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
Bandpass filter and radio communication module and radio communication device using the same
Organic light emitting diode device and fabrication method thereof
PC secure video path
Apparatus and method for storing event information for an HVAC system
Simplifying lexicon creation in hybrid duplicate detection and inductive classifier systems
Multi-radio coexistence
Electronic device and printed circuit board
  Randomly Featured Patents
Radiotherapy apparatus and parts thereof
Method of patterning a FeRAM capacitor with a sidewall during bottom electrode etch
Liquid jetting apparatus
Method for more efficient service request processing
Method and apparatus for interconnection of personal area networks (PANs)
Pivoting shoulder strap for a backpack
Laser indicator for remote measuring devices and methods therefor
Multiple ply wood article and method
Preparation method of 3-nitro-1,2,4-triazol-5-one by a process minimizing heat generation during crystallization
Portable automotive test probe