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JPS5518731A - Generating circuit for initial reset signal - Google Patents

Generating circuit for initial reset signal

Info

Publication number
JPS5518731A
JPS5518731A JP9047278A JP9047278A JPS5518731A JP S5518731 A JPS5518731 A JP S5518731A JP 9047278 A JP9047278 A JP 9047278A JP 9047278 A JP9047278 A JP 9047278A JP S5518731 A JPS5518731 A JP S5518731A
Authority
JP
Japan
Prior art keywords
trq
reset signal
voltage
initial reset
generating circuit
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
JP9047278A
Other languages
Japanese (ja)
Inventor
Hisamitsu Nitani
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 JP9047278A priority Critical patent/JPS5518731A/en
Publication of JPS5518731A publication Critical patent/JPS5518731A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To make it possible to generate automatically a reset signal by providing an initial reset signal generating circuit on an integrating circuit system with a method of discharging a capacitor when a direct-current voltage becomes below a normal value.
CONSTITUTION: When the power switch is closed and direct-current voltage Vcc exceeds the Zener voltage of Zener diode D2, transistors TrQ4 and TrQ3 turn ON and TrQ2 OFF to charge capacitor C1 by Vcc via resistance R2. When the charged voltage of C1 exceeds VBE of TrQ1 TrQ1 is ON and the collector voltage of TrQ1 is 0V. The electronic device applied with it is in an initial period corresponding to the OFF-state period of TrQ1. With the power switch OFF, Vcc falls down to less than the Zener voltage of D2 and then Trs Q4 and Q3 are OFF while TrQ2 is ON; and C1 is discharged rapidly and TrQ1 turns OFF as well, thereby generating an intial reset signal. Consequently, the power is truned On-OFf not by an operator and the initial reset signal is automatically generated.
COPYRIGHT: (C)1980,JPO&Japio
JP9047278A 1978-07-26 1978-07-26 Generating circuit for initial reset signal Pending JPS5518731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9047278A JPS5518731A (en) 1978-07-26 1978-07-26 Generating circuit for initial reset signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9047278A JPS5518731A (en) 1978-07-26 1978-07-26 Generating circuit for initial reset signal

Publications (1)

Publication Number Publication Date
JPS5518731A true JPS5518731A (en) 1980-02-09

Family

ID=13999526

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9047278A Pending JPS5518731A (en) 1978-07-26 1978-07-26 Generating circuit for initial reset signal

Country Status (1)

Country Link
JP (1) JPS5518731A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56139340U (en) * 1980-03-18 1981-10-21
JPS59119643U (en) * 1983-01-31 1984-08-13 日本電気ホームエレクトロニクス株式会社 Pulse generation circuit for initial setting
JPS6389147U (en) * 1986-11-27 1988-06-10

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56139340U (en) * 1980-03-18 1981-10-21
JPS59119643U (en) * 1983-01-31 1984-08-13 日本電気ホームエレクトロニクス株式会社 Pulse generation circuit for initial setting
JPS6389147U (en) * 1986-11-27 1988-06-10
JPH0534034Y2 (en) * 1986-11-27 1993-08-30

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