Circuit for repairing defective bit in semiconductor memory devi

Details Circuit for repairing defective bit in semiconductor memory devi Circuit for repairing defective bit in semiconductor memory devi

1994-06-20

1995-11-28

Nelms, David C.

Static information storage and retrieval

Read/write circuit

Bad bit

3652257, G11C 700, G11C 2900

Patent

active

054714273

ABSTRACT:
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 nor 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.

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