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
Delay lines, amplifier systems, transconductance compensating systems and methods of compensating
Integrated emergency medical database system
Providing a feedback loop in a low latency serial interconnect architecture
Pandemic protocol for emergency dispatch
Minimizing mismatch during compensation
Tungsten barrier and seed for copper filled TSV
Brushless electric motor or generator in shell construction
  Randomly Featured Patents
MBE system with in-situ mounting
Proximity detection system and oscillator, and method of using same
Serving tray
Minimally invasive spinal distraction devices and methods
Method of joining plastic preforms to encapsulate an article
Detection of mutations in genes by specific LNA primers
Lactic acid bacteria, fermented seasoning liquid containing the same, and a method for producing bread
Control apparatus and method for internal combustion engine
Catalysts and processes for the polymerization of olefins
Garbage can cover retainer