JPS6427100A - Semiconductor memory device with redundant circuit - Google Patents
Semiconductor memory device with redundant circuitInfo
- Publication number
- JPS6427100A JPS6427100A JP62183967A JP18396787A JPS6427100A JP S6427100 A JPS6427100 A JP S6427100A JP 62183967 A JP62183967 A JP 62183967A JP 18396787 A JP18396787 A JP 18396787A JP S6427100 A JPS6427100 A JP S6427100A
- Authority
- JP
- Japan
- Prior art keywords
- wire
- goes
- wires
- circuit
- word
- 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
- Techniques For Improving Reliability Of Storages (AREA)
- For Increasing The Reliability Of Semiconductor Memories (AREA)
Abstract
PURPOSE:To decrease the number of spare code wires and to minimize the increment of a chip area with a redundant circuit by dividing a normal word wire into plural blocks and making spare word wires provided for respective blocks selectable. CONSTITUTION:In an address comparing circuit 20, when defective addresses and input addresses programmed at an (n) pieces of ROM 21 are all dissident, all defective address detecting signal wires 22 go to an L, and a spare word wire 70 does not rise. On the other hand, one selecting signal wire out of block selecting signal wires 50 goes to an H due to a normal predecoder 30, one out of block internal selecting signal wires 100 goes to the H, the output of a NAND circuit 90 goes to L, and one out of normal word wires 80 is driven by a driver 140. When one out of the defective addresses is coincident with the input address, a normal word wire prohibiting signal wire 110 goes to the H, all the wires 100 go to the L, the wire 80 goes to the L, a wire 22 connecting to said ROM 21 goes to the H, an OR circuit 120 and a space precode wire 40 go to the H, and the desired wire 70 is driven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62183967A JPS6427100A (en) | 1987-07-23 | 1987-07-23 | Semiconductor memory device with redundant circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62183967A JPS6427100A (en) | 1987-07-23 | 1987-07-23 | Semiconductor memory device with redundant circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6427100A true JPS6427100A (en) | 1989-01-30 |
Family
ID=16144956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62183967A Pending JPS6427100A (en) | 1987-07-23 | 1987-07-23 | Semiconductor memory device with redundant circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6427100A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08153399A (en) * | 1994-11-29 | 1996-06-11 | Nec Corp | Semiconductor memory |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63160095A (en) * | 1986-12-22 | 1988-07-02 | Mitsubishi Electric Corp | Semiconductor storage device |
-
1987
- 1987-07-23 JP JP62183967A patent/JPS6427100A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63160095A (en) * | 1986-12-22 | 1988-07-02 | Mitsubishi Electric Corp | Semiconductor storage device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08153399A (en) * | 1994-11-29 | 1996-06-11 | Nec Corp | Semiconductor memory |
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