JPS54154365A - Power supply voltage detecting circuit - Google Patents
Power supply voltage detecting circuitInfo
- Publication number
- JPS54154365A JPS54154365A JP6271378A JP6271378A JPS54154365A JP S54154365 A JPS54154365 A JP S54154365A JP 6271378 A JP6271378 A JP 6271378A JP 6271378 A JP6271378 A JP 6271378A JP S54154365 A JPS54154365 A JP S54154365A
- Authority
- JP
- Japan
- Prior art keywords
- power supply
- supply voltage
- voltage detecting
- terminal
- detecting 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
Links
Abstract
PURPOSE: To eliminate unstability owing to variations of parts and make possible perfect circuit integration by comparing and detecting power supply voltages through plural voltage dividing circuits in electronic watches, etc.
CONSTITUTION: Outputs of power supply voltage dividing circuits A, C constituted by MOSFETs and resistances are compared in a voltage comparator B and the specified logic levels are outputted in terminal C according to the results of comparison. Here, if the supply voltage detecting value when the divided voltages Va and Vb inputted to FETs 7 and 9 respectively are equal is let to be Hj, then an H level is obtained in the terminal C when the power supply voltage VDD is larger than Ej and an L level when VDD<Vj. Hence, stable voltage detection may be accomplished.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6271378A JPS54154365A (en) | 1978-05-25 | 1978-05-25 | Power supply voltage detecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6271378A JPS54154365A (en) | 1978-05-25 | 1978-05-25 | Power supply voltage detecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54154365A true JPS54154365A (en) | 1979-12-05 |
Family
ID=13208237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6271378A Pending JPS54154365A (en) | 1978-05-25 | 1978-05-25 | Power supply voltage detecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54154365A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6134471A (en) * | 1984-07-26 | 1986-02-18 | Matsushita Electric Ind Co Ltd | Power source voltage detection circuit |
US5008566A (en) * | 1988-11-30 | 1991-04-16 | Nec Corporation | Power supply voltage drop detection circuit for use in EEPROM memory |
US5302861A (en) * | 1992-11-25 | 1994-04-12 | National Semiconductor Corporation | Power on reset circuit with sharply sloped voltage transfer function |
US5319255A (en) * | 1991-08-29 | 1994-06-07 | National Semiconductor Corporation | Power up detect circuit for configurable logic array |
US5378936A (en) * | 1991-12-19 | 1995-01-03 | Mitsubishi Denki Kabushiki Kaisha | Voltage level detecting circuit |
US5396115A (en) * | 1993-10-26 | 1995-03-07 | Texas Instruments Incorporated | Current-sensing power-on reset circuit for integrated circuits |
US5721502A (en) * | 1995-06-06 | 1998-02-24 | Analog Devices, Inc. | Voltage-controlled reset for logic state initialization |
CN100360945C (en) * | 2005-04-20 | 2008-01-09 | 威盛电子股份有限公司 | Electric voltage observation circuit |
JP2014225739A (en) * | 2013-05-15 | 2014-12-04 | 株式会社デンソー | Voltage determination device |
-
1978
- 1978-05-25 JP JP6271378A patent/JPS54154365A/en active Pending
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6134471A (en) * | 1984-07-26 | 1986-02-18 | Matsushita Electric Ind Co Ltd | Power source voltage detection circuit |
US5008566A (en) * | 1988-11-30 | 1991-04-16 | Nec Corporation | Power supply voltage drop detection circuit for use in EEPROM memory |
US5319255A (en) * | 1991-08-29 | 1994-06-07 | National Semiconductor Corporation | Power up detect circuit for configurable logic array |
US5378936A (en) * | 1991-12-19 | 1995-01-03 | Mitsubishi Denki Kabushiki Kaisha | Voltage level detecting circuit |
US5302861A (en) * | 1992-11-25 | 1994-04-12 | National Semiconductor Corporation | Power on reset circuit with sharply sloped voltage transfer function |
US5396115A (en) * | 1993-10-26 | 1995-03-07 | Texas Instruments Incorporated | Current-sensing power-on reset circuit for integrated circuits |
US5721502A (en) * | 1995-06-06 | 1998-02-24 | Analog Devices, Inc. | Voltage-controlled reset for logic state initialization |
CN100360945C (en) * | 2005-04-20 | 2008-01-09 | 威盛电子股份有限公司 | Electric voltage observation circuit |
JP2014225739A (en) * | 2013-05-15 | 2014-12-04 | 株式会社デンソー | Voltage determination device |
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