JPH0270219U - - Google Patents
Info
- Publication number
- JPH0270219U JPH0270219U JP14825688U JP14825688U JPH0270219U JP H0270219 U JPH0270219 U JP H0270219U JP 14825688 U JP14825688 U JP 14825688U JP 14825688 U JP14825688 U JP 14825688U JP H0270219 U JPH0270219 U JP H0270219U
- Authority
- JP
- Japan
- Prior art keywords
- constant current
- circuit
- power supply
- voltage
- supply voltage
- 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 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
Landscapes
- Control Of Electrical Variables (AREA)
Description
第１図はこの考案の一実施例に係る半導体集積
回路における定電流回路の全体構成を示す回路図
、第２図は従来の定電流回路の構成例を示す回路
図である。
１０……電気回路、３０……トランジスタ（過
電圧用定電流トランジスタ）、３２……トランジ
スタ（減電圧用トランジスタ）、５０，５２，６
４……抵抗（電源電圧測定回路）、５６……コン
パレータ（電源電圧測定回路）。
FIG. 1 is a circuit diagram showing the overall configuration of a constant current circuit in a semiconductor integrated circuit according to an embodiment of this invention, and FIG. 2 is a circuit diagram showing an example of the configuration of a conventional constant current circuit. 10... Electric circuit, 30... Transistor (constant current transistor for overvoltage), 32... Transistor (transistor for reducing voltage), 50, 52, 6
4...Resistor (power supply voltage measurement circuit), 56...Comparator (power supply voltage measurement circuit).
Claims (1)
のものとするための半導体集積回路における定電
流回路において、 耐圧の比較的大きな過電圧用定電流トランジス
タと、 この過電圧用の定電流用トランジスタと並列接
続された耐圧の比較的小さな減電圧用定電流トラ
ンジスタと、 電源電圧測定回路と、 電源電圧を所定の設定値と比較し、設定値以上
であつた場合には上記過電圧用定電流トランジス
タをオンし、設定値以下であつた場合には上記減
電圧用の定電流トランジスタをオンするように制
御する制御回路と、 を有し、 定電流トランジスタを過電圧による破壊から保
護することを特徴とする半導体集積回路における
定電流回路。[Scope of Claim for Utility Model Registration] In a constant current circuit in a semiconductor integrated circuit for maintaining a predetermined current value in an electric circuit for performing various operations, a constant current transistor for overvoltage with a relatively large withstand voltage, and this overvoltage. A constant current transistor for reducing voltage with a relatively small withstand voltage connected in parallel with a constant current transistor for use with a power supply voltage measuring circuit, and a power supply voltage measuring circuit are used to compare the power supply voltage with a predetermined set value, and if the power supply voltage is higher than the set value, the a control circuit that turns on the constant current transistor for overvoltage and turns on the constant current transistor for reducing voltage when the voltage is below a set value; A constant current circuit in a semiconductor integrated circuit characterized by protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14825688U JPH0270219U (en) | 1988-11-14 | 1988-11-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14825688U JPH0270219U (en) | 1988-11-14 | 1988-11-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0270219U true JPH0270219U (en) | 1990-05-29 |
Family
ID=31419410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14825688U Pending JPH0270219U (en) | 1988-11-14 | 1988-11-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0270219U (en) |
-
1988
- 1988-11-14 JP JP14825688U patent/JPH0270219U/ja active Pending
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