JPS6237791A - Ic card - Google Patents

Ic card

Info

Publication number
JPS6237791A
JPS6237791A JP60177854A JP17785485A JPS6237791A JP S6237791 A JPS6237791 A JP S6237791A JP 60177854 A JP60177854 A JP 60177854A JP 17785485 A JP17785485 A JP 17785485A JP S6237791 A JPS6237791 A JP S6237791A
Authority
JP
Japan
Prior art keywords
lsi
terminal
terminals
card
rom
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
Application number
JP60177854A
Other languages
Japanese (ja)
Inventor
Yoshinori Okita
大喜多 義憲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP60177854A priority Critical patent/JPS6237791A/en
Publication of JPS6237791A publication Critical patent/JPS6237791A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To prevent completely the breakage of a LSI by connecting an earth terminal to another terminal via a Zener diode among plural terminals and avoiding such a case where an abnormal voltage produced by static electricity is applied to the LSI. CONSTITUTION:A LSI consisting of a CPU 5 and a ROM 6 built in an integrated circuit IC card 1 and plural terminals 2 connected to the LSI are exposed. A terminal 15 is connected to the CPU 5 and the ROM 6 as the earth among those terminals 8-15. While other terminals 8-14 are connected to the CPU 5 or the ROM 6. The CPU 5 is connected to the ROM 6 with an address/data bus 7. Then Zener diodes Z1-Z5 are connected among the earth terminal 15, terminals 8-10, 13 and 14 respectively. This avoids such a case where an abnormal voltage produced by static electricity is applied to the LSI. Thus the breakage of the LSI is completely prevented.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明はICカード、より詳しくは静電気によるLSI
の破壊を防止する対策を施したICカードに関する。
[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an IC card, more specifically an LSI using static electricity.
This invention relates to an IC card that has measures to prevent destruction of the IC card.

〈従来の技術〉 第3図はICカードの外観形状を示し、カード本体1の
表面に内部のLSI(図示せず)に接続した複数の端子
2が露出している。このICカードは、第4図に示すよ
うに、リーダ/ライタ3に挿入し、端末機4がらの操作
によりICカード1のデータの読み出しと書き込みが行
なわれる。
<Prior Art> FIG. 3 shows the external appearance of an IC card, in which a plurality of terminals 2 connected to an internal LSI (not shown) are exposed on the surface of the card body 1. As shown in FIG. 4, this IC card is inserted into a reader/writer 3, and data on the IC card 1 is read and written by operating the terminal 4.

〈発明が解決しようとする問題点〉 上述のように、ICカードは内蔵するLSIと接続した
端子が表面に露出している。このため、端子に指が触れ
て静電気が印加されると、LSIが破壊されるので、こ
の静電気によるLSIの破壊を防止する対策が必要にな
る。従来では、第5図に示すように、信号端子21の周
囲に接地端子22に接続した配線パターン23を形成す
ることにより、信号端子21へ静電気が印加されないよ
うにしていたが、この方法は必ずしも万全ではなかった
<Problems to be Solved by the Invention> As described above, the terminals connected to the built-in LSI of the IC card are exposed on the surface. For this reason, if a finger touches the terminal and static electricity is applied, the LSI will be destroyed, and therefore it is necessary to take measures to prevent the destruction of the LSI due to this static electricity. Conventionally, as shown in FIG. 5, a wiring pattern 23 connected to a ground terminal 22 is formed around the signal terminal 21 to prevent static electricity from being applied to the signal terminal 21. However, this method does not always work. It wasn't perfect.

〈問題点を解決する為の手段〉 LSIを内蔵しこのLSIと接続した複数の端子を表面
に形成したICカードにおいて、上記複数の端子の中の
接地端子と他の端子とをツェナーダイオードを介して接
続してなる。
<Means for solving the problem> In an IC card with a built-in LSI and a plurality of terminals connected to the LSI formed on the surface, the ground terminal and other terminals among the plurality of terminals are connected via a Zener diode. It is connected.

〈実施例〉 第1図はICカードの内部回路の構成を示す。<Example> FIG. 1 shows the configuration of the internal circuit of the IC card.

81固の端子8,9,10,11,12,13.14゜
15は10カードの表面に露出し、ICカードの内部で
端子8はROM6へ接続され、端子9,113.14.
15はCPU5へ接続され、端子915はさらにROM
6へ接続される。端子11゜12は、予備端子である。
Terminals 8, 9, 10, 11, 12, 13.14.
15 is connected to the CPU 5, and the terminal 915 is further connected to the ROM.
Connected to 6. Terminals 11 and 12 are spare terminals.

