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

Image Number 2 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
Portion of display panel or screen with an icon
System for targeted delivery of therapeutic agents
Zero-copy network and file offload for web and application servers
Debugging using code analysis
Power supply system for a data storage system and a method of controlling a power supply
Method and apparatus for re-routing calls in a packet network during failures
Proximity sensor arrangement in a mobile device
  Randomly Featured Patents
Dun wing fly
Aromatic diamine derivative and organic electroluminescent device using the same
Phenoxyalkylcarboxylic acid compounds and thrombocyte-aggregation inhibition
Coordinate measuring machine with improved carriage drive system
Enhancement of dual transfer mode when circuit switched resources are released
Signal processing device, and signal processing method, and program, and recording medium
Whole-body antenna with microwave elements, and magnetic resonance system embodying same
Method of axially installing or removing a magnet-carrier assembly into or from a housing
Hollow needle tufting apparatus for producing patterned fabric
Furnace control method