Patent ID: 7058865

Claim:
An apparatus for testing a semiconductor integrated circuit comprising: a test circuit board for exchanging signals with a semiconductor integrated circuit under test; and an ancillary test device which is disposed in the vicinity of the test circuit board and connected to the test circuit board; wherein the ancillary test device comprises digital circuit testing capability for testing a digital circuit included in the semiconductor integrated circuit under test; the ancillary test device comprises test pattern memory for storing a plurality of test pattern data sets corresponding to a plurality of test items for testing the digital circuit, a test pattern signal generator into which are written test pattern data selected from a plurality of test pattern data sets stored in the test pattern memory, and a control section for controlling an operation for the test pattern data selected from among the plurality of test pattern data sets stored in the test pattern memory and an operation for writing the selected test pattern data into the test pattern signal generator; and the ancillary test device generates a test input pattern signal for the semiconductor integrated circuit under test on the basis of test pattern data written in the test pattern signal generator and determines a test output pattern signal output from the semiconductor integrated circuit under test on the basis of the test input pattern signal, thereby testing a digital circuit of the semiconductor integrated circuit under test.