Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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
Ultrasonic device for cutting and coagulating with stepped output
Disposable fluid dispenser
Delegation based mobility management
Device, method and computer program product for generating web feeds
Server
Graphic query suggestion display method
Misting fan with flared bottle
  Randomly Featured Patents
Circuit apparatus with a high-side buck transistor
Modified molecular sieve characterized by improved sodium-contamination-resisting activity and preparation method thereof
Plasticizable implant material and method for producing the same
Single piece closure device made of PVC
Control apparatus for automobile air-conditioners
Nut cracker design
Controller with adjustable proportionality range
Electronic postage scale
Method and apparatus for improving the permeability in an earth formation utilizing shock waves
Active restore weak write test mode