JPS56108120A - Automatic clearing circuit - Google Patents

Automatic clearing circuit

Info

Publication number
JPS56108120A
JPS56108120A JP1035780A JP1035780A JPS56108120A JP S56108120 A JPS56108120 A JP S56108120A JP 1035780 A JP1035780 A JP 1035780A JP 1035780 A JP1035780 A JP 1035780A JP S56108120 A JPS56108120 A JP S56108120A
Authority
JP
Japan
Prior art keywords
circuit
automatic clearing
voltage
ram
contents
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
JP1035780A
Other languages
Japanese (ja)
Inventor
Kenji Ichida
Masao Ariizumi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP1035780A priority Critical patent/JPS56108120A/en
Publication of JPS56108120A publication Critical patent/JPS56108120A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C5/00—Details of stores covered by group G11C11/00
    • G11C5/14—Power supply arrangements, e.g. power down, chip selection or deselection, layout of wirings or power grids, or multiple supply levels
    • G11C5/143—Detection of memory cassette insertion or removal; Continuity checks of supply or ground lines; Detection of supply variations, interruptions or levels ; Switching between alternative supplies

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Static Random-Access Memory (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To avoid the initial setting for the contents of a RAM by an automatic clearing circuit until the prescribed value is obtained and although the battery voltage reduces, by obtaining the output of the reference voltage generating circuit via a hysteresis circuit. CONSTITUTION:The output of the reference voltage generating circuit 3-1 is delivered via the hysteresis circuit 3-2 and the buffer 3-3. Even in case when the voltage of a battery reduces in the backup state mode due to the service interruption or other factors, the initial setting is never given to the contents of the RAM by the automatic clearing circuit until the voltage VA1.
JP1035780A 1980-01-31 1980-01-31 Automatic clearing circuit Pending JPS56108120A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1035780A JPS56108120A (en) 1980-01-31 1980-01-31 Automatic clearing circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1035780A JPS56108120A (en) 1980-01-31 1980-01-31 Automatic clearing circuit

Publications (1)

Publication Number Publication Date
JPS56108120A true JPS56108120A (en) 1981-08-27

Family

ID=11747913

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1035780A Pending JPS56108120A (en) 1980-01-31 1980-01-31 Automatic clearing circuit

Country Status (1)

Country Link
JP (1) JPS56108120A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58140649A (en) * 1982-02-16 1983-08-20 Fujitsu Ltd Voltage detecting circuit
EP0250242A2 (en) * 1986-06-20 1987-12-23 Fujitsu Limited Semiconductor memory device having erroneous write operation preventing circuit
JPH0284938U (en) * 1988-12-15 1990-07-03
JP2006005459A (en) * 2004-06-15 2006-01-05 Fujitsu Ltd Reset circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58140649A (en) * 1982-02-16 1983-08-20 Fujitsu Ltd Voltage detecting circuit
EP0250242A2 (en) * 1986-06-20 1987-12-23 Fujitsu Limited Semiconductor memory device having erroneous write operation preventing circuit
JPH0284938U (en) * 1988-12-15 1990-07-03
JP2006005459A (en) * 2004-06-15 2006-01-05 Fujitsu Ltd Reset circuit

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