JPS57179998A - Memory device having redundancy - Google Patents
Memory device having redundancyInfo
- Publication number
- JPS57179998A JPS57179998A JP6300581A JP6300581A JPS57179998A JP S57179998 A JPS57179998 A JP S57179998A JP 6300581 A JP6300581 A JP 6300581A JP 6300581 A JP6300581 A JP 6300581A JP S57179998 A JPS57179998 A JP S57179998A
- Authority
- JP
- Japan
- Prior art keywords
- address
- memory cell
- circuit
- gate
- sense circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- For Increasing The Reliability Of Semiconductor Memories (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
- Read Only Memory (AREA)
Abstract
PURPOSE: To relieve defects with a simple redundant circuit, by providing one auxiliary memory cell to one defective bit of a main body memory cell, decoding the both at the same time and selecting output information through a gate.
CONSTITUTION: A row direction address signal AR is decoded at 11, a column address signal AC is also decoded at 12, a specified address of a main body memory cell group 13 is designated, storage information is accessed with a specified address and detected at a sense circuit 17. Further, row and column decoders 14 and 15 decode the address signals AR and AC when a defective bit of the group 13 is selected, the address is designated to an auxiliary memory cell group 16, the storage information is accessed from the specified address and detected at a sense circuit 18. The storage information of both the sense circuits 17 and 18 is given to a gate circuit 19, and when the cell group 13 is normal, the information in the sense circuit 17 is outputted and if failed, an AND gate 20 outputs a signal H and the sense circuit 18 is selected, allowing to relieve defects with a simple redundant circuit.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6300581A JPS57179998A (en) | 1981-04-25 | 1981-04-25 | Memory device having redundancy |
| US06/370,914 US4489402A (en) | 1981-04-25 | 1982-04-22 | Semiconductor memory device |
| DE19823215121 DE3215121A1 (en) | 1981-04-25 | 1982-04-23 | SEMICONDUCTOR STORAGE DEVICE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6300581A JPS57179998A (en) | 1981-04-25 | 1981-04-25 | Memory device having redundancy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57179998A true JPS57179998A (en) | 1982-11-05 |
Family
ID=13216765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6300581A Pending JPS57179998A (en) | 1981-04-25 | 1981-04-25 | Memory device having redundancy |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57179998A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6254900A (en) * | 1985-04-26 | 1987-03-10 | エステーミクロエレクトロニクス ソシエテ アノニム | Programmable read only memory |
| JPH01133298A (en) * | 1987-08-31 | 1989-05-25 | Hitachi Ltd | Semiconductor memory device |
| JPH01236499A (en) * | 1988-03-16 | 1989-09-21 | Hitachi Ltd | Semiconductor memory device |
| JPH01285098A (en) * | 1988-05-11 | 1989-11-16 | Nec Corp | Semiconductor memory device |
| JPH0221500A (en) * | 1988-07-08 | 1990-01-24 | Hitachi Ltd | Semiconductor memory with redundancy circuit for relieving defect |
| JPH0316099A (en) * | 1988-03-18 | 1991-01-24 | Toshiba Corp | Mask rom |
-
1981
- 1981-04-25 JP JP6300581A patent/JPS57179998A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6254900A (en) * | 1985-04-26 | 1987-03-10 | エステーミクロエレクトロニクス ソシエテ アノニム | Programmable read only memory |
| JPH01133298A (en) * | 1987-08-31 | 1989-05-25 | Hitachi Ltd | Semiconductor memory device |
| JPH01236499A (en) * | 1988-03-16 | 1989-09-21 | Hitachi Ltd | Semiconductor memory device |
| JPH0316099A (en) * | 1988-03-18 | 1991-01-24 | Toshiba Corp | Mask rom |
| JPH01285098A (en) * | 1988-05-11 | 1989-11-16 | Nec Corp | Semiconductor memory device |
| JPH0221500A (en) * | 1988-07-08 | 1990-01-24 | Hitachi Ltd | Semiconductor memory with redundancy circuit for relieving defect |
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