JPH0353715A - Output buffer circuit - Google Patents

Output buffer circuit

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Publication number
JPH0353715A
JPH0353715A JP1189416A JP18941689A JPH0353715A JP H0353715 A JPH0353715 A JP H0353715A JP 1189416 A JP1189416 A JP 1189416A JP 18941689 A JP18941689 A JP 18941689A JP H0353715 A JPH0353715 A JP H0353715A
Authority
JP
Japan
Prior art keywords
output
gate
circuit
mos transistor
type
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
JP1189416A
Other languages
Japanese (ja)
Inventor
Kazuhisa Ninomiya
二宮 和久
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP1189416A priority Critical patent/JPH0353715A/en
Publication of JPH0353715A publication Critical patent/JPH0353715A/en
Pending legal-status Critical Current

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  • Logic Circuits (AREA)

Abstract

PURPOSE:To prevent an output driving MOS transistor(TR) from being in operation at a region where a power level is too high than required by adding a circuit controlling the gate potential of a transfer MOS TR and the source potential of an output driving p-channel MOS TR to a CMOS output buffer circuit. CONSTITUTION:The gate of an n-channel depletion MOS TR 18 is connected to the output E of a voltage suppressing circuit 10 and the drain is connected to the gate C of an output driving p-channel MOS TR 16p. The gate of an n-channel non-dope MOS TR 19 is connected to the output E of a voltage suppressing circuit 10 and the drain is connected to the gate D of an output driving n-channel MOS TR 17n. Let a threshold voltage level of n-channel MOS TRs M1-Mn be VTN, then the voltage VE at the output E of the voltage suppressing circuit does not exceed VTNXN even when the power potential VDD is boosted. Thus, the output driving MOS TRs 16p, 17n do not operate in a region where a higher power voltage is required.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はCMOS出力バッファ回路に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a CMOS output buffer circuit.

〔従来の技術〕[Conventional technology]

従来、この種のCMOS出力バッファ回路は、第2図に
示すような回路構成を取るものが一般的である. ここで11〜13はインバータ回路、14は2人力NO
R回路、15は2人力NAND回路、16.17はそれ
ぞれ出力駆動用n形、p@MoSトランジスタである。
Conventionally, this type of CMOS output buffer circuit generally has a circuit configuration as shown in FIG. Here, 11 to 13 are inverter circuits, and 14 is a two-man power NO.
R circuit, 15 is a two-way NAND circuit, and 16 and 17 are n-type and p@MoS transistors for output driving, respectively.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来のCMOS出力バッファ回路では、出力駆
動用MOSトランジスタがスイッチングすると、出力負
荷容量を充放電する電流変化と、基準電位配線及び電源
電位配線のインダクタンスにより、基準電位又は電源電
位が変動する。
In the above-described conventional CMOS output buffer circuit, when the output driving MOS transistor switches, the reference potential or power supply potential fluctuates due to changes in the current that charges and discharges the output load capacitance and the inductance of the reference potential wiring and the power supply potential wiring.

その結果、IC内部の誤動作を生ずるという欠点を有す
る. さらにこの基準電位や電源電位の変動の程度は電源電位
が高ければそれだけ大きくなる。
As a result, it has the disadvantage of causing malfunction inside the IC. Furthermore, the higher the power supply potential, the greater the degree of variation in the reference potential or power supply potential.

〔課題を解決するための手段〕[Means to solve the problem]

本発明のCMOS出力バッファ回路は、出力駆動n形M
OSトランジスタのゲートと、その前段のドライブ回路
の出力端子との間にトランスファー用第1のn形ノンド
ープMOSトランジスタ、出力駆動用p形MOSトラン
ジスタのゲートと、その前段のドライブ回路の出力端子
との間にトランスファー用第2のn形ディブレッション
MOSトランジスタ及び第1のn形ノンドーブMOSト
ランジスタのゲート電位と第2のn形ディブレッション
M O S トランジスタのゲート電位と、出力駆動用
p形MOSトランジスタのソース電位を制御する電圧制
御回路を有している. 〔実施例〕 次に本発明について図面を参照して説明する。
The CMOS output buffer circuit of the present invention has an output driving n-type M
A first n-type non-doped MOS transistor for transfer is connected between the gate of the OS transistor and the output terminal of the drive circuit in the previous stage, and a gate of the p-type MOS transistor for output drive is connected between the gate of the output drive p-type MOS transistor and the output terminal of the drive circuit in the previous stage. Between the gate potential of the second n-type depletion MOS transistor for transfer and the first n-type non-doped MOS transistor, the gate potential of the second n-type depletion MOS transistor, and the p-type MOS transistor for output drive. It has a voltage control circuit that controls the source potential. [Example] Next, the present invention will be described with reference to the drawings.

