JPH0227220U - - Google Patents
Info
- Publication number
- JPH0227220U JPH0227220U JP10430488U JP10430488U JPH0227220U JP H0227220 U JPH0227220 U JP H0227220U JP 10430488 U JP10430488 U JP 10430488U JP 10430488 U JP10430488 U JP 10430488U JP H0227220 U JPH0227220 U JP H0227220U
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- card
- control circuit
- supply voltage
- voltage control
- 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
- 239000004065 semiconductor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Power Sources (AREA)
- Static Random-Access Memory (AREA)
Description
第１図はこの考案の一実施例によるＩＣカード
の揮発性メモリの電源電圧制御回路の回路図、第
２図は従来のＩＣカードの揮発性メモリの電源電
圧制御回路の回路図である。
図中、１はツエナーダイオード、２，４，６，
１２は抵抗、３はＮＰＮトランジスタ、５はＯＲ
ゲート、７，８，９，１１はダイオード、１０は
ＰＮＰトランジスタ、１３は電池、１４は揮発性
メモリ、１５は一次電源線、１６はパワーダウン
入力信号、１７は二次電源線である。なお、図中
同一符号は同一又は相当部分を示す。
FIG. 1 is a circuit diagram of a power supply voltage control circuit for a volatile memory of an IC card according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional power supply voltage control circuit for a volatile memory of an IC card. In the figure, 1 is a Zener diode, 2, 4, 6,
12 is a resistor, 3 is an NPN transistor, 5 is an OR
10 is a PNP transistor, 13 is a battery, 14 is a volatile memory, 15 is a primary power line, 16 is a power down input signal, and 17 is a secondary power line. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (1)
、上記素子の電源端子は外部またはカード内部で
作られた制御信号入力によりステツプダウン可能
な電源電圧制御回路を介して接続されていること
を特徴とするＩＣカード。 An IC card having a built-in semiconductor memory element, characterized in that the power supply terminal of the element is connected via a power supply voltage control circuit that can be stepped down by inputting a control signal generated externally or inside the card. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10430488U JPH0227220U (en) | 1988-08-06 | 1988-08-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10430488U JPH0227220U (en) | 1988-08-06 | 1988-08-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0227220U true JPH0227220U (en) | 1990-02-22 |
Family
ID=31335902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10430488U Pending JPH0227220U (en) | 1988-08-06 | 1988-08-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0227220U (en) |
-
1988
- 1988-08-06 JP JP10430488U patent/JPH0227220U/ja active Pending
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