JPS5571000A - Memory unit - Google Patents

Memory unit

Info

Publication number
JPS5571000A
JPS5571000A JP14513778A JP14513778A JPS5571000A JP S5571000 A JPS5571000 A JP S5571000A JP 14513778 A JP14513778 A JP 14513778A JP 14513778 A JP14513778 A JP 14513778A JP S5571000 A JPS5571000 A JP S5571000A
Authority
JP
Japan
Prior art keywords
power supply
input terminal
circuit
voltage
switch
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
JP14513778A
Other languages
Japanese (ja)
Other versions
JPS5930287B2 (en
Inventor
Akihiro Akamatsu
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 JP53145137A priority Critical patent/JPS5930287B2/en
Publication of JPS5571000A publication Critical patent/JPS5571000A/en
Publication of JPS5930287B2 publication Critical patent/JPS5930287B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Power Sources (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Direct Current Feeding And Distribution (AREA)

Abstract

PURPOSE: To prevent the malfunction of control operation and error in analysis in advance, by providing the circuit comparing the cell voltage with the main power supply voltage and detecting the cell voltage at the application of the main power supply sufficient to back up.
CONSTITUTION: One input terminal of the comparison circuit 21 is connected to the plus power supply input terminal VDD of RAM1, and another input terminal is connected to the junction of the voltage division resistor 22 for voltage division connected between the plus output and ground of the main power supply. Further, the switch 23 is provided between the input terminal of the comparison circuit 21 and the power supply input terminal of RAM1 for switching possible, and the switch circuit 24 corresponding to the output of the comparison circuit 21 is provided at the prestage of the switching circuit 3. When the voltage of the cell 4 reaches sufficient value of memory back up, the output of the comparison circuit 21 closes the switch in the switch circuit 24 to connect the main power supply and the switch circuit 3. Thus, malfunction in the control operation and error in analysis can be prevented in advance.
COPYRIGHT: (C)1980,JPO&Japio
JP53145137A 1978-11-24 1978-11-24 Storage device Expired JPS5930287B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53145137A JPS5930287B2 (en) 1978-11-24 1978-11-24 Storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53145137A JPS5930287B2 (en) 1978-11-24 1978-11-24 Storage device

Publications (2)

Publication Number Publication Date
JPS5571000A true JPS5571000A (en) 1980-05-28
JPS5930287B2 JPS5930287B2 (en) 1984-07-26

Family

ID=15378259

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53145137A Expired JPS5930287B2 (en) 1978-11-24 1978-11-24 Storage device

Country Status (1)

Country Link
JP (1) JPS5930287B2 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58144533A (en) * 1982-02-22 1983-08-27 株式会社日立製作所 Battery backup power source
JPS59153109A (en) * 1983-02-22 1984-09-01 Mitsutoyo Mfg Co Ltd Erroneous-operation monitoring device for changed-amount measuring apparatus
JPS6048557A (en) * 1983-08-24 1985-03-16 Minolta Camera Co Ltd Memory control device
JPS61148554A (en) * 1984-12-22 1986-07-07 Tokyo Electric Co Ltd Memory device using c-mos
JPS61148553A (en) * 1984-12-22 1986-07-07 Tokyo Electric Co Ltd Memory device using c-mos
JPS62162751U (en) * 1986-04-04 1987-10-16
JPH0275510U (en) * 1988-11-28 1990-06-08
US5243577A (en) * 1989-12-11 1993-09-07 Sharp Kabushiki Kaisha Electronic apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58144533A (en) * 1982-02-22 1983-08-27 株式会社日立製作所 Battery backup power source
JPH027259B2 (en) * 1982-02-22 1990-02-16 Hitachi Ltd
JPS59153109A (en) * 1983-02-22 1984-09-01 Mitsutoyo Mfg Co Ltd Erroneous-operation monitoring device for changed-amount measuring apparatus
JPS6048557A (en) * 1983-08-24 1985-03-16 Minolta Camera Co Ltd Memory control device
JPS61148554A (en) * 1984-12-22 1986-07-07 Tokyo Electric Co Ltd Memory device using c-mos
JPS61148553A (en) * 1984-12-22 1986-07-07 Tokyo Electric Co Ltd Memory device using c-mos
JPH0436426B2 (en) * 1984-12-22 1992-06-16 Tokyo Electric Co Ltd
JPS62162751U (en) * 1986-04-04 1987-10-16
JPH0275510U (en) * 1988-11-28 1990-06-08
US5243577A (en) * 1989-12-11 1993-09-07 Sharp Kabushiki Kaisha Electronic apparatus

Also Published As

Publication number Publication date
JPS5930287B2 (en) 1984-07-26

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