JPS61208921A - Auto-reset circuit - Google Patents

Auto-reset circuit

Info

Publication number
JPS61208921A
JPS61208921A JP60050018A JP5001885A JPS61208921A JP S61208921 A JPS61208921 A JP S61208921A JP 60050018 A JP60050018 A JP 60050018A JP 5001885 A JP5001885 A JP 5001885A JP S61208921 A JPS61208921 A JP S61208921A
Authority
JP
Japan
Prior art keywords
voltage
circuit
power supply
reset
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
JP60050018A
Other languages
Japanese (ja)
Inventor
Masayoshi Achinami
阿知波 正義
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP60050018A priority Critical patent/JPS61208921A/en
Publication of JPS61208921A publication Critical patent/JPS61208921A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To save the accessory and to protect an electronic circuit from external noise by providing a reset circuit section acting like hysteresis to the amplitude of a power voltage into a single integrated circuit. CONSTITUTION:When a voltage rises and exceeds a diode VD after application of power supply VCC to the integrated circuit, an IIL transistor (Tr) 2 is conducted by a current from a Tr 1 to reset FFs 10, 11. When the voltage rises further to turn on a Tr 3, the Tr 2 is cut off, the reset of the FFs 10, 11 is released and the FFs 10, 11 goes to normal operating state. In this case, Trs 5, 6 are conducted, the Tr 6 enters the saturating state, the collector of the Tr 6 rises up to the power voltage and a voltage across a resistor R3 reaches a voltage being a division of the voltage VCC by resistors R2, R3. Then even when the power voltage drops abnormally due to noise and the VCC is decreased up to (1+R2/R3) times of the base-emitter voltage VBE, the circuit is operated normally.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、電源投入後の電源電圧立上り時に、電子回路
を初期設定し、電源が規定電圧に達した時点で電子回路
を待機状態にする、いわゆるオートリセット回路に関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method of initializing an electronic circuit when the power supply voltage rises after the power is turned on, and placing the electronic circuit in a standby state when the power supply reaches a specified voltage. This relates to an auto-reset circuit.

従来の技術 従来、この種のオートリセット回路として、第2図に示
すような構成のものが既知である。第2図においては、
リセットされる回路がIIL(注入型論理回路)で構成
されている例であるが、よく知られているように、II
LはPN接合の順方向立上り電圧(以下、ダイオード電
圧と略す)VD(約0.TV)以上の電圧が印加され\
ば動作状態に入シ得る。したがって、電源投入後電源電
圧がダイオードVDを越えた時点で、インジェクタトラ
ンジスタ1から供給された電流により、IILトランジ
スタ2が導通し、IILで構成されたフリップフロップ
回路10,11 、・・・・・・をリセットする。こ\
に抵抗9はIIL回路の多くのIILトランジスタに供
給する電流値を決定するだめのものである。ところでこ
の時点では、付加部品接続端子に接続の付加抵抗20.
21および容量22できまる時定数を、電源電圧vDD
がダイオード電圧VDにまで達する時間よりも十分大き
くとっておけば、トランジスタ3はしゃ断状態であシ、
上記のリセット動作を妨げない。
2. Description of the Related Art Conventionally, as this type of auto-reset circuit, one having a configuration as shown in FIG. 2 is known. In Figure 2,
In this example, the circuit to be reset is composed of IIL (injection type logic circuit), but as is well known, II
A voltage higher than the forward rising voltage of the PN junction (hereinafter abbreviated as diode voltage) VD (approximately 0.TV) is applied to L.
can enter the operating state. Therefore, when the power supply voltage exceeds the diode VD after the power is turned on, the IIL transistor 2 becomes conductive due to the current supplied from the injector transistor 1, and the flip-flop circuits 10, 11, . . .・Reset. child\
The resistor 9 is used to determine the current value supplied to many IIL transistors of the IIL circuit. By the way, at this point, the additional resistor 20. connected to the additional component connection terminal.
The time constant determined by 21 and capacitance 22 is determined by the power supply voltage vDD.
If the time is set sufficiently longer than the time for VD to reach the diode voltage VD, the transistor 3 will remain in the cut-off state.
Do not interfere with the above reset operation.

抵抗2oおよび容量22の値を、電源電圧が規定の電圧
に到達した時点でトランジスタ3が導通するような時定
数となるように選定しておけば、この時点でIIL)ラ
ンジスタ2はしゃ断し、リセット機能は開放され、フリ
ップフロップ回路10゜11は待機状態に入るのである
。
If the values of the resistor 2o and the capacitor 22 are selected to have a time constant such that the transistor 3 becomes conductive when the power supply voltage reaches a specified voltage, at this point IIL) the transistor 2 is cut off, The reset function is released and the flip-flop circuits 10 and 11 enter a standby state.

