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JPS54115749A - Source voltage monitor - Google Patents

Source voltage monitor

Info

Publication number
JPS54115749A
JPS54115749A JP2299878A JP2299878A JPS54115749A JP S54115749 A JPS54115749 A JP S54115749A JP 2299878 A JP2299878 A JP 2299878A JP 2299878 A JP2299878 A JP 2299878A JP S54115749 A JPS54115749 A JP S54115749A
Authority
JP
Japan
Prior art keywords
voltage
transistor
interruption
time
source 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.)
Granted
Application number
JP2299878A
Other languages
Japanese (ja)
Other versions
JPS6022568B2 (en
Inventor
Yoshitake Nagashima
Masaki Ota
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP53022998A priority Critical patent/JPS6022568B2/en
Publication of JPS54115749A publication Critical patent/JPS54115749A/en
Publication of JPS6022568B2 publication Critical patent/JPS6022568B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

PURPOSE:To complete the essential function of the system at any time by outputing the system enable signal when the source voltage exceeded over predetermined level after throwing-in while outputing the system disable signal before the source voltage drops below predetermined level after interruption. CONSTITUTION:At the initial stage of throwing-in of power source, transistor 18 is turned off while the transistor 24 is turned on and the system control sigal Sc from the terminal 25 is low. While when the voltage reaches to Zener voltage Vz of Zener diodes 13, 14, the transistor 21 turns on and Sc inverts to high level at the time point t1 time later than that where Vz starts to be constant. After interruption of power source Sc is inverted to low and after elapsing the time interval t2 Vz starts to drop. Consequently the system functions after the voltage reached to constant level and its function can be completed even if the system has started functioning after the power interruption.
JP53022998A 1978-03-01 1978-03-01 Power supply voltage monitoring circuit Expired JPS6022568B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53022998A JPS6022568B2 (en) 1978-03-01 1978-03-01 Power supply voltage monitoring circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53022998A JPS6022568B2 (en) 1978-03-01 1978-03-01 Power supply voltage monitoring circuit

Publications (2)

Publication Number Publication Date
JPS54115749A true JPS54115749A (en) 1979-09-08
JPS6022568B2 JPS6022568B2 (en) 1985-06-03

Family

ID=12098181

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53022998A Expired JPS6022568B2 (en) 1978-03-01 1978-03-01 Power supply voltage monitoring circuit

Country Status (1)

Country Link
JP (1) JPS6022568B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59165029U (en) * 1983-04-20 1984-11-06 日本ビクター株式会社 reset circuit
JPS60239815A (en) * 1984-05-14 1985-11-28 Matsushita Electric Ind Co Ltd Power supply failure signal output circuit of measuring instrument

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59165029U (en) * 1983-04-20 1984-11-06 日本ビクター株式会社 reset circuit
JPS60239815A (en) * 1984-05-14 1985-11-28 Matsushita Electric Ind Co Ltd Power supply failure signal output circuit of measuring instrument

Also Published As

Publication number Publication date
JPS6022568B2 (en) 1985-06-03

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