JPS5577236A - Interface circuit of logic circuit - Google Patents

Interface circuit of logic circuit

Info

Publication number
JPS5577236A
JPS5577236A JP15180478A JP15180478A JPS5577236A JP S5577236 A JPS5577236 A JP S5577236A JP 15180478 A JP15180478 A JP 15180478A JP 15180478 A JP15180478 A JP 15180478A JP S5577236 A JPS5577236 A JP S5577236A
Authority
JP
Japan
Prior art keywords
circuit
photocoupler
constitution
contact
relay
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.)
Granted
Application number
JP15180478A
Other languages
Japanese (ja)
Other versions
JPS6357969B2 (en
Inventor
Susumu Enokido
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15180478A priority Critical patent/JPS5577236A/en
Publication of JPS5577236A publication Critical patent/JPS5577236A/en
Publication of JPS6357969B2 publication Critical patent/JPS6357969B2/ja
Granted 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
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/017509—Interface arrangements
    • H03K19/017536—Interface arrangements using opto-electronic devices

Abstract

PURPOSE:To simplify circuit constitution and also to improve performance by solving problems in terms of noise and level variation by using a photocoupler as a circuit which transmits logic information from an electromagnetic circuit to an electronic circuit. CONSTITUTION:Relay A operating when contact (b) forming a logic output is made is provided and to a connection point between relay A and contact (b), photocoupler PT where resistance R0, diode D and power supply E1 is so connected that mutually-opposite voltages will be applied to an input terminal with contact (b) made and broken respectively. To a transistor on the photo detection side of photocoupler PT, an integrating circuit composed of resistances R1 and R2, and capacitor C1 is connected and the output of this integrating circuit is supplied to the electronic circuit via a NAND circuit. The value of power supply E1 on the light emission side of photocoupler PT of this constitution is selected to prevent malfunction due to noise and the integral value of the reception side is set to prevent chattering and level variation.
JP15180478A 1978-12-06 1978-12-06 Interface circuit of logic circuit Granted JPS5577236A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15180478A JPS5577236A (en) 1978-12-06 1978-12-06 Interface circuit of logic circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15180478A JPS5577236A (en) 1978-12-06 1978-12-06 Interface circuit of logic circuit

Publications (2)

Publication Number Publication Date
JPS5577236A true JPS5577236A (en) 1980-06-10
JPS6357969B2 JPS6357969B2 (en) 1988-11-14

Family

ID=15526658

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15180478A Granted JPS5577236A (en) 1978-12-06 1978-12-06 Interface circuit of logic circuit

Country Status (1)

Country Link
JP (1) JPS5577236A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04290029A (en) * 1991-03-19 1992-10-14 Hitachi Ltd Switching state detector and controller and transmitter
JPH054634U (en) * 1991-06-27 1993-01-22 三菱重工業株式会社 Analog-digital conversion circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH059882Y2 (en) * 1988-09-29 1993-03-11

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4990063A (en) * 1972-12-07 1974-08-28
JPS512983A (en) * 1974-06-28 1976-01-12 Hitachi Ltd

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4990063A (en) * 1972-12-07 1974-08-28
JPS512983A (en) * 1974-06-28 1976-01-12 Hitachi Ltd

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04290029A (en) * 1991-03-19 1992-10-14 Hitachi Ltd Switching state detector and controller and transmitter
JPH054634U (en) * 1991-06-27 1993-01-22 三菱重工業株式会社 Analog-digital conversion circuit

Also Published As

Publication number Publication date
JPS6357969B2 (en) 1988-11-14

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