発明が解決しようとする問題点 このような従来の構成では、オートリセット機能のだめ
抵抗や容量といった付加部品が必要であること、付加部
品を接続するため、端子4を設けねばならず、こ\から
外来ノイズを受けやすく、同外来ノイズによってもフリ
ップフロップ回路がリセットされる等、内部の電子回路
の安定な動作を乱す等の問題があった。
Problems to be Solved by the Invention In such a conventional configuration, additional parts such as a resistor and a capacitor are required for the auto-reset function, and a terminal 4 must be provided to connect the additional parts. They are susceptible to external noise, and external noise causes problems such as resetting the flip-flop circuit and disrupting the stable operation of internal electronic circuits.

問題点を解決するための手段 この問題点を解決するために本発明は、オートリセット
回路として電源電圧の大きさに対し、ヒステリシス動作
をする機能を持たせたリセット回路部を単一集積回路の
中に構成したものである。
Means for Solving the Problem In order to solve this problem, the present invention incorporates a reset circuit section in a single integrated circuit as an auto-reset circuit, which has a function of performing hysteresis operation depending on the magnitude of the power supply voltage. It is configured inside.

作    用 この構成により、付加部品が削除でき、付加部品を接続
する端子が不要となること、及び電源電圧変動に対して
、ヒステリシス動作をさせるため、電子回路は外来ノイ
ズに対しても安定な動作をすることになる。
Function: With this configuration, additional parts can be removed, terminals for connecting additional parts are no longer required, and the electronic circuit operates stably even against external noise because it operates with hysteresis against power supply voltage fluctuations. will be done.

実施例 第1図はIILで構成されるフリップフロップのオート
リセット回路に本発明を適用しだ一実施例であり、以下
第1図を用いて説明する。
Embodiment FIG. 1 shows an embodiment in which the present invention is applied to an auto-reset circuit of a flip-flop constituted by an IIL, and will be described below with reference to FIG.

即ち、電源vccが投入され、電源電圧がダイオード電
圧VDを越えると、従来例で説明したようにIILで構
成されたフリップフロップ回路10.11・・・・・・
は動作可能な状態になる。このとき、IILトランジス
タ2は導通状態に入シ、フリップフロップ回路10.1
1・・・・・・をリセットシこれにより、電子回路(不
図示)を初期設定状態にする。
That is, when the power supply VCC is turned on and the power supply voltage exceeds the diode voltage VD, the flip-flop circuits 10, 11, 10, 11, 10, 10, 12, 12, 12, 12, 12, 12, 12, 23, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 12, 12, 12, 12, 12, 11, 12, 11, 11,, 11, 11,, 11,, 10,, 10, 11, and 11 , 10 , 11 , 11, Which are made of ?lls are activated, as described in the conventional example.
becomes operational. At this time, the IIL transistor 2 enters the conductive state, and the flip-flop circuit 10.1
1. This resets the electronic circuit (not shown) to the initial setting state.

説明の簡単のため、抵抗28.29は抵抗26゜26.
27より十分大きな抵抗値が選定されていると仮定する
と、電源電圧がさらに上昇し、抵抗27の両端の電圧が
トランジスタ3を導通させる電圧、即ちトランジスタ3
のベース、エミッタ間順方向立上り電圧をvBE (約
0.7V)とすると、電源電圧vccか に達すると、トランジスタ3が導通し、IILトランジ
スタ2はしゃ断状態になシ、フリップフロップ回路10
.11・・・・・・のリセットは解除される。
For simplicity of explanation, resistor 28.29 is replaced by resistor 26°26.
Assuming that a resistance value sufficiently larger than 27 is selected, the power supply voltage will further rise and the voltage across resistor 27 will become the voltage that makes transistor 3 conductive, i.e. transistor 3.
Assuming that the forward rising voltage between the base and emitter of is vBE (approximately 0.7 V), when the voltage reaches the power supply voltage vcc, the transistor 3 becomes conductive and the IIL transistor 2 is not in the cut-off state.
.. The reset of 11... is canceled.

以後電源電圧が規定の電圧に達したときにはフリップフ
ロップ回路10,11・・・・・・は待機状態に入り外
部より信号が入力されると回路構成にしたがって信号を
処理するのである。
Thereafter, when the power supply voltage reaches a specified voltage, the flip-flop circuits 10, 11, . . . enter a standby state, and when a signal is input from the outside, the signal is processed according to the circuit configuration.

