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
Hair motion compositor system for use in a hair/fur pipeline
Herbicide composition having improved effectiveness, method of preparation and use
System for encrypting and decrypting a plaintext message with authentication
Firewall-tolerant voice-over-internet-protocol (VoIP) emulating SSL or HTTP sessions embedding voice data in cookies
Method and system for providing complete internet anywhere with partial server processing
Processing color and panchromatic pixels
System, method and computer program product for sharing a single instance of a database stored using a tenant of a multi-tenant on-demand database system
  Randomly Featured Patents
Expandable polystyrene particles
High electron mobility single heterojunction semiconductor devices and methods for production thereof
Minimizing the programming time in a semiconductor integrated memory circuit having an error correction function
High-speed serial linking device with de-emphasis function and the method thereof
Human galanin, CDNA clones encoding human galanin and a method of producing human galanin
Pressure control tracheal device
Adjustable gap capacitively coupled RF plasma reactor including lateral bellows and non-contact particle seal
Power supply adapter for portable electronic devices
Matriptase, a serine protease and its applications
Positive column gas discharge display