| 摘要 |
PROBLEM TO BE SOLVED: To enable a functional test to be carried out for a circuit having three or more different levels of output voltage with an LSI tester, without changing its VOH (high test level) and VOL (low test level). SOLUTION: A parallel/series conversion means 3 receives signals, in parallel from a circuit block 1 through an input terminal 9 and outputs signals in series to an output terminal 11 through an input terminal 10. The parallel/series conversion means 3 has two different levels of output voltage, and a functional test for the circuit block 1 can be carried out without resetting an LSI tester for VOH and VOL. With this setup, a few functional tests that are carried out for a circuit block changing the setting of VOH and VOL of an LSI tester need not be carried out, and the testing time can be shortened.
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