JPS57138098A - Mis-write preventing circuit in main power supply failure - Google Patents
Mis-write preventing circuit in main power supply failureInfo
- Publication number
- JPS57138098A JPS57138098A JP56022267A JP2226781A JPS57138098A JP S57138098 A JPS57138098 A JP S57138098A JP 56022267 A JP56022267 A JP 56022267A JP 2226781 A JP2226781 A JP 2226781A JP S57138098 A JPS57138098 A JP S57138098A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- main power
- mis
- memory
- supply voltage
- 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
- 230000037138 Vds Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
Abstract
PURPOSE:To surely perform prevention of mis-write at main power supply failure, by inhibiting a memory driving signal quickly when the main power supply falls. CONSTITUTION:When a main power supply 8 falls and a main power supply voltage VCC is a preset value or less, a main power supply voltage failure detecting signal VDS is outputted from a main power supply voltage failure detecting circuit 1, a switch circuit 5 is opened and the power supply for the final stage gate 3 of a memory drive circuit 2 is interrupted. Thus, the gate 3 performs no function and the memory drive signal MCS is kept at high level and inhibited with pull-up of a battery voltage VBB. Thereafter, when the main power supply voltage lowers, even if a mis-output is outputted from the circuit 2, since the final stage gate does not perform the function, the effect is not given on a memory cell 4. Thus, mis-write to the memory can be prevented.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56022267A JPS57138098A (en) | 1981-02-19 | 1981-02-19 | Mis-write preventing circuit in main power supply failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56022267A JPS57138098A (en) | 1981-02-19 | 1981-02-19 | Mis-write preventing circuit in main power supply failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57138098A true JPS57138098A (en) | 1982-08-26 |
Family
ID=12077989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56022267A Pending JPS57138098A (en) | 1981-02-19 | 1981-02-19 | Mis-write preventing circuit in main power supply failure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57138098A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6227253A (en) * | 1985-07-27 | 1987-02-05 | Ricoh Co Ltd | Cut sheet recording device |
| JPS63103128U (en) * | 1986-12-22 | 1988-07-04 | ||
| JP2012103996A (en) * | 2010-11-12 | 2012-05-31 | Nippon Signal Co Ltd:The | Writing control apparatus |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51117836A (en) * | 1975-04-10 | 1976-10-16 | Toshiba Corp | Memory drive circuit |
| JPS54125932A (en) * | 1978-03-23 | 1979-09-29 | Matsushita Electric Ind Co Ltd | Protective device for memory unit |
-
1981
- 1981-02-19 JP JP56022267A patent/JPS57138098A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51117836A (en) * | 1975-04-10 | 1976-10-16 | Toshiba Corp | Memory drive circuit |
| JPS54125932A (en) * | 1978-03-23 | 1979-09-29 | Matsushita Electric Ind Co Ltd | Protective device for memory unit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6227253A (en) * | 1985-07-27 | 1987-02-05 | Ricoh Co Ltd | Cut sheet recording device |
| JPS63103128U (en) * | 1986-12-22 | 1988-07-04 | ||
| JPH057633Y2 (en) * | 1986-12-22 | 1993-02-25 | ||
| JP2012103996A (en) * | 2010-11-12 | 2012-05-31 | Nippon Signal Co Ltd:The | Writing control apparatus |
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