Integrated circuit input-output diagnostic system

Details Integrated circuit input-output diagnostic system Integrated circuit input-output diagnostic system

1984-09-21

1987-01-20

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Plural, automatically sequential tests

371 21, G01R 1702

Patent

active

046382461

ABSTRACT:
Input and output fault monitoring circuits for determining the presence of integrated circuit chip open connections at the input and output pads of each circuit on a chip. The input fault monitoring circuit operates on the principle that if there is no input signal from the input pad throughout the known duty cycle or frequency of the input circuit, a defect, such as an open circuit interconnect, has occurred. The output fault monitoring circuit generates a signal through a dummy circuit connected to the output circuit which has a time delay intermediate that of the output circuit operating into a connected output pad and that of the output circuit when operating into a disconnected pad. Thus, the time of arrival of the dummy circuit signal in relation to that of the actual output signal is used to indicate the presence or absence of a disconnected output pad.

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