CPU5とROM6はともにLSIで形成され、これら
のLSIはICカードに内蔵される。上述の端子8.9
,10゜13.14.15は、このICカードをリーダ
/ライタ(図示せず)に挿入したとき、リーダ/ライタ
の所定の端子に接触する。リーダ/ライタから端子8に
はROM6の書き込み電圧Vpp、 a+9には電源電
圧Vccがそれぞれ供給される。端子10は、リーダ/
ライタとCPU5との間のデータ転送を行なうための端
子である。端子13にはリーダ/ライタからクロック信
号が供給され、端子14にはリセット信号が与えられる
。端子15は、リーダ/ライタの接地端子に接触する。
Both the CPU 5 and the ROM 6 are formed of LSIs, and these LSIs are built into the IC card. Terminal 8.9 mentioned above
, 10°13.14.15 come into contact with predetermined terminals of the reader/writer (not shown) when this IC card is inserted into the reader/writer (not shown). From the reader/writer, the write voltage Vpp of the ROM 6 is supplied to the terminal 8, and the power supply voltage Vcc is supplied to the terminal a+9. The terminal 10 is a reader/
This is a terminal for data transfer between the writer and the CPU 5. A clock signal is supplied to the terminal 13 from the reader/writer, and a reset signal is supplied to the terminal 14. Terminal 15 contacts the ground terminal of the reader/writer.

CPU5は、端子13を介して供給されるクロック信号
に同期して動作し、端子10を介して与えられるデータ
に応じてROM6のアドレスデータをアドレスバス及び
データバス7へ送出し、ROMOl 6からこのアドレ
スに固定記憶したデータをアドレスバス及びデータバス
7を介して取り込むとともに、このデータを端子10を
介してリーダ/う、  イタへ転送する。ROM6へデ
ータを書き込むときには、リーダ/ライタがら端子8を
介して得き込み電圧Vpp75<ROM6へ供給され、
さらに、端子10を介して与えられるデータがCPU5
.アドレスバス及びデータバス7を経てROM6へ害き
込まれる。
The CPU 5 operates in synchronization with the clock signal supplied via the terminal 13, and sends the address data of the ROM 6 to the address bus and data bus 7 in accordance with the data supplied via the terminal 10, and transfers the address data from the ROMOL 6 to the data bus 7. The data fixedly stored in the address is taken in via the address bus and the data bus 7, and this data is transferred to the reader/writer via the terminal 10. When writing data to the ROM6, the reader/writer supplies the acquired voltage Vpp75<ROM6 via the terminal 8,
Furthermore, the data given through the terminal 10 is sent to the CPU 5.
.. The data is written into the ROM 6 via the address bus and data bus 7.

5個ノツエナーダイオードZl、Z2.Z、3゜Z4.
Z5(7)7/−ドが端子14.13,10゜8.9に
それぞれ接続され、これらのツェナーダイオードZ1〜
Z5のカソードが接地端子15に接続される。ツェナー
ダイオ−+”zl、  22.  Z3、z5は、ツェ
ナー電圧が+5.6Vである。
5 pieces Ener diode Zl, Z2. Z, 3°Z4.
Z5(7)7/- are connected to terminals 14.13 and 10°8.9, respectively, and these Zener diodes Z1~
The cathode of Z5 is connected to ground terminal 15. Zener diodes +"zl, 22.Z3 and z5 have a Zener voltage of +5.6V.

また、ツェナーダイオードZ4ば、ツェナー電圧が+2
16Vである。一方、リーダ/ライタがら端子8に供給
される電圧は−0,6〜+21,6vであり、端子9,
10..13.14に供給される電圧は−0,6〜+5
.6vである。したがって、リーダ/ライタから供給さ
れる電圧の範囲では、ツェナーダイオード21〜Z5の
隆M現象は生しない。
Also, if the Zener diode Z4 has a Zener voltage of +2
It is 16V. On the other hand, the voltage supplied to the terminal 8 of the reader/writer is -0.6 to +21.6v, and the voltage supplied to the terminal 9,
10. .. The voltage supplied to 13.14 is -0,6 to +5
.. It is 6v. Therefore, within the voltage range supplied from the reader/writer, the bulge M phenomenon of the Zener diodes 21 to Z5 does not occur.

いま、何らかの原因で静電気による高電圧が端子8〜1
4に印加され、例えば端子1oに+5kVの静電気が印
加されると、ツェナーダイオードZ3により端子1oは
+5.6vにクランプされる。
Now, for some reason, high voltage due to static electricity is being applied to terminals 8 to 1.
For example, when +5 kV of static electricity is applied to the terminal 1o, the terminal 1o is clamped to +5.6V by the Zener diode Z3.

