Patent ID: 7043675

Claim:
A logic circuit test apparatus for testing a logic circuit having a plurality of input terminals and a plurality of output terminals by inputting original test signals to the input terminals of the logic circuit and testing output signals from the output terminals of the logic circuit, the logic circuit test apparatus comprising: a common test signal generating circuit which groups the input terminals of the logic circuit on the basis of logic states of original test signals to be applied to the respective input terminals of the logic circuit and outputs common test signals from common test signal output terminals thereof smaller in number than the input terminals of the logic circuit; an input connection switching circuit which switches connections of the common test signal output terminals of the common test signal generating circuit with the input terminals of the logic circuit so as to convert the common test signals into the original test signals and apply the original test signals to the input terminals of the logic circuit; a common expected signal generating circuit which groups the output terminals of the logic circuit on the basis of logic states of expected signals to be outputted from the respective output terminals of the logic circuit in association with the original test signals and outputs common expected signals from expected signal output terminals thereof smaller in number than the output terminals of the logic circuit; an output connection switching circuit which switches connections of the output terminals of the logic circuit with output signal measurement terminals provided in a one-to-one correspondence with the expected signal output terminals of the common expected signal generating means so as to compare the output signals outputted from the respective output terminals of the logic circuit with the common expected signals; and a connection switching control circuit for synchronously controlling the input connection switching circuit and the output connection switching circuit.