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
Control device of hybrid vehicle
Low offset, fast response voltage controlled current source and controlling method thereof
Data scrambling in memory devices
Receiver and transmitter receiver system
Video surveillance system employing video primitives
Method and apparatus for cutting high quality internal features and contours
Message processing method and apparatus based on the SIP protocol and an IP communication system
  Randomly Featured Patents
Shimming method for NMR magnet having large magnetic field inhomogeneities
Rod locking device
Television receiver operating mode selector
Method for molding ophthalmic lenses
Method for producing cathode active material for lithium ion batteries, cathode active material for lithium ion batteries obtained by the production method, lithium ion battery electrode, and
Bundling fastener
Computer method and apparatus for determining site type of a web site
Handwriting sensing and analyzing apparatus
Process for tempering flavored confectionery compositions containing reduced calorie fats and resulting tempered products