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
Controller with screen
Therapeutic rinse in a self-heating package
Automated solar collector installation design including ability to define heterogeneous design preferences
High-density 3-dimensional structure
Provision of downlink packet access services to user equipment in spread spectrum communication network
TRPM8 antagonists and their use in treatments
Spray drying vancomycin
  Randomly Featured Patents
Poly(arylene sulfide) containing talc
Adjustable cosmetic applicator with universal joint
Method for producing improved sensor
Myoglobin blooming agent containing shrink films, packages and methods for packaging
Automotive polarizer screen shade
Axial gap electrical machine
Apparatus and method for high-level synthesis of a logic circuit
Method and apparatus for optimizing pacemaker AV delay
Apex seal with filled aperture
Iris imaging telephone security module and method