JPS57115854A - Input protective circuit - Google Patents

Input protective circuit

Info

Publication number
JPS57115854A
JPS57115854A JP56001977A JP197781A JPS57115854A JP S57115854 A JPS57115854 A JP S57115854A JP 56001977 A JP56001977 A JP 56001977A JP 197781 A JP197781 A JP 197781A JP S57115854 A JPS57115854 A JP S57115854A
Authority
JP
Japan
Prior art keywords
diode
input
protective circuit
protective
resistor
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
JP56001977A
Other languages
Japanese (ja)
Inventor
Masayuki Kawasaki
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP56001977A priority Critical patent/JPS57115854A/en
Publication of JPS57115854A publication Critical patent/JPS57115854A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

PURPOSE:To prevent breakdown due to voltages and fields effectively, whenever either positive or negative excessive input signal is applied by a method wherein when a protective circuit of MOSFET IC is formed using a bipolar transistor, a resistor and a diode. CONSTITUTION:When an input protective circuit is provided between an internal circuit 13 of an IC composed of MOSFET and an input terminal 11, it is constructed of an NPN type bipolar transistor TR1, a protective resistor R2 and a diode D2. In this arrangement the terminal 11 is connected to the base and the collector of the transistor Tr1, the emitter is connected to a power source VDD, the protective resistor R2 is provided between the collector and the internal circuit 13, and to the line between them the grounded diode D2 is connected to form a branch. By this constitution when a positive excessive input is applied, an excessive current is exhausted into the power source VDD, and when a negative excessive input is applied, it is exhausted to the ground through the diode D2.
JP56001977A 1981-01-09 1981-01-09 Input protective circuit Pending JPS57115854A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56001977A JPS57115854A (en) 1981-01-09 1981-01-09 Input protective circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56001977A JPS57115854A (en) 1981-01-09 1981-01-09 Input protective circuit

Publications (1)

Publication Number Publication Date
JPS57115854A true JPS57115854A (en) 1982-07-19

Family

ID=11516594

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56001977A Pending JPS57115854A (en) 1981-01-09 1981-01-09 Input protective circuit

Country Status (1)

Country Link
JP (1) JPS57115854A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61198765A (en) * 1985-02-28 1986-09-03 Nippon Denso Co Ltd Semiconductor device
JPS62125659A (en) * 1985-11-26 1987-06-06 Toshiba Corp Input protecting circuit
JPS63313851A (en) * 1987-06-16 1988-12-21 Nec Corp Protective device for mos integrated circuit
JPH02132861A (en) * 1989-07-26 1990-05-22 Citizen Watch Co Ltd Protective circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61198765A (en) * 1985-02-28 1986-09-03 Nippon Denso Co Ltd Semiconductor device
JPS62125659A (en) * 1985-11-26 1987-06-06 Toshiba Corp Input protecting circuit
JPH0521344B2 (en) * 1985-11-26 1993-03-24 Tokyo Shibaura Electric Co
JPS63313851A (en) * 1987-06-16 1988-12-21 Nec Corp Protective device for mos integrated circuit
JPH02132861A (en) * 1989-07-26 1990-05-22 Citizen Watch Co Ltd Protective circuit
JPH0458190B2 (en) * 1989-07-26 1992-09-16 Citizen Watch Co Ltd

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