The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 29, 1986
Filed:
Apr. 16, 1984
James E O'Toole, Carrollton, TX (US);
Robert J Proebsting, Carrollton, TX (US);
Thomson Components-Mostek Corporation, Carrollton, TX (US);
Abstract
A test circuit (10) for a semiconductor memory is provided. The semiconductor memory includes a redundant decoder (70) for receiving memory address signals (66, 68) which is connected to a redundant circuit element via a signal line (72). The redundant decoder (70) can be programmed in accordance with the address of a defective circuit element, such that when the decoder (70) is addressed by the memory address signals (66, 68) the decoder (70) selects a predetermined redundant circuit element. The test circuit (10) generates an output signal (14) indicating that the circuit element selected by the decoder (70) is a redundant circuit element. The output signal (14) is applied to an indicator circuit (16) which is enabled in a test mode by an abnormal condition detector (26). The output (18) of indicator circuit (16) is applied to an external pin (20).