JPS5680716A - Semiconductor memory device - Google Patents
Semiconductor memory deviceInfo
- Publication number
- JPS5680716A JPS5680716A JP15765679A JP15765679A JPS5680716A JP S5680716 A JPS5680716 A JP S5680716A JP 15765679 A JP15765679 A JP 15765679A JP 15765679 A JP15765679 A JP 15765679A JP S5680716 A JPS5680716 A JP S5680716A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- switch
- power source
- memory device
- charged
- 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
Abstract
PURPOSE: To freely control nonvolatile functions of a nonvolatile semiconductor memory device, by making it possible to control freely the charging operation and discharging operation of a chargeable battery.
CONSTITUTION: When main power source 2 is abnormal, information in a memory device is held by feeding electric power from battery 3. Then, when main power source 2 is put to work or recovers, battery 3 is charged. If the capacity of the battery is enough at this time, switch 8 is changed over to a trickle charge side to charge the battery so that its self-discharge is compensated. However, if the capacity of the battery is low, the battery can be charged in a short time by being charged rapidly with switch 8 placed at the side of resistance 7 and battery 3 can be held in readiness for the abnormal operation of main power source 2. With switch 8 at neither the trickle charge side nor the high-speed charge side, the discharge of the battery can be stopped only through the operation of switch 8. Thus, effective nonvolatile storage is provided even for a power source fault.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15765679A JPS5680716A (en) | 1979-12-04 | 1979-12-04 | Semiconductor memory device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15765679A JPS5680716A (en) | 1979-12-04 | 1979-12-04 | Semiconductor memory device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5680716A true JPS5680716A (en) | 1981-07-02 |
Family
ID=15654489
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15765679A Pending JPS5680716A (en) | 1979-12-04 | 1979-12-04 | Semiconductor memory device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5680716A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5960372A (en) * | 1982-09-30 | 1984-04-06 | Amano Corp | Battery monitoring system for backup power source of control system |
JP2009184680A (en) * | 2008-02-04 | 2009-08-20 | Yoshio Watanabe | Load distribution bag |
-
1979
- 1979-12-04 JP JP15765679A patent/JPS5680716A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5960372A (en) * | 1982-09-30 | 1984-04-06 | Amano Corp | Battery monitoring system for backup power source of control system |
JP2009184680A (en) * | 2008-02-04 | 2009-08-20 | Yoshio Watanabe | Load distribution bag |
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