JPS5590138A - Ic output latch circuit - Google Patents

Ic output latch circuit

Info

Publication number
JPS5590138A
JPS5590138A JP16105178A JP16105178A JPS5590138A JP S5590138 A JPS5590138 A JP S5590138A JP 16105178 A JP16105178 A JP 16105178A JP 16105178 A JP16105178 A JP 16105178A JP S5590138 A JPS5590138 A JP S5590138A
Authority
JP
Japan
Prior art keywords
transistor
power voltage
photocoupler
input terminal
constant
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
JP16105178A
Other languages
Japanese (ja)
Inventor
Yasumasa Takahashi
Shigenobu Iguchi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP16105178A priority Critical patent/JPS5590138A/en
Publication of JPS5590138A publication Critical patent/JPS5590138A/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

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

Abstract

PURPOSE:To hold the output state of IC constant by applying a constant clear level to the clear input terminal of IC when a power voltage is below a prescribed value. CONSTITUTION:As a power voltage increases gradually, transistor 9 conducts. As this point in time, Zener diode 7 and transistor 8 are both OFF. Consequently, a current flows through a light emitting diode in photocoupler 10 and a photo transistor in photocoupler 10 is turned ON. Emitter-collector voltage VCE with the photo transistor ON is applied to clear input termianl 4 of IC1. As a result, IC1 is forcibly reset and its output state is changed into a reset state. When the voltage increases high enough for IC1 to operate normally, the forcible resetting of IC1 is released and supplying a clock pulse to clock input terminal 3 starts normal operation. When the power voltage lowers, the circuit operation is reversed.
JP16105178A 1978-12-28 1978-12-28 Ic output latch circuit Pending JPS5590138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16105178A JPS5590138A (en) 1978-12-28 1978-12-28 Ic output latch circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16105178A JPS5590138A (en) 1978-12-28 1978-12-28 Ic output latch circuit

Publications (1)

Publication Number Publication Date
JPS5590138A true JPS5590138A (en) 1980-07-08

Family

ID=15727664

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16105178A Pending JPS5590138A (en) 1978-12-28 1978-12-28 Ic output latch circuit

Country Status (1)

Country Link
JP (1) JPS5590138A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082315U (en) * 1983-11-04 1985-06-07 三菱電機株式会社 Window comparator circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6082315U (en) * 1983-11-04 1985-06-07 三菱電機株式会社 Window comparator circuit
JPH0517665Y2 (en) * 1983-11-04 1993-05-12

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