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
Porous polymeric resins
Luminescent substrate for liciferase
Method and device for processing broadcast packets/multicast control messages
Dynamic report mapping apparatus to physical data source when creating report definitions for information technology service management reporting for peruse of report definition transparency a
Micro vein enhancer
Bi-directional pattern dependent noise prediction
Partial response decision feedback equalizer with distributed control
  Randomly Featured Patents
Vanity case
Process for producing hollow bodies of thermoplastic material and apparatus for same
Inflator bag for occupant restraint device and method of manufacturing the inflator bag
Liquid crystal display panel and the control method thereof
Rope suspension arrangement
Imaging device
System and method for data recording
Gain and signal level adjustments of cascaded optical amplifiers
Method of weed control
Method of precisely adjusting the frequency of a piezoelectric resonator