第1図は本発明の一実施例の回路図である.DATAは
データ入力端子D o w tは出力端子であり、それ
ぞれ逆論理である。11〜13はインバータ回路であり
、14はNOR回路、15はNAND回路である。
Figure 1 is a circuit diagram of one embodiment of the present invention. DATA is a data input terminal, D o w t is an output terminal, and each has a reverse logic. 11 to 13 are inverter circuits, 14 is a NOR circuit, and 15 is a NAND circuit.

またoeは出力制御信号である。Further, oe is an output control signal.

14はDATAとy丁を入力とし、その出力はAとなる
.このAはインバータ12を介して、18のn形ディブ
レッションMOS}−ランジスタのソースに接続される
14 takes DATA and y as input, and its output is A. This A is connected via an inverter 12 to the sources of 18 n-type depletion MOS transistors.

15はDATAと71を入力とし、その出力はBとなる
.Bはインバータ13を介してl9のn形ノンドーブM
OSトランジスタのソースに接続される. 15はDATAとoeを入力とし、その出力はBとなる
.Bはインバータ13を介して1つのn形ノンドーブM
OSトランジスタのソースに接続される. 18のn形ディプレッションMOSトランジスタのゲー
トは電圧抑制回路10の出力Eに接続され、またドレイ
ンは16pの出力駆動用p形MOSトランジスタのゲー
トCに接続される。
15 takes DATA and 71 as inputs, and its output is B. B is the n-type non-dove M of l9 via the inverter 13.
Connected to the source of the OS transistor. 15 takes DATA and oe as inputs, and its output is B. B is one n-type non-dove M via the inverter 13
Connected to the source of the OS transistor. The gate of the n-type depletion MOS transistor 18 is connected to the output E of the voltage suppression circuit 10, and the drain is connected to the gate C of the output driving p-type MOS transistor 16p.

19のn形ノンドープMOSトランジスタのゲートは電
圧抑制回路10の出力Eに接続されまたそのドレインは
17nの出力駆動用n形MOSトランジスタのゲートD
に接続される。
The gate of the n-type non-doped MOS transistor 19 is connected to the output E of the voltage suppression circuit 10, and its drain is connected to the gate D of the output driving n-type MOS transistor 17n.
connected to.

さらに上述電圧抑制回iW8 1 0は次のように楕戒
される。
Furthermore, the voltage suppression circuit iW8 1 0 described above is ellipticized as follows.

20はp形MOSトランジスタであり、そのソースは電
源VDDにゲートはoeに、ドレインは電圧抑制回路の
出力Eに、それぞれ接続されている。
20 is a p-type MOS transistor, the source of which is connected to the power supply VDD, the gate to oe, and the drain to the output E of the voltage suppression circuit.

さらに、Ml−M.はn形MOSトランジスタであり、
M1〜M0は順に直列に接続され、M,〜M.は各トラ
ンジスタのゲートはそのドレインに接続されている. さらにM.のドレインは電圧抑制回路の出力Eに、M.
のソースは基準電位■ssに接続されている。
Furthermore, Ml-M. is an n-type MOS transistor,
M1 to M0 are connected in series in order, and M, to M. The gate of each transistor is connected to its drain. Furthermore, M. The drain of M. is connected to the output E of the voltage suppression circuit, and the drain of M.
The source of is connected to the reference potential ■ss.

次に動作について説明する。Next, the operation will be explained.

今n形MOSトランジスタM1〜Mllのしきい値電圧
をVTNとすると、電圧抑制回路の出力Eの7K位■8
は次のようになる。
Now, if the threshold voltage of the n-type MOS transistors M1 to Mll is VTN, then the output E of the voltage suppression circuit is about 7K■8
becomes as follows.

i ) V on> V TNX nのとき Vg−V
BXni i ) VDoiVTNX nのとき V 
E = V DDこのように、この電圧抑制回路の出力
Eの電位は、電源電位VDDが上昇してもVTNxn以
上の電位にはならない。
i) When V on > V TNX n, Vg-V
BXni i) VDoiVTNX When n
E=V DD In this way, the potential of the output E of this voltage suppression circuit does not rise to a potential higher than VTNxn even if the power supply potential VDD rises.

したがって、出力駆動用MOSトランジスタ16p,1
7nが必要以上に高い電源電圧の領域で動作することは
なくなり、基準電位及び電源電位が変動するのを低減す
ることが可能である。
Therefore, the output driving MOS transistors 16p, 1
7n no longer operates in a region where the power supply voltage is higher than necessary, and it is possible to reduce fluctuations in the reference potential and power supply potential.

