JPS58101230U - Random access memory data protection circuit - Google Patents

Random access memory data protection circuit

Info

Publication number
JPS58101230U
JPS58101230U JP19536881U JP19536881U JPS58101230U JP S58101230 U JPS58101230 U JP S58101230U JP 19536881 U JP19536881 U JP 19536881U JP 19536881 U JP19536881 U JP 19536881U JP S58101230 U JPS58101230 U JP S58101230U
Authority
JP
Japan
Prior art keywords
random access
access memory
power source
protection circuit
data protection
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
JP19536881U
Other languages
Japanese (ja)
Other versions
JPS6225797Y2 (en
Inventor
芳博 松原
Original Assignee
日立電子株式会社
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 日立電子株式会社 filed Critical 日立電子株式会社
Priority to JP19536881U priority Critical patent/JPS58101230U/en
Publication of JPS58101230U publication Critical patent/JPS58101230U/en
Application granted granted Critical
Publication of JPS6225797Y2 publication Critical patent/JPS6225797Y2/ja
Granted legal-status Critical Current

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

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図及び第３図は、従来のＲＡＭのデータ保護回路の
一例の構成を示す図、第２図は、第１図の回路の１次電
源遮断の瞬間の各接続点の電位波形図、第４図は、本考
案の一実施例の構成を示す図である。 １・・・スピードアップコンデンサ、２．　３．　５゜
８．４０，４１．４２・・・抵抗、４・・・ダイオード
、６．７・・・トランジスタ、９・・・ＲＡＭ、　１０
．　１２・・・ダイオード、１１・・・２次電源。1 and 3 are diagrams showing the configuration of an example of a conventional RAM data protection circuit, and FIG. 2 is a potential waveform diagram of each connection point of the circuit shown in FIG. 1 at the moment when the primary power supply is cut off. FIG. 4 is a diagram showing the configuration of an embodiment of the present invention. 1...Speed-up capacitor, 2. 3. 5゜8.40, 41.42...Resistor, 4...Diode, 6.7...Transistor, 9...RAM, 10
．． 12...Diode, 11...Secondary power supply.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 商用電源から得た１次電源の遮断時には電池などの２次
電源により常に電力が供給され、記憶情報を保持するラ
ンダム・アクセス・メモリにおいて、前記１次電源接続
時には記憶情報の読出し、書込みを行うための制御信号
を与える回路の最終段を２段の反転器で構成し、前記１
次電源の立ち上がり、立ち下がり時に前記２段の反転器
のうち後段への入力レベルが前段への入力レベルより早
く低レベルになる特性を有するランダム・アクセス・メ
モリのデータ保護回路。When the primary power source obtained from a commercial power source is cut off, power is always supplied from a secondary power source such as a battery, and in a random access memory that retains stored information, when the primary power source is connected, stored information is read and written. The final stage of the circuit that provides the control signal for
A data protection circuit for a random access memory having a characteristic that the input level to the latter stage of the two-stage inverter becomes lower level earlier than the input level to the previous stage when the next power supply rises and falls.
JP19536881U 1981-12-26 1981-12-26 Random access memory data protection circuit Granted JPS58101230U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19536881U JPS58101230U (en) 1981-12-26 1981-12-26 Random access memory data protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19536881U JPS58101230U (en) 1981-12-26 1981-12-26 Random access memory data protection circuit

Publications (2)

Publication Number Publication Date
JPS58101230U true JPS58101230U (en) 1983-07-09
JPS6225797Y2 JPS6225797Y2 (en) 1987-07-01

Family

ID=30108646

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19536881U Granted JPS58101230U (en) 1981-12-26 1981-12-26 Random access memory data protection circuit

Country Status (1)

Country Link
JP (1) JPS58101230U (en)

Also Published As

Publication number Publication date
JPS6225797Y2 (en) 1987-07-01

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