Patent ID: 6327678
Filing Date: 2001-12-04
Classification: G01R

Abstract:
In an IC testing apparatus comprising a plurality of pin cards and at least one IC socket, each of said pin cards being provided with at least one driver for supplying a test pattern signal to an IC under test and comparator means for logically comparing a response output signal from the IC under test with a predetermined value, a method of adjusting a skew in each of said pin cards comprising the steps of:defining the comparator means provided in any one of said pin cards as reference detecting means;preparing a plurality of pseudo devices each of which electrically connects, when mounted on said IC socket, the pin card provided with said reference detecting means to at least one of the remaining pin cards through said IC socket; andsequentially mounting said plurality of pseudo devices on said IC socket to connect all of the remaining pin cards one after another to said reference detecting means, and adjusting the driving timing of the driver of each of the remaining pin cards to the detected timing of said reference detecting means.