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
Process information structuring support method
Negative electrode material for non-aqueous electrolyte secondary battery, method for manufacturing negative electrode material for non-aqueous electrolyte secondary battery, non-aqueous elect
Micro positioning test socket and methods for active precision alignment and co-planarity feedback
Housing for gas flow indicator
High performance strained source-drain structure and method of fabricating the same
Method and apparatus for a cryptographically assisted commercial network system designed to facilitate buyer-driven conditional purchase offers
Voltage generating system and memory device using the same
  Randomly Featured Patents
Infrared detection sensor and method of fabricating the same
Housing for electronic lock
Golf ball locating system
Multi-view mirror assembly for a vehicle
Systems, methods, and apparatus for establishing payees based on cleared items posted to a financial account
Marine drive shift linkage
Synchronous motor torque control device
Handle for cleaner
Composite wiring structure having a wiring block and an insulating layer with electrical connections to probes