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JPS5678227A - Reset pulse generating circuit - Google Patents

Reset pulse generating circuit

Info

Publication number
JPS5678227A
JPS5678227A JP15431879A JP15431879A JPS5678227A JP S5678227 A JPS5678227 A JP S5678227A JP 15431879 A JP15431879 A JP 15431879A JP 15431879 A JP15431879 A JP 15431879A JP S5678227 A JPS5678227 A JP S5678227A
Authority
JP
Japan
Prior art keywords
voltage
point
reset pulse
level
capacitor
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
JP15431879A
Other languages
Japanese (ja)
Inventor
Kazutoshi Kusano
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 Home Electronics Ltd
NEC Corp
Original Assignee
NEC Home Electronics Ltd
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 Home Electronics Ltd, Nippon Electric Co Ltd filed Critical NEC Home Electronics Ltd
Priority to JP15431879A priority Critical patent/JPS5678227A/en
Publication of JPS5678227A publication Critical patent/JPS5678227A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
    • H03K2017/226—Modifications for ensuring a predetermined initial state when the supply voltage has been applied in bipolar transistor switches

Landscapes

  • Electronic Switches (AREA)

Abstract

PURPOSE:To generate a reset pulse of high precision free from malfunction by generating an H-level voltage for a reset pulse not right after the electric power source is put to work but after the voltage rises up to a prescribed level. CONSTITUTION:The voltage from input terminal X at the applying time of electric power is branched at point A and applied to the emitter of pnp transistor TR5 and also to resistors 1 and 2. Further, it is branched at the other terminal D of resistor 1 and applied to capacitor 4 and Zener diode ZD1, which is grounded. Furthermore, connection point C of the other terminal of resistor 2 and capacitor 4 is connected to the base of TR5. When the voltage at point A rises above the Zener voltage of diode 3 after the electric power source is put to work, the voltage at point D is fixed at the voltage of diode 3 to turn on TR5, and then the voltage at point B is increased suddenly to output an H-level reset pulse, so that the voltage at point B will be held at level L by turning off TR5 when the charging of capacitor 4 ends.
JP15431879A 1979-11-30 1979-11-30 Reset pulse generating circuit Pending JPS5678227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15431879A JPS5678227A (en) 1979-11-30 1979-11-30 Reset pulse generating circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15431879A JPS5678227A (en) 1979-11-30 1979-11-30 Reset pulse generating circuit

Publications (1)

Publication Number Publication Date
JPS5678227A true JPS5678227A (en) 1981-06-27

Family

ID=15581498

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15431879A Pending JPS5678227A (en) 1979-11-30 1979-11-30 Reset pulse generating circuit

Country Status (1)

Country Link
JP (1) JPS5678227A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04128432U (en) * 1991-10-17 1992-11-24 沖電気工業株式会社 Power-on reset circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04128432U (en) * 1991-10-17 1992-11-24 沖電気工業株式会社 Power-on reset circuit

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