor device of the test unit or not.