JPS6051022A - Power-on resetting circuit - Google Patents

Power-on resetting circuit

Info

Publication number
JPS6051022A
JPS6051022A JP15970683A JP15970683A JPS6051022A JP S6051022 A JPS6051022 A JP S6051022A JP 15970683 A JP15970683 A JP 15970683A JP 15970683 A JP15970683 A JP 15970683A JP S6051022 A JPS6051022 A JP S6051022A
Authority
JP
Japan
Prior art keywords
reset
power supply
vbe
constant current
power
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
JP15970683A
Other languages
Japanese (ja)
Inventor
Yukihiro Ukai
幸弘 鵜飼
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP15970683A priority Critical patent/JPS6051022A/en
Publication of JPS6051022A publication Critical patent/JPS6051022A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
    • H03K2017/226—Modifications for ensuring a predetermined initial state when the supply voltage has been applied in bipolar transistor switches

Abstract

PURPOSE:To reset the rise of a power supply voltage within an optional time constant extending from a high speed to a low speed by connecting a constant current source connected in series to a power source line, and the connecting point of a capacitor, to the base of a transistor through plural diodes. CONSTITUTION:When a power supply voltage VCC attains to a base - emitter voltage VBE of transistors (TR) TR1, TR2, the TR TR1 turns on, and a reset signal is outputted by using the collector of the TR TR1 as the ground potential. Also, when the potential of connecting point A of a constant current source I and a capacitor C1 goes to (n+1)VBE, the TR TR2 turns on and leads in a base current of the TR TR1, therefore, the TR TR1 turns off, and the output of the reset signal is released. In this case, when the constant current source I is operated by the voltage VBE or above, at least a time of t0=C1.(n+1)VBE/If is required (If is a constant current value). Accordingly, when IfC1 corresponding to the operating speed of a logical circuit to be reset is determined, a power-on reset is operated, irrespectively of a high speed of rise of the power supply voltage VCC.

Description

【発明の詳細な説明】 く技術分野〉 本発明は、電源電圧の立上りに応じて、ロジック回路等
へのりセント信号を発生するパワー・オン・リセット回
路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a power-on reset circuit that generates a rising signal to a logic circuit or the like in response to the rise of a power supply voltage.

〈従来技術〉 従来のパワー・オン・リセット回路は、電圧検知型が多
く、電源電圧が高速に立上った時には、リセットがかか
らない場合がでて（る。また、内部発振器利用の型では
、内部発振器を持たないロジックには利用てきないとい
う欠点があった。<Prior art> Most conventional power-on reset circuits are of the voltage detection type, and when the power supply voltage rises rapidly, the reset may not be activated. The drawback was that it could not be used for logic that did not have an internal oscillator.

〈発明の目的〉 本発明は、簡単な回路構成で、電源電圧が高速立上り時
及び低速立上り時両者に於いて動作するように構成され
たパワー・オン・リセット回路を提供するものである。<Objective of the Invention> The present invention provides a power-on reset circuit that has a simple circuit configuration and is configured to operate both when the power supply voltage rises quickly and when it rises slowly.

〈実施例〉 図面は本発明の一実施例を示す回路図である。<Example> The drawing is a circuit diagram showing an embodiment of the present invention.

ｌ　、ｌ　は電源ラインで、４２　をＧＮＤ　（グ２ ランドレベル）として１１　に電源電圧Ｖｃｃ　を印加
するようにしている。Ｔ　ｒ　１．　Ｔ　ｒ２はトラン
ジスタで、Ｔｒ、のベースとＴｒ２　のコレクタを接続
するとともに、該接続点を抵抗Ｒ１を介して電源ライン
１１に接続している。ＤはＴ　ｒ　２のベースに直列接
続されたｎ個のダイオードである。1 and 1 are power supply lines, 42 is set to GND (ground level), and power supply voltage Vcc is applied to 11. T r 1. Tr2 is a transistor, which connects the base of Tr and the collector of Tr2, and connects the connection point to the power supply line 11 via a resistor R1. D are n diodes connected in series to the base of T r 2.

■は定電流源、Ｃ３はコンデンサで、電源ディン１、、
（１２間に直列接続され、その接続点Ａはｎ個のダイオ
ードＤの他端に接続される。■ is a constant current source, C3 is a capacitor, power supply Din 1,...
(12 are connected in series, and the connection point A is connected to the other ends of n diodes D.

以上のような構成で、電源電圧ＶｃｃがＶＢＥ（トラン
ジスタＴｒ、、Ｔｒ２のベース・エミッタ電圧）になる
とＴ　ｒ　＋　がオンし、Ｔ　ｒ　＋のコレクタをグラ
ンドレベルとしてリセット信号を出力する。また、定電
流源■とコンデンサＣ１の接続点Ａの電位が（ｎ＋１）
ＶｎＥ　となると、Ｔ　ｒ　２がオンし、Ｔ　ｒ　＋　
のベース電流をＴｒ２　に引き込むため、Ｔｒ＋　がオ
フし、リセット信号の出力は解除される。With the above configuration, when the power supply voltage Vcc becomes VBE (base-emitter voltage of transistors Tr, Tr2), Tr + is turned on, and the collector of Tr + is set to the ground level and a reset signal is output. Also, the potential at the connection point A between the constant current source ■ and the capacitor C1 is (n+1)
When VnE is reached, T r 2 turns on and T r +
In order to draw the base current of Tr2 into Tr2, Tr+ is turned off and the output of the reset signal is canceled.

