JPS57125522A - Power-on reset circuit - Google Patents

Power-on reset circuit

Info

Publication number
JPS57125522A
JPS57125522A JP1195081A JP1195081A JPS57125522A JP S57125522 A JPS57125522 A JP S57125522A JP 1195081 A JP1195081 A JP 1195081A JP 1195081 A JP1195081 A JP 1195081A JP S57125522 A JPS57125522 A JP S57125522A
Authority
JP
Japan
Prior art keywords
power
reset
capacitor
power supply
supply voltage
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
JP1195081A
Other languages
Japanese (ja)
Inventor
Shoji Kanamaru
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1195081A priority Critical patent/JPS57125522A/en
Publication of JPS57125522A publication Critical patent/JPS57125522A/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 increase the reliability of a microcomputer system, by enabling the drop of power supply voltage and power-on reset at restoration with a discharge circuit consisting of transistors (TRs). CONSTITUTION:When a power supply voltage drops to a value where no microprocessor 3 can normally operate, a Zener diode D2 which is normally conducted is interrupted, and a TR2 is similarly interrputed from conduction, the base potential of a TR3 is increased to be conductive, and the charge of a capacitor C1 is rapidly discharged. Thus, even if the voltae restores to a normal voltage from a temporary voltage drop, since the charging of the capacitor C1 starts from sufficiently discharged state, the time required for reset can be produced.
JP1195081A 1981-01-29 1981-01-29 Power-on reset circuit Pending JPS57125522A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1195081A JPS57125522A (en) 1981-01-29 1981-01-29 Power-on reset circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1195081A JPS57125522A (en) 1981-01-29 1981-01-29 Power-on reset circuit

Publications (1)

Publication Number Publication Date
JPS57125522A true JPS57125522A (en) 1982-08-04

Family

ID=11791908

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1195081A Pending JPS57125522A (en) 1981-01-29 1981-01-29 Power-on reset circuit

Country Status (1)

Country Link
JP (1) JPS57125522A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3332701A1 (en) * 1983-09-10 1985-03-28 kabelmetal electro GmbH, 3000 Hannover Circuit arrangement for an electrical device with microprocessor
US5394104A (en) * 1992-06-25 1995-02-28 Xilinx, Inc. Power-on reset circuit including dual sense amplifiers

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3332701A1 (en) * 1983-09-10 1985-03-28 kabelmetal electro GmbH, 3000 Hannover Circuit arrangement for an electrical device with microprocessor
US5394104A (en) * 1992-06-25 1995-02-28 Xilinx, Inc. Power-on reset circuit including dual sense amplifiers

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