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
Magnetic recording medium, information storage device, and method of manufacturing magnetic recording medium
System and method for providing dynamic navigation through a property to a selected destination
Combination of a microorganism and a phytosphingosine derivative, composition, methods of use
Evaluating programmer efficiency in maintaining software systems
System for setting programmable parameters for an implantable hypertension treatment device
Sampling filter device
Antibody recognizing turn structure in amyloid .beta.
  Randomly Featured Patents
Interface detection device and detection method employing the same
Flexible leveling device
Liquid monopropellants containing dissolved combustion modifiers
Metal hanger ring
Toy puppet stage
Semiconductor device
Bending apparatus
Connector and connector device
Plush fragrancing system
Ball valve for use in heating or cooling systems