JPS57100520A - Memory power supply circuit - Google Patents

Memory power supply circuit

Info

Publication number
JPS57100520A
JPS57100520A JP55175827A JP17582780A JPS57100520A JP S57100520 A JPS57100520 A JP S57100520A JP 55175827 A JP55175827 A JP 55175827A JP 17582780 A JP17582780 A JP 17582780A JP S57100520 A JPS57100520 A JP S57100520A
Authority
JP
Japan
Prior art keywords
power supply
memory
turned
drop
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
JP55175827A
Other languages
Japanese (ja)
Other versions
JPS6321937B2 (en
Inventor
Takashi Abe
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 JP55175827A priority Critical patent/JPS57100520A/en
Publication of JPS57100520A publication Critical patent/JPS57100520A/en
Publication of JPS6321937B2 publication Critical patent/JPS6321937B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Power Sources (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Stand-By Power Supply Arrangements (AREA)

Abstract

PURPOSE:To realize a high speed for memory access and to allow the drop of the power supply voltage down to the limit of the assured value of the memory working voltage, by receiving the output of a fault detecting circuit for power supply and controlling a memory chip selection terminal with the received output mentioned above. CONSTITUTION:When a fault detecting circuit 8 for power supply detects the voltage drop or cutoff of an ordinary power supply 2, a trnsistor TR9 is turned off by a power supply fault detection signal 6. In this case, an auxiliary power supply 3 already supplied the electric power to a memory 1. A selection signal 7 which is delivered from a TTLIC4' in accordance with a chip selection signal 5 is turned off by a pull-down resistance 10 and when the TR9 is turned off. As a result, the memory access is accelerated and the drop is allowed for the power supply voltage down to the limit of the assured value of the memory working voltage. Such power supply device is obtained.
JP55175827A 1980-12-15 1980-12-15 Memory power supply circuit Granted JPS57100520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55175827A JPS57100520A (en) 1980-12-15 1980-12-15 Memory power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55175827A JPS57100520A (en) 1980-12-15 1980-12-15 Memory power supply circuit

Publications (2)

Publication Number Publication Date
JPS57100520A true JPS57100520A (en) 1982-06-22
JPS6321937B2 JPS6321937B2 (en) 1988-05-10

Family

ID=16002908

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55175827A Granted JPS57100520A (en) 1980-12-15 1980-12-15 Memory power supply circuit

Country Status (1)

Country Link
JP (1) JPS57100520A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62154571U (en) * 1986-03-19 1987-10-01
JPH03286215A (en) * 1990-03-30 1991-12-17 Mitsumi Electric Co Ltd Memory backup circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62154571U (en) * 1986-03-19 1987-10-01
JPH03286215A (en) * 1990-03-30 1991-12-17 Mitsumi Electric Co Ltd Memory backup circuit

Also Published As

Publication number Publication date
JPS6321937B2 (en) 1988-05-10

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