Resources Contact Us Home
Circuit for repairing defective bit in semiconductor memory device and repairing method

Image Number 5 for United States Patent #5134585.

A circuit for repairing a defective memory cell is provided between a row or column decoder and a memory cell array. When the decoder has n output lines, the memory cell array includes at least (N+1) row or column lines, where n is an integer. The repair circuit includes connection circuit for connecting the output lines of the decoder to the row or column lines, and a circuit for defining the connection of the connection circuit. The connection circuit includes n switching elements each of which is operable to connect one output line of the decoder to at least two row or column lines. The defining circuit defines the connection path of each switching element such that the output lines of the decoder is connected in one to one correspondence to successively located row or column lines excluding a row or column line connecting a defective memory cell. The defining circuit includes a series of laser programmable fuse elements provided between an operation voltage supply and a ground line. The repair circuit occupies a reduced area of a chip because of no spare decoder and no program circuit and it carries out a reliable and fast memory repair because of the reduced number of the fuse elements to be blown off.

  Recently Added Patents
Storing records in databases in a randomized manner to effectively utilize database servers
Silicon wafer
Electronic device and method of associating a voice font with a contact for text-to-speech conversion at the electronic device
Compact latching mechanism for a mid-power electrical connector
Anti-reflection film and display device including the same, and manufacturing method of anti-reflection film and master film therefor
Method and product for manufacturing vulcanized footwear or cupsole footwear
Cap block for capping walls
  Randomly Featured Patents
Enzymatic coupling of L-phenylalanine methyl ester and N-benzyloxycarbonyl-aspartic acid
Method and system for recommending music
Headlight unit for single-track two-wheeled vehicles
Opaque films for use in packaging
System and method for aggulutination detection
Method for making N,N'-methylene bismaleimides and products made therefrom
Process for the production of coated or lacquered metal containers and the use thereof
Tooling to form pairs of dispenser pouches
Facilitation of hypervideo by automatic IR techniques in response to user requests
Non-marking collector apparatus and method