JPS6455017A - Protective circuit device for integrated circuit - Google Patents

Protective circuit device for integrated circuit

Info

Publication number
JPS6455017A
JPS6455017A JP62210578A JP21057887A JPS6455017A JP S6455017 A JPS6455017 A JP S6455017A JP 62210578 A JP62210578 A JP 62210578A JP 21057887 A JP21057887 A JP 21057887A JP S6455017 A JPS6455017 A JP S6455017A
Authority
JP
Japan
Prior art keywords
voltage
transistor
clamping
diode
terminal
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
JP62210578A
Other languages
Japanese (ja)
Inventor
Hiromi Miki
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP62210578A priority Critical patent/JPS6455017A/en
Publication of JPS6455017A publication Critical patent/JPS6455017A/en
Pending legal-status Critical Current

Links

Landscapes

  • Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
  • Thin Film Transistor (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To prevent an overcurrent from flowing to a MOS transistor by clamping a voltage between a power source terminal and a ground terminal at a predetermined value. CONSTITUTION:When an overvoltage is applied to a power source terminal, it is applied to a Zener diode 4 and a diode 5, a current flowing thereto flows to an N-P-N transistor 3 and a resistor 8, and the transistor 3 is turned ON. A potential between terminals 1 and 2 is clamped at a voltage between the base and the emitter of the transistor 3 and a Zener voltage and a breakdown voltage of a diode 5, and the overcurrent further becomes the collector current of the transistor 3 to flow to the terminal 2. This clamping voltage is necessarily set to between the normal using voltage and the breakdown voltage of MOS transistors 6, 7. In order to alter the clamping voltage, the number of the diodes 4, 5 inserted between the collector and the base of the transistor 3 is altered.
JP62210578A 1987-08-25 1987-08-25 Protective circuit device for integrated circuit Pending JPS6455017A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62210578A JPS6455017A (en) 1987-08-25 1987-08-25 Protective circuit device for integrated circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62210578A JPS6455017A (en) 1987-08-25 1987-08-25 Protective circuit device for integrated circuit

Publications (1)

Publication Number Publication Date
JPS6455017A true JPS6455017A (en) 1989-03-02

Family

ID=16591631

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62210578A Pending JPS6455017A (en) 1987-08-25 1987-08-25 Protective circuit device for integrated circuit

Country Status (1)

Country Link
JP (1) JPS6455017A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0294909A (en) * 1988-09-30 1990-04-05 Nec Corp Voltage clamping circuit
EP0492032A1 (en) * 1990-12-21 1992-07-01 STMicroelectronics S.r.l. Electrostatic discharge protection device for an integrated circuit pad and related integrated structure
US6262903B1 (en) 1998-12-24 2001-07-17 Denso Corporation Direct-current power supply circuit having control sections with at least one control section having priority over another control section

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0294909A (en) * 1988-09-30 1990-04-05 Nec Corp Voltage clamping circuit
EP0492032A1 (en) * 1990-12-21 1992-07-01 STMicroelectronics S.r.l. Electrostatic discharge protection device for an integrated circuit pad and related integrated structure
US5223737A (en) * 1990-12-21 1993-06-29 Sgs-Thomson Microelectronics S.R.L. Electrostatic discharge protection device for an integrated circuit pad and related integrated structure
US6262903B1 (en) 1998-12-24 2001-07-17 Denso Corporation Direct-current power supply circuit having control sections with at least one control section having priority over another control section

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