ここで、Ａ点の電位は、定電流Ｉｆとコンデンサの容量
Ｃ１によって決まるため（Ｖ＝Ｉｆ−ｔ／Ｃ，、ｔは時
−間）、電源電圧Ｖｃｃの立上がりが急峻であっても、
Ａ点の電位が（ｎ＋１）ＶＢＥになるには、ｔｆが流れ
出してからｔ。−Ｃ１・（ｎ　＋　１　）・ＶＢＥ／Ｉ
ｆの時間がかかる。このことにより、定電流源■がＶＢ
Ｅ以上で動作するようにすれば、最低【。−Ｃ１・（ｎ
＋１）・ｖＢＥ／Ｉｆのりセント信号が得られる。リセ
ットされるロジック回路の動作速度に見合ったＩｆ、Ｃ
，を決定すれば、電源電圧Ｖｃｃの立上がりがいかに高
速でもパワー・オン・リセットが動作できる。Here, since the potential at point A is determined by the constant current If and the capacitance C1 of the capacitor (V=If-t/C, t is time), even if the power supply voltage Vcc rises steeply,
In order for the potential at point A to reach (n+1)VBE, it takes t after tf begins to flow. -C1・(n+1)・VBE/I
It takes f time. As a result, the constant current source ■ becomes VB
If you make it work at E or higher, the minimum [. -C1・(n
+1)・vBE/If signal is obtained. If and C commensurate with the operating speed of the logic circuit to be reset.
, the power-on reset can operate no matter how fast the power supply voltage Vcc rises.

なお、（ｎ　＋　ｌ）　ＶＢＥ　はハ１７−−、ｔ’％
、−ＩＪ上セツト路の上限電圧を決定し、ここでは対象
のロジック回路を安定に動作させるため、ダイオードの
数ｎもこれによって一義的に決められているものとする
。In addition, (n + l) VBE is Ha17−, t'%
, -IJ upper limit voltage is determined, and in order to stably operate the target logic circuit, it is assumed here that the number n of diodes is also uniquely determined by this.

また、電源電圧Ｖｃｃの立上りが遅く、Ａ点の電位がＶ
ｃｃ　と同様に変化する場合でも、トランジスタＴｒ＋
　がオンしてからＴｒ２がオンする、つまりＡ点の電位
がｖＢＥ　〜（ｎ＋１）・ＶＢＥ　の間リセット信号は
出力されるので、この場合も確実にパワー・オン・リセ
ットが動作することになる。In addition, the rise of the power supply voltage Vcc is slow, and the potential at point A is V
Even if it changes in the same way as cc, the transistor Tr+
Since Tr2 is turned on after Tr2 is turned on, that is, the reset signal is output while the potential at point A is between vBE and (n+1)·VBE, the power-on reset will surely operate in this case as well.

以上のように本回路は、電源電圧Ｖｃｃの立上りが高速
から低速まで任意の時定数の範囲でリセットをかけ得、
４る５−ことができる。As described above, this circuit can reset the power supply voltage Vcc in any time constant range from fast to slow rise.
4 ru 5- I can do it.

〈発明の効果〉 このように本発明によれば、簡単な回路構成により、電
源電圧の立上がりの如何んに関わらす確実にリセットを
かけることができる有用なパワー・オン・リセット回路
が提供できる。<Effects of the Invention> As described above, according to the present invention, a useful power-on reset circuit can be provided with a simple circuit configuration that can reliably perform reset regardless of the rise of the power supply voltage.

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

図面は本発明の一実施例を示す回路図である。 １１　・ｔ！２・・・電源ライン、Ｔｒｌ　・Ｔｒ２・
・・トランジスタ、Ｒ１・・・抵抗、Ｄ・・ダイオード
、■・・・定電流源、Ｃ１・・コンデンサ。The drawing is a circuit diagram showing an embodiment of the present invention. 11 ・t! 2...Power line, Trl・Tr2・
...Transistor, R1...Resistor, D...Diode, ■...Constant current source, C1...Capacitor.

Claims (1)

【特許請求の範囲】 １　ベース・コレクタを接続した第１のトランジスタ（
Ｔｒｙ）及び第２のトランジスタ（Ｔｒ２）を備え、前
記ベース・コレクタの接続点を抵抗（Ｒ１）を介し電源
ラインに接続し、前記電源列 ラインに直情接続した定電流源（Ｉ）とコンデンサ（Ｃ
１）の接続点をｎ個のダイオード（Ｄ）を介し前記第２
のトランジスタ（’Ｔ　ｒ　２　）のベースに接続して
なることを特徴とするパワー・オン・リセット回路。[Claims] 1. A first transistor with a base and collector connected (
Try) and a second transistor (Tr2), the base-collector connection point is connected to the power supply line via a resistor (R1), and a constant current source (I) directly connected to the power supply line and a capacitor ( C
The connection point of 1) is connected to the second node through n diodes (D).
A power-on reset circuit characterized in that it is connected to the base of a transistor ('T r 2 ).
JP15970683A 1983-08-29 1983-08-29 Power-on resetting circuit Pending JPS6051022A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15970683A JPS6051022A (en) 1983-08-29 1983-08-29 Power-on resetting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15970683A JPS6051022A (en) 1983-08-29 1983-08-29 Power-on resetting circuit

Publications (1)

Publication Number Publication Date
JPS6051022A true JPS6051022A (en) 1985-03-22

Family

ID=15699518

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15970683A Pending JPS6051022A (en) 1983-08-29 1983-08-29 Power-on resetting circuit

Country Status (1)

Country Link
JP (1) JPS6051022A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004021539A3 (en) * 2002-08-30 2004-04-22 Koninkl Philips Electronics Nv Transition detection at input of integrated circuit device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004021539A3 (en) * 2002-08-30 2004-04-22 Koninkl Philips Electronics Nv Transition detection at input of integrated circuit device

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