JPH0242154U - - Google Patents
Info
- Publication number
- JPH0242154U JPH0242154U JP11944888U JP11944888U JPH0242154U JP H0242154 U JPH0242154 U JP H0242154U JP 11944888 U JP11944888 U JP 11944888U JP 11944888 U JP11944888 U JP 11944888U JP H0242154 U JPH0242154 U JP H0242154U
- Authority
- JP
- Japan
- Prior art keywords
- backup battery
- semiconductor memory
- memory
- external device
- retains
- 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
- 238000001514 detection method Methods 0.000 claims description 2
- 239000004065 semiconductor Substances 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 1
Landscapes
- Credit Cards Or The Like (AREA)
- Power Sources (AREA)
Description
第１図は、本考案の第１の実施例を示す回路図
、第２図は本考案の第２の実施例を示す回路図、
第３図は従来のＩＣメモリカードを示す回路図で
ある。
２……ＲＡＭ、３，３′……接続部、４……電
源切換回路、１０，２０……ＩＣメモリカード、
１１……スイツチ、１２……電圧検知回路、１３
……比較器、１４……液晶表示器、３０……外部
装置。
FIG. 1 is a circuit diagram showing a first embodiment of the present invention, FIG. 2 is a circuit diagram showing a second embodiment of the present invention,
FIG. 3 is a circuit diagram showing a conventional IC memory card. 2...RAM, 3,3'...Connection part, 4...Power switching circuit, 10,20...IC memory card,
11...Switch, 12...Voltage detection circuit, 13
... Comparator, 14 ... Liquid crystal display, 30 ... External device.
Claims (1)
可能な半導体メモリと該半導体メモリの記憶内容
を保持させるバツクアツプ電池とを内蔵するＩＣ
メモリカードにおいて、 前記バツクアツプ電池の端子電圧を外部へ出力
できるようにしたことを特徴とするＩＣメモリカ
ード。 (2) 外部装置からのデータの書込み、読出しが
可能な半導体メモリと該半導体メモリの記憶内容
を保持させるバツクアツプ電池とを内蔵するＩＣ
メモリカードにおいて、 前記バツクアツプ電池の端子電圧の低下を検出
して表示する電圧検知回路を備えたことを特徴と
するＩＣメモリカード。[Claims for Utility Model Registration] (1) An IC that has a built-in semiconductor memory that can write and read data from an external device and a backup battery that retains the memory contents of the semiconductor memory.
An IC memory card characterized in that the terminal voltage of the backup battery can be outputted to the outside. (2) An IC that includes a semiconductor memory that can write and read data from an external device and a backup battery that retains the contents of the semiconductor memory.
An IC memory card comprising: a voltage detection circuit that detects and displays a drop in terminal voltage of the backup battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11944888U JPH0242154U (en) | 1988-09-12 | 1988-09-12 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11944888U JPH0242154U (en) | 1988-09-12 | 1988-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0242154U true JPH0242154U (en) | 1990-03-23 |
Family
ID=31364688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11944888U Pending JPH0242154U (en) | 1988-09-12 | 1988-09-12 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0242154U (en) |
-
1988
- 1988-09-12 JP JP11944888U patent/JPH0242154U/ja active Pending
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