またn形MOSトランジスタMfiの個数nを調整する
ことにより、所望の電圧をある程度得ることが可能であ
る。
Further, by adjusting the number n of n-type MOS transistors Mfi, it is possible to obtain a desired voltage to some extent.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明は、CMOS出力バッファ回
路にトランスファー用MOSトランジスタ及びそのゲー
ト電位と、出力駆動用p形MOSトランジスタのソース
電位を制御する回路を付加することにより、出力駆動用
MOSトランジスタが電源電位の必要以上に高い領域で
動作することを抑制し、出力負荷容量の充放電の際の基
準電位及び電源電位の変動を抑えてIC内部の誤動作を
防止する効果を有する。
As explained above, the present invention adds a transfer MOS transistor and a circuit for controlling its gate potential, and a circuit for controlling the source potential of an output driving p-type MOS transistor to a CMOS output buffer circuit. This has the effect of suppressing operation in an area where the power supply potential is higher than necessary, suppressing fluctuations in the reference potential and power supply potential during charging and discharging of the output load capacitor, and preventing malfunctions inside the IC.

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

第1図は本発明の第1の実施例の回路図、簗4第今 図は従来のCMOS出力バッファ回路の一例の回路図で
ある。 11〜13・・・インバータ回路、14・・・NOR回
路、15・・・NAND回路、16p・・・出力駆動用
p形MOSトランジスタ、17n・・・出力駆動用n形
MOSトランジスタ、1つ・・・n形ノンドープMOS
トランジスタ、20・・・p形MOSトランジスタ、M
1〜n,1〜i・・・n形MOSトランジスタ、Ql〜
j・・・不揮発性メモリセルトランジスタ。
FIG. 1 is a circuit diagram of a first embodiment of the present invention, and FIG. 4 is a circuit diagram of an example of a conventional CMOS output buffer circuit. 11 to 13... Inverter circuit, 14... NOR circuit, 15... NAND circuit, 16p... P-type MOS transistor for output drive, 17n... N-type MOS transistor for output drive, one・N-type non-doped MOS
Transistor, 20...p-type MOS transistor, M
1~n, 1~i... n-type MOS transistor, Ql~
j...Nonvolatile memory cell transistor.

Claims (1)

【特許請求の範囲】[Claims] 出力駆動用n形MOSトランジスタのゲートとその前段
のドライブ回路の出力端子との間にトランスファー用n
形ノンドープMOSトランジスタと、出力駆動用p形M
OSトランジスタのゲートとその前段のドライブ回路の
出力端子との間にトランスファー用n形ディプレッショ
ンMOSトランジスタ及び前記n形ノンドープMOSト
ランジスタとn形ディプレッションMOSトランジスタ
のゲート信号と前記出力駆動用p型MOSトランジスタ
のソース電位を制御する電圧抑制回路とを含むことを特
徴とするCMOS出力バッファ回路。
Transfer n is connected between the gate of the output drive n-type MOS transistor and the output terminal of the preceding stage drive circuit.
type non-doped MOS transistor and p-type M for output driving
An n-type depletion MOS transistor for transfer is connected between the gate of the OS transistor and the output terminal of the drive circuit at the previous stage, and the gate signals of the n-type non-doped MOS transistor and the n-type depletion MOS transistor and the output driving p-type MOS transistor are connected. A CMOS output buffer circuit comprising: a voltage suppression circuit that controls a source potential.
JP1189416A 1989-07-21 1989-07-21 Output buffer circuit Pending JPH0353715A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1189416A JPH0353715A (en) 1989-07-21 1989-07-21 Output buffer circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1189416A JPH0353715A (en) 1989-07-21 1989-07-21 Output buffer circuit

Publications (1)

Publication Number Publication Date
JPH0353715A true JPH0353715A (en) 1991-03-07

Family

ID=16240901

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1189416A Pending JPH0353715A (en) 1989-07-21 1989-07-21 Output buffer circuit

Country Status (1)

Country Link
JP (1) JPH0353715A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05122050A (en) * 1991-10-25 1993-05-18 Nec Ic Microcomput Syst Ltd Output buffer
JPH07183780A (en) * 1993-12-24 1995-07-21 Nec Corp Output buffeer circuit
US6094067A (en) * 1997-04-08 2000-07-25 Mitsubishi Denki Kabushiki Kaisha Output buffer circuit
KR100833400B1 (en) * 2001-12-15 2008-05-28 주식회사 하이닉스반도체 Output buffer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05122050A (en) * 1991-10-25 1993-05-18 Nec Ic Microcomput Syst Ltd Output buffer
JPH07183780A (en) * 1993-12-24 1995-07-21 Nec Corp Output buffeer circuit
US6094067A (en) * 1997-04-08 2000-07-25 Mitsubishi Denki Kabushiki Kaisha Output buffer circuit
KR100833400B1 (en) * 2001-12-15 2008-05-28 주식회사 하이닉스반도체 Output buffer

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