JPS6284619A - Interface circuit - Google Patents

Interface circuit

Info

Publication number
JPS6284619A
JPS6284619A JP60225236A JP22523685A JPS6284619A JP S6284619 A JPS6284619 A JP S6284619A JP 60225236 A JP60225236 A JP 60225236A JP 22523685 A JP22523685 A JP 22523685A JP S6284619 A JPS6284619 A JP S6284619A
Authority
JP
Japan
Prior art keywords
circuit
voltage
ttl
power source
line
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
JP60225236A
Other languages
Japanese (ja)
Inventor
Susumu Takahashi
晋 高橋
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP60225236A priority Critical patent/JPS6284619A/en
Publication of JPS6284619A publication Critical patent/JPS6284619A/en
Pending legal-status Critical Current

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  • Logic Circuits (AREA)

Abstract

PURPOSE:To connect a TTL gate circuit to a CMOS circuit through simple constitution by connecting the TTL gate circuit between a power source line and an earth line and also connecting the CMOS gate circuit to the power source line through a diode. CONSTITUTION:Output pins of the TTL.IC circuit 7 are connected to input pins of the CMOS.IC circuit 8 respectively and the earth pin and power source pin of the circuit 7 are connected to the earth line 2 and power source line 1 respectively. The earth pin of the circuit 8 is connected to the earth line 2, but the power source pin is connected to the cathode of the diode 10, so that the source voltage obtained by subtracting the forward voltage drop across the diode 10 is supplied to the power source pin of the circuit 8. Consequently, the voltage which is about 0.7V lower than the source voltage is supplied to the power source pin of the circuit 8 regardless of the number of the gates of the circuit 8. Therefore, when the source voltage is V5, a 4.3V driving voltage is supplied and an input threshold voltage is about 2.15V. This value is much smaller than 2.4V which is the minimum value of the level of logic 1, so logical operation is performed securely.

Description

【発明の詳細な説明】 〔概要〕 TTLゲート回路とCMOSゲート回路とのインタフェ
ース回路であって、CMOSゲート回路の電源ラインに
ダイオードを挿入してCMO3回路のスレッシュホール
ド電圧を調整し、プルアップ抵抗を用いることなくTT
Lゲート回路とCMOSゲート回路とのインタフェース
を図る。
[Detailed Description of the Invention] [Summary] This is an interface circuit between a TTL gate circuit and a CMOS gate circuit, in which a diode is inserted into the power supply line of the CMOS gate circuit to adjust the threshold voltage of the CMO3 circuit, and a pull-up resistor is used. TT without using
An interface between the L gate circuit and the CMOS gate circuit is planned.

〔産業上の利用分野〕[Industrial application field]

本発明はTTLロジックによるハスラインと他の回路間
に挿入するに好適なCMOsインタフェース回路に関す
るもので、さらに詳しく言えば、電源を共通にするTT
Lロジック回路とCMOSゲート回路との接続において
、プルアップ抵抗を用いることなく動作を可能にしたイ
ンタフェース回路に関するものである。
The present invention relates to a CMOS interface circuit suitable for insertion between a Hass line using TTL logic and other circuits.
The present invention relates to an interface circuit that can operate without using a pull-up resistor in connection between an L logic circuit and a CMOS gate circuit.

電源電圧を5■に設定された多(のTTLゲート回路の
出力ピンの電圧条件は、論理ルベルで2.4〜5V、論
理0レヘルで0〜0.4■となっている。これに対し、
CMO3−ICの大カスレソシュホールド電圧は、電源
電圧の1/2以上に設定されている。このためハイイン
ピーダンス特性を有する0M03回路を介してTTLゲ
ート回路の出力を他の回路に供給するような用途におい
ては、動作電圧を調整する必要がある。動作電圧の調整
には一般にTTLゲート回路と0M03回路との接続点
にプルアップ抵抗を接続し、論理lにおけるCMOSゲ
ート回路の入力電圧を入力スレソシュホールド値以上に
している。然るに、TTLロジックによるパスラインと
他の回路間にCMOSゲート回路を挿入するような場合
はゲート数を多く必要とするのでプルアップ抵抗の数も
多くなり、小型化(実装スペースの増大)の点で問題が
ある。
The voltage condition of the output pin of the TTL gate circuit with the power supply voltage set to 5■ is 2.4 to 5V in logic level and 0 to 0.4V in logic 0 level. ,
The large dropout voltage of the CMO3-IC is set to 1/2 or more of the power supply voltage. Therefore, in applications where the output of the TTL gate circuit is supplied to other circuits via the 0M03 circuit having high impedance characteristics, it is necessary to adjust the operating voltage. To adjust the operating voltage, a pull-up resistor is generally connected to the connection point between the TTL gate circuit and the 0M03 circuit, and the input voltage of the CMOS gate circuit at logic 1 is set to be equal to or higher than the input threshold value. However, when inserting a CMOS gate circuit between a pass line based on TTL logic and other circuits, a large number of gates is required, which results in a large number of pull-up resistors, making it difficult to downsize (increase mounting space). There is a problem with this.

そのために、多くのプルアップ抵抗を用いることなくパ
スラインにおけるTTLゲート回路と0M03回路との
接続が可能なインタフェース回路の1是供が要望されて
いる。
Therefore, it is desired to provide an interface circuit that can connect the TTL gate circuit and the 0M03 circuit in the pass line without using many pull-up resistors.

〔従来の技術〕 第3図に示すように、電源ライン1とアースライン2と
の間に夫々接続さたTTLゲート回路1とCMOSゲー
ト回路4とのインクフェースに際しては従来、TTLゲ
ート回路1及びCMOSゲート回路4との接続点と電源
ライン1の間にプルアンプ抵抗6を接続し、論理1の時
のTTLゲート回路1の出力ビンの電圧がCMOSゲー
ト回路4の入力スレッシュホールド電圧以上になるよう
にしている。第4図はパスライン等の複数の信号を扱う
回路におけるTTL・IC回路7とCMO8・IC回路
8との接続を示す回路図であって、TTL・rc回路7
及びCMO3・IC回路8と同数のプルアンプ抵抗9が
用いられる。
[Prior Art] As shown in FIG. 3, conventionally, when connecting the TTL gate circuit 1 and the CMOS gate circuit 4 connected between the power supply line 1 and the ground line 2, the TTL gate circuit 1 and the CMOS gate circuit 4 are A pull amplifier resistor 6 is connected between the connection point with the CMOS gate circuit 4 and the power supply line 1, so that the voltage of the output bin of the TTL gate circuit 1 when the logic is 1 is higher than the input threshold voltage of the CMOS gate circuit 4. I have to. FIG. 4 is a circuit diagram showing the connection between the TTL/IC circuit 7 and the CMO 8/IC circuit 8 in a circuit that handles multiple signals such as a pass line.
And the same number of pull amplifier resistors 9 as CMO3/IC circuits 8 are used.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

この従来方式ではTTLロジックによるパスラインと他
の回路間にCMO3−ICを挿入するような場合にプル
ア・7プ抵抗の数が多くなり、小型化及び省スペースの
点で問題を有する。
In this conventional method, when a CMO3-IC is inserted between a pass line based on TTL logic and another circuit, the number of pull-up and pull-up resistors increases, which poses a problem in terms of miniaturization and space saving.

本発明はこのような点に鑑みて創作されたもので、簡易
な構成でTTLゲート回路と0M03回路との接続を可
能にしたインタフェース回路を提供することを目的とし
ている。
The present invention was created in view of these points, and an object of the present invention is to provide an interface circuit that allows connection between a TTL gate circuit and an 0M03 circuit with a simple configuration.

〔問題