JPS62175330U - - Google Patents

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Publication number
JPS62175330U
JPS62175330U JP6046686U JP6046686U JPS62175330U JP S62175330 U JPS62175330 U JP S62175330U JP 6046686 U JP6046686 U JP 6046686U JP 6046686 U JP6046686 U JP 6046686U JP S62175330 U JPS62175330 U JP S62175330U
Authority
JP
Japan
Prior art keywords
power supply
supply voltage
voltage
ram
monitoring
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
JP6046686U
Other languages
Japanese (ja)
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 filed Critical
Priority to JP6046686U priority Critical patent/JPS62175330U/ja
Publication of JPS62175330U publication Critical patent/JPS62175330U/ja
Pending legal-status Critical Current

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Description

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

第１図は本考案の１実施例を示した回路図、第
２図は従来例回路図、第３図は従来例出力部の内
部回路図である。 １は電源電圧監視用ＩＣ、２はシステムの電源
（電源を遮断するとＯＶまで落ちる）、３は監視
ＩＣの出力部トランジスターのベース端子、４は
監視用ＩＣの出力部トランジスターのコレクタ端
子（オープンコレクタ形出力）、５はＲＡＭのチ
ツプセレクト信号入力、６はスタテイツクＲＡＭ
（ランダムアクセスメモリー）、７はバツテリー
電源（通常３．４Ｖ以上）である。またＲ４はプ
ルアツプ抵抗、Ｒ５及びＲ６はシステム電源分圧
抵抗である。 FIG. 1 is a circuit diagram showing one embodiment of the present invention, FIG. 2 is a conventional circuit diagram, and FIG. 3 is an internal circuit diagram of a conventional output section. 1 is the power supply voltage monitoring IC, 2 is the system power supply (it drops to OV when the power is cut off), 3 is the base terminal of the output transistor of the monitoring IC, and 4 is the collector terminal of the output transistor of the monitoring IC (open collector). 5 is RAM chip select signal input, 6 is static RAM
(random access memory), 7 is a battery power supply (usually 3.4V or more). Further, R4 is a pull-up resistor, and R5 and R6 are system power supply voltage dividing resistors.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 電源電圧監視用ＩＣとスタテイツク型ＲＡＭと
の組合わせにおいて、該ＩＣのオープニングコレ
クタ出力端子と該ＲＡＭのチツプセレクト信号入
力端子との間に介挿される、該ＩＣとの共通電源
と接地間に２つの抵抗を含んだ分圧回路からなり
、共通電源電圧が該ＩＣの最低動作電圧以下にな
つたとき、分圧回路の出力電圧がデイスエーブル
ないしＬラベルとして該ＲＡＭのチツプセレクト
信号入力端子に入力されることを特徴とする、電
源電圧低下検出回路。 In a combination of a power supply voltage monitoring IC and a static type RAM, a two When the common power supply voltage falls below the minimum operating voltage of the IC, the output voltage of the voltage divider circuit is input to the chip select signal input terminal of the RAM as a disable or L label. A power supply voltage drop detection circuit characterized by:
JP6046686U 1986-04-21 1986-04-21 Pending JPS62175330U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6046686U JPS62175330U (en) 1986-04-21 1986-04-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6046686U JPS62175330U (en) 1986-04-21 1986-04-21

Publications (1)

Publication Number Publication Date
JPS62175330U true JPS62175330U (en) 1987-11-07

Family

ID=30892897

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6046686U Pending JPS62175330U (en) 1986-04-21 1986-04-21

Country Status (1)

Country Link
JP (1) JPS62175330U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01182995A (en) * 1988-01-18 1989-07-20 Oki Electric Ind Co Ltd Cmos semiconductor integrated circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5826390A (en) * 1981-08-10 1983-02-16 Hitachi Ltd Non-volatile memory
JPS5851318A (en) * 1981-09-22 1983-03-26 Matsushita Electric Works Ltd Controller
JPS6073720A (en) * 1983-09-29 1985-04-25 Nissin Electric Co Ltd Stand-by mode changeover circuit of random access memory

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5826390A (en) * 1981-08-10 1983-02-16 Hitachi Ltd Non-volatile memory
JPS5851318A (en) * 1981-09-22 1983-03-26 Matsushita Electric Works Ltd Controller
JPS6073720A (en) * 1983-09-29 1985-04-25 Nissin Electric Co Ltd Stand-by mode changeover circuit of random access memory

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01182995A (en) * 1988-01-18 1989-07-20 Oki Electric Ind Co Ltd Cmos semiconductor integrated circuit

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