ところで電源に規定の電圧vccが印加されているとき
には回路の正常な動作は保証されるのであるが、電源ラ
インにノイズが印加されるなど異常時に於て、電源電圧
が上記の電圧 よりも低下すると、例え瞬時であってもトランジスタ3
はしゃ断し、IIL)ランジスタ2は導通して、フリッ
プフロップ10.11・・・・・・はリセットされ、し
たがって、これに結合された電子回路は異常動作を行う
。第1図中トランジスタ6.6はこのような不都合を解
消するために追加されたものであり電源が投入されトラ
ンジスタ3が導通し、IIL)ランジスタ2がしゃ断し
て、リセットが解除される時、トランジスタ6およびト
ランジス−タロが導通し、トランジスタeは飽和に入る
ためトランジスタ6のコレクタは電源電圧にまで上昇す
る。電源に規定の電圧が印加されておシ回路が正常な動
作をしている期間もこの状態は保持されているため抵抗
27の両端の電圧はとなる。
By the way, normal operation of the circuit is guaranteed when the specified voltage VCC is applied to the power supply, but in abnormal situations such as when noise is applied to the power supply line, if the power supply voltage drops below the above voltage. , even if it is instantaneous, transistor 3
IIL) The transistor 2 becomes conductive and the flip-flops 10, 11, . Transistor 6.6 in FIG. 1 was added to solve this problem. When the power is turned on, transistor 3 becomes conductive, transistor 2 is cut off, and the reset is released. Transistor 6 and transistor RO become conductive, and transistor e enters saturation, so that the collector of transistor 6 rises to the power supply voltage. Since this state is maintained even during the period when a specified voltage is applied to the power supply and the circuit is operating normally, the voltage across the resistor 27 is as follows.

したがってこ\で電源電圧が異常低下をきたしても、ト
ランジスタ6および同6より構成される回路を追加する
ことによりミ源電圧vccが、トランジスタ5のミース
、エミッタ間順方向立上り電圧をvBE  (約0.T
V)、!:してに低下するまで回路は正常に動作するこ
とが保証されるのである。
Therefore, even if the power supply voltage drops abnormally, by adding transistor 6 and a circuit made up of transistor 6, the source voltage vcc can be increased by increasing the forward rising voltage between the meath and emitter of transistor 5 to vBE (approximately 0.T
V),! : The circuit is guaranteed to operate normally until the voltage drops to below.

発明の効果 本発明によれば、集積回路の周辺に用いられる付加部品
を削減できるという経済的効果に加えて、電子回路を外
来ノイズから保護し、信頼性の高いシステムの構築が可
能となり、その実用的価値は高いといえる。
Effects of the Invention According to the present invention, in addition to the economical effect of being able to reduce the number of additional parts used around integrated circuits, it is possible to protect electronic circuits from external noise and construct a highly reliable system. It can be said that the practical value is high.

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

第1図は本発明の一実施例によるオー) IJセット回
路を示す回路図、第2図は従来用いられてきた付加部品
による構成のオートリセット回路の回路図である。 1・・・・・・インジェクタトランジスタ、2・・・・
・・IILトランジスタ、3,5,6・・・・・・トラ
ンジスタ、4゛ ・・・・・・付加部品接続端子、9.
2g、26,27゜28.29,30・・・・・・抵抗
、10,11・・・・・・フリップフロップ回路、21
.20・・・・・・付加抵抗、22・・−・・・容量。 代理人の氏名 弁理士 中 尾 敏 男 ほか1名w&
1  因 Jトランジスタ 第2図
FIG. 1 is a circuit diagram showing an O/J set circuit according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of an auto-reset circuit configured with conventionally used additional parts. 1... Injector transistor, 2...
...IIL transistor, 3,5,6...transistor, 4゛...additional component connection terminal, 9.
2g, 26,27°28.29,30...Resistance, 10,11...Flip-flop circuit, 21
.. 20...Additional resistance, 22...Capacity. Name of agent: Patent attorney Toshio Nakao and one other person w&
1 Cause J transistor diagram 2

Claims (1)

【特許請求の範囲】[Claims] 電源投入後の電源電圧上昇時に、第1の所定電源電圧で
電子回路を初期設定させるリセット回路および前記第1
の電源電圧より高い第2の電源電圧以上の電圧で、前記
リセット回路を開放にするとともに規定の電源電圧印加
後の電圧低下時、第2の電源電圧より低い電圧まで前記
リセット回路を開放に保つためのヒステレシスバイアス
回路をそなえたオートリセット回路。
a reset circuit that initializes the electronic circuit with a first predetermined power supply voltage when the power supply voltage rises after the power is turned on; and the first
The reset circuit is opened at a voltage equal to or higher than a second power supply voltage which is higher than the power supply voltage, and when the voltage drops after application of a specified power supply voltage, the reset circuit is kept open until a voltage lower than the second power supply voltage. Auto-reset circuit with hysteresis bias circuit for
JP60050018A 1985-03-13 1985-03-13 Auto-reset circuit Pending JPS61208921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60050018A JPS61208921A (en) 1985-03-13 1985-03-13 Auto-reset circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60050018A JPS61208921A (en) 1985-03-13 1985-03-13 Auto-reset circuit

Publications (1)

Publication Number Publication Date
JPS61208921A true JPS61208921A (en) 1986-09-17

Family

ID=12847253

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60050018A Pending JPS61208921A (en) 1985-03-13 1985-03-13 Auto-reset circuit

Country Status (1)

Country Link
JP (1) JPS61208921A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6392444B1 (en) 1999-04-28 2002-05-21 Sharp Kabushiki Kaisha IIL reset circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6392444B1 (en) 1999-04-28 2002-05-21 Sharp Kabushiki Kaisha IIL reset circuit

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