JPS57123739A - Voltage level converting circuit - Google Patents

Voltage level converting circuit

Info

Publication number
JPS57123739A
JPS57123739A JP56008957A JP895781A JPS57123739A JP S57123739 A JPS57123739 A JP S57123739A JP 56008957 A JP56008957 A JP 56008957A JP 895781 A JP895781 A JP 895781A JP S57123739 A JPS57123739 A JP S57123739A
Authority
JP
Japan
Prior art keywords
power source
switch
circuit
converting circuit
level converting
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
JP56008957A
Other languages
Japanese (ja)
Inventor
Satokazu Saito
Hideyuki Nakai
Seiichi Takagi
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.)
Oki Electric Industry Co Ltd
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
Oki Electric Industry 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 Nippon Telegraph and Telephone Corp, Oki Electric Industry Co Ltd filed Critical Nippon Telegraph and Telephone Corp
Priority to JP56008957A priority Critical patent/JPS57123739A/en
Publication of JPS57123739A publication Critical patent/JPS57123739A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/007—Fail-safe circuits

Landscapes

  • Logic Circuits (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To apply a ground potential to an SR line even when the secondary- side output voltage of a power device is cut off, by using a negative power source for the input side of the power source as that for a bias circuit in an SR level converting circuit which uses a transistor (TR) switch. CONSTITUTION:If the secondary-side output voltage of a power source 3 is cut off accidentally, a logical-level SR signal 2 outputted from a logical circuit 1 is ceased. Since a resistance dividing circuit 5 for bias supply is connected to the input-side negative power source -48V of the power source 3, the base voltage of a TR switch 6 drops below its emitter potential, so the TR switch 6 turns on to apply a ground potential to an SR signal transmitting terminal 7.
JP56008957A 1981-01-26 1981-01-26 Voltage level converting circuit Pending JPS57123739A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56008957A JPS57123739A (en) 1981-01-26 1981-01-26 Voltage level converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56008957A JPS57123739A (en) 1981-01-26 1981-01-26 Voltage level converting circuit

Publications (1)

Publication Number Publication Date
JPS57123739A true JPS57123739A (en) 1982-08-02

Family

ID=11707145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56008957A Pending JPS57123739A (en) 1981-01-26 1981-01-26 Voltage level converting circuit

Country Status (1)

Country Link
JP (1) JPS57123739A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100408003B1 (en) * 2001-12-29 2003-12-01 엘지.필립스 엘시디 주식회사 Protection circuit for Liquid crystal display device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337549U (en) * 1976-09-07 1978-04-01
JPS5444192A (en) * 1977-09-13 1979-04-07 Toshiba Corp Control red driving system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5337549U (en) * 1976-09-07 1978-04-01
JPS5444192A (en) * 1977-09-13 1979-04-07 Toshiba Corp Control red driving system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100408003B1 (en) * 2001-12-29 2003-12-01 엘지.필립스 엘시디 주식회사 Protection circuit for Liquid crystal display device

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