JPS647557A - Vertically stacked read-only memory - Google Patents
Vertically stacked read-only memoryInfo
- Publication number
- JPS647557A JPS647557A JP16374987A JP16374987A JPS647557A JP S647557 A JPS647557 A JP S647557A JP 16374987 A JP16374987 A JP 16374987A JP 16374987 A JP16374987 A JP 16374987A JP S647557 A JPS647557 A JP S647557A
- Authority
- JP
- Japan
- Prior art keywords
- memory block
- digit line
- memory
- type
- transistors
- 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
- 230000007547 defect Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 230000006870 function Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
Landscapes
- Read Only Memory (AREA)
- Semiconductor Memories (AREA)
Abstract
PURPOSE:To reduce bit-related defects by a method wherein a memory block constituted of enhancement-type transistors is separated from a digit line. CONSTITUTION:When all cell transistors c1, c2...cn are of the enhancement type, a memory block selecting transistor 2 is changed from a depletion type to an enhancement type. This means that a second block selecting transistor 2 functions to electrically isolate a memory block from a digit line 20 when any of the transistors c1, c2...cn constituting the memory block is broken down. This stops a digit line from discharging, preventing trouble.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16374987A JPS647557A (en) | 1987-06-29 | 1987-06-29 | Vertically stacked read-only memory |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16374987A JPS647557A (en) | 1987-06-29 | 1987-06-29 | Vertically stacked read-only memory |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS647557A true JPS647557A (en) | 1989-01-11 |
Family
ID=15779964
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16374987A Pending JPS647557A (en) | 1987-06-29 | 1987-06-29 | Vertically stacked read-only memory |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS647557A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0498691A (en) * | 1990-08-16 | 1992-03-31 | Nec Ic Microcomput Syst Ltd | Semiconductor memory |
JPH06150691A (en) * | 1992-11-11 | 1994-05-31 | Yamaha Corp | Semiconductor memory |
US5581107A (en) * | 1993-03-17 | 1996-12-03 | Fujitsu Limited | Nonvolatile semiconductor memory that eases the dielectric strength requirements |
-
1987
- 1987-06-29 JP JP16374987A patent/JPS647557A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0498691A (en) * | 1990-08-16 | 1992-03-31 | Nec Ic Microcomput Syst Ltd | Semiconductor memory |
JPH06150691A (en) * | 1992-11-11 | 1994-05-31 | Yamaha Corp | Semiconductor memory |
US5581107A (en) * | 1993-03-17 | 1996-12-03 | Fujitsu Limited | Nonvolatile semiconductor memory that eases the dielectric strength requirements |
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