JPH01142030U - - Google Patents
Info
- Publication number
- JPH01142030U JPH01142030U JP3885288U JP3885288U JPH01142030U JP H01142030 U JPH01142030 U JP H01142030U JP 3885288 U JP3885288 U JP 3885288U JP 3885288 U JP3885288 U JP 3885288U JP H01142030 U JPH01142030 U JP H01142030U
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- capacitor
- comparator
- self
- zener diode
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000005856 abnormality Effects 0.000 claims 2
- 230000002159 abnormal effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Power Sources (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Description
第１図は本考案の一実施例の回路図、第２図は
従来例の回路図である。
符号説明、１……定電圧回路、２……メモリ、
３……バツクアツプ・コンデンサ、４……ツエナ
・ダイオード、５，６……トランジスタ、７……
差動増幅器。
FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional example. Symbol explanation, 1...constant voltage circuit, 2...memory,
3... Backup capacitor, 4... Zener diode, 5, 6... Transistor, 7...
Differential amplifier.
Claims (1)
プされるときに、ツエナ・ダイオードと起動信号
によつてＯＮされる自己保持回路との直列接続さ
れたものが、前記コンデンサと並列に接続され、
前記ツエナ・ダイオードと前記自己保持回路との
接続点における電圧と、前記コンデンサのバツク
アツプ電圧に応じた電圧とがそれぞれ比較器に入
力され、この比較器の出力に基づいて前記バツク
アツプ電圧の異常降下を検知するようにしたこと
を特徴とするメモリ・バツクアツプ電圧の異常検
知装置。 When the memory is backed up by the voltage of the capacitor, a series connection of a Zener diode and a self-holding circuit that is turned on by a start signal is connected in parallel with the capacitor;
The voltage at the connection point between the Zener diode and the self-holding circuit and the voltage corresponding to the backup voltage of the capacitor are input to a comparator, and an abnormal drop in the backup voltage is detected based on the output of the comparator. A memory backup voltage abnormality detection device characterized by detecting an abnormality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3885288U JPH01142030U (en) | 1988-03-24 | 1988-03-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3885288U JPH01142030U (en) | 1988-03-24 | 1988-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01142030U true JPH01142030U (en) | 1989-09-28 |
Family
ID=31265389
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3885288U Pending JPH01142030U (en) | 1988-03-24 | 1988-03-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01142030U (en) |
-
1988
- 1988-03-24 JP JP3885288U patent/JPH01142030U/ja active Pending
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