Patent ID: 6182255
Filing Date: 2001-01-30
Classification: G01R

Abstract:
An IC tester generating a test signal for testing devices under test and outputting the test signal to the devices under test so as to analyze conditions of output signals of the devices under test relative to the test signal, said IC tester including:comparator means for comparing the output signals of the devices under test with a plurality of given reference voltage values; anddecision means for receiving comparator output signals from the comparator means in a predetermined period of time, and for comparing the comparator output signals with logical value signals representing logical output signals of the devices under test relative to the test signal so as to decide whether the conditions of the output signals of the devices under test are equal to a logical value, wherein said decision means starts fetching of the comparator output signals in response to a first decision trigger signal which is generated at a given timing, and ends fetching of the comparator output signals in response to a second decision trigger signal which is generated upon elapse of a given time from the first decision trigger signal, thereby deciding the conditions of the output signals of the devices under test in a period of time between the first and second decision trigger signals.