JPS6368053U - - Google Patents

Info

Publication number
JPS6368053U
JPS6368053U JP16038686U JP16038686U JPS6368053U JP S6368053 U JPS6368053 U JP S6368053U JP 16038686 U JP16038686 U JP 16038686U JP 16038686 U JP16038686 U JP 16038686U JP S6368053 U JPS6368053 U JP S6368053U
Authority
JP
Japan
Prior art keywords
ram
terminal
chip enable
power source
transistor
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
JP16038686U
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 JP16038686U priority Critical patent/JPS6368053U/ja
Publication of JPS6368053U publication Critical patent/JPS6368053U/ja
Pending legal-status Critical Current

Links

Description

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

第１図は本考案のＲＡＭのチツプイネーブル信
号回路、第２図はその動作説明のための波形図で
ｔ１は電源投入時、ｔ２は電源切断時を示す。第
３図は従来回路を示す回路図である。 １……リセツト回路、Ｒ１・Ｒ２・Ｒ３・Ｒ４
・Ｒ５・Ｒ６・Ｒ７……抵抗、Ｄ１・Ｄ２・Ｄ３
・Ｄ４・Ｄ５……ダイオード、Ｃ……コンデンサ
、Ｑ１・Ｑ２……トランジスタ、Ｘ″ｔａｌ……
水晶発振器、ＶＣＣ……システム電源、ＶＮ……
バツテリ、ＶＲ……リセツト信号、ＶＣ１……ト
ランジスタＱ１のコレクタ電位、ＶＣ２……トラ
ンジスタＱ２のコレクタ電位、ＶＤＤ……ＲＡＭ
及びＣＰＵの電源端子、ＣＥ２……ＲＡＭのチツ
プイネーブル端子、ＲＳＴ……ＣＰＵのリセツト
端子。 FIG. 1 is a chip enable signal circuit of a RAM according to the present invention, and FIG. 2 is a waveform diagram for explaining its operation, where t1 shows when the power is turned on and t2 shows when the power is turned off. FIG. 3 is a circuit diagram showing a conventional circuit. 1...Reset circuit, R1 , R2 , R3 , R4
・R 5・R 6・R 7 ...Resistance, D 1・D 2・D 3
・D 4・D 5 ……diode, C ……capacitor, Q 1・Q 2 ……transistor, X″tal……
Crystal oscillator, VCC...system power supply, VN...
Battery, VR...Reset signal, VC1 ...Collector potential of transistor Q1, VC2...Collector potential of transistor Q2 , VDD...RAM
and CPU power supply terminal, CE2...RAM chip enable terminal, RST...CPU reset terminal.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 電池電源と他の直流電源とをそれぞれダイオー
ドを介してＲＡＭの直流駆動電源端子に接続し、
ＣＰＵのリセツト信号出力端を積分回路を介して
エミツタ接地トランジスタのベースに接続し、該
トランジスタのコレクタを前記ＲＡＭのチツプイ
ネーブル端子に接続してなるＲＡＭのチツプイネ
ーブル回路。 A battery power source and another DC power source are each connected to the DC drive power terminal of the RAM via a diode,
A chip enable circuit for a RAM, in which a reset signal output terminal of a CPU is connected to the base of a common emitter transistor via an integrating circuit, and a collector of the transistor is connected to a chip enable terminal of the RAM.
JP16038686U 1986-10-20 1986-10-20 Pending JPS6368053U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16038686U JPS6368053U (en) 1986-10-20 1986-10-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16038686U JPS6368053U (en) 1986-10-20 1986-10-20

Publications (1)

Publication Number Publication Date
JPS6368053U true JPS6368053U (en) 1988-05-07

Family

ID=31085717

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16038686U Pending JPS6368053U (en) 1986-10-20 1986-10-20

Country Status (1)

Country Link
JP (1) JPS6368053U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63122087A (en) * 1986-11-12 1988-05-26 Nec Corp Dynamic storage device
JPH03283091A (en) * 1990-03-29 1991-12-13 Nec Corp Semiconductor memory circuit device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59132022A (en) * 1983-12-23 1984-07-30 Matsushita Electric Ind Co Ltd Backup circuit of semiconductor ic
JPS6025035B2 (en) * 1977-04-15 1985-06-15 松下電工株式会社 electrical equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6025035B2 (en) * 1977-04-15 1985-06-15 松下電工株式会社 electrical equipment
JPS59132022A (en) * 1983-12-23 1984-07-30 Matsushita Electric Ind Co Ltd Backup circuit of semiconductor ic

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63122087A (en) * 1986-11-12 1988-05-26 Nec Corp Dynamic storage device
JPH03283091A (en) * 1990-03-29 1991-12-13 Nec Corp Semiconductor memory circuit device

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