マタ、端子1oに一5kVの静電気が印加されると、ツ
ェナーダイオードZ3により端子1oは−0,6Vにク
ランプされる。他の端子8.9,13゜14についても
、同様にツェナーダイオ−)’Z 1゜Z2.Z4.Z
5により所定の低電圧にクランプされる。この結果、C
PU5及びROM6を形成するLSIには高電圧は印加
されず、LSIは静電気による破壊から保護される。
When static electricity of -5 kV is applied to the terminal 1o, the terminal 1o is clamped to -0.6V by the Zener diode Z3. Similarly, regarding the other terminals 8.9, 13°14, Zener diodes)'Z1°Z2. Z4. Z
5, it is clamped to a predetermined low voltage. As a result, C
No high voltage is applied to the LSI forming the PU 5 and the ROM 6, and the LSI is protected from destruction due to static electricity.

第2図は他の実施例を示し、ICカードのメモリとして
RAM16を用い、このRAM16にはバンクアンプ用
バッチ1月8と逆流防止用ダイオード17が接続される
。CPtJ5に接続された端子9.10,13.14と
接地端子15との間にツェナーダイオードZ6.Z7.
Z8.Z9がそれぞれ接続される。これらのツェナーダ
イオードZ6〜Z9のツェナー電圧は+5.6Vである
FIG. 2 shows another embodiment, in which a RAM 16 is used as the memory of the IC card, and a bank amplifier batch 8 and a backflow prevention diode 17 are connected to the RAM 16. A Zener diode Z6. Z7.
Z8. Z9 are connected respectively. The Zener voltage of these Zener diodes Z6 to Z9 is +5.6V.

したがって、端子9,10,13.14に何らかの原因
で高電圧の静電気が印加されても、端子9゜10.13
.14はツェナー電圧にクランプされ、CPU5及びR
AM16を形成するLSIは破壊から保護される。
Therefore, even if high voltage static electricity is applied to terminals 9, 10, 13.14 for some reason, terminals 9, 10, 13.
.. 14 is clamped to the Zener voltage, CPU5 and R
The LSI forming AM16 is protected from destruction.

〈効果〉 本発明においては、ICカードのLSIと接続した端子
と接地端子とをツェナーダイオードを介して接続したの
で、静電気による異常電圧がLSIに印加されることが
なく、LSIの静電気による破壊を確実に防止すること
ができる。
<Effects> In the present invention, since the terminal connected to the LSI of the IC card and the ground terminal are connected via the Zener diode, abnormal voltage due to static electricity is not applied to the LSI, and damage to the LSI due to static electricity is prevented. This can be reliably prevented.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図と第2図は本発明実施例の概略口i構成を示す図
、第3図はICカードの外観を示す斜視図、第4図Li
ICカードシステムの概略構成を示す斜視図、第5図は
従来例のICカードの部分構成を示す図である。 1−I Cカード    5−CP U6−ROM 8.9,10,11.12,13.14.15一端子 16−RA M
1 and 2 are diagrams showing a schematic configuration of an embodiment of the present invention, FIG. 3 is a perspective view showing the appearance of an IC card, and FIG.
FIG. 5 is a perspective view showing a schematic configuration of an IC card system, and FIG. 5 is a diagram showing a partial configuration of a conventional IC card. 1-I C card 5-CP U6-ROM 8.9, 10, 11.12, 13.14.15-terminal 16-RAM

Claims (1)

【特許請求の範囲】[Claims]  LSIを内蔵しこのLSIと接続した複数の端子を表
面に形成したICカードにおいて、上記複数の端子の中
の接地端子と他の端子とをツェナーダイオードを介して
接続してなることを特徴とするICカード。
An IC card with a built-in LSI and a plurality of terminals connected to the LSI formed on its surface, characterized in that a ground terminal and other terminals among the plurality of terminals are connected via a Zener diode. IC card.
JP60177854A 1985-08-12 1985-08-12 Ic card Pending JPS6237791A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60177854A JPS6237791A (en) 1985-08-12 1985-08-12 Ic card

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60177854A JPS6237791A (en) 1985-08-12 1985-08-12 Ic card

Publications (1)

Publication Number Publication Date
JPS6237791A true JPS6237791A (en) 1987-02-18

Family

ID=16038253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60177854A Pending JPS6237791A (en) 1985-08-12 1985-08-12 Ic card

Country Status (1)

Country Link
JP (1) JPS6237791A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62290588A (en) * 1986-06-11 1987-12-17 株式会社東芝 Portable memory medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62290588A (en) * 1986-06-11 1987-12-17 株式会社東芝 Portable memory medium
JPH06104394B2 (en) * 1986-06-11 1994-12-21 株式会社東芝 Portable storage media

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