JPS54162577A - Low voltage detecting circuit - Google Patents

Low voltage detecting circuit

Info

Publication number
JPS54162577A
JPS54162577A JP7094678A JP7094678A JPS54162577A JP S54162577 A JPS54162577 A JP S54162577A JP 7094678 A JP7094678 A JP 7094678A JP 7094678 A JP7094678 A JP 7094678A JP S54162577 A JPS54162577 A JP S54162577A
Authority
JP
Japan
Prior art keywords
voltage
vth
time
detecting
low 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
JP7094678A
Other languages
Japanese (ja)
Inventor
Tetsuya Ando
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 JP7094678A priority Critical patent/JPS54162577A/en
Publication of JPS54162577A publication Critical patent/JPS54162577A/en
Pending legal-status Critical Current

Links

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

PURPOSE: To shorten the time required for maintenance of output voltage after cutting off of input and obtain a miniature and economical device by expediting the low voltage detecting time at the cutting off of input.
CONSTITUTION: The time constant at the charging of the capacitor 2 of an integrating circuit is made small by detecting that power source input voltage has become lower than the specified voltage level VTH2 lower than the voltage level which is instantaneously lowered by high frequency noise or the like and lower than normal voltage VTH1. Thereby the time when the detecting voltage lowers from VTH2 down to VTH1 may be shortened and the low voltage detecting time expedited.
COPYRIGHT: (C)1979,JPO&Japio
JP7094678A 1978-06-14 1978-06-14 Low voltage detecting circuit Pending JPS54162577A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7094678A JPS54162577A (en) 1978-06-14 1978-06-14 Low voltage detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7094678A JPS54162577A (en) 1978-06-14 1978-06-14 Low voltage detecting circuit

Publications (1)

Publication Number Publication Date
JPS54162577A true JPS54162577A (en) 1979-12-24

Family

ID=13446169

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7094678A Pending JPS54162577A (en) 1978-06-14 1978-06-14 Low voltage detecting circuit

Country Status (1)

Country Link
JP (1) JPS54162577A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523150U (en) * 1991-08-30 1993-03-26 ミツミ電機株式会社 Voltage detection circuit
US5943635A (en) * 1997-12-12 1999-08-24 Scenix Semiconductor Inc. System and method for programmable brown-out detection and differentiation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0523150U (en) * 1991-08-30 1993-03-26 ミツミ電機株式会社 Voltage detection circuit
US5943635A (en) * 1997-12-12 1999-08-24 Scenix Semiconductor Inc. System and method for programmable brown-out detection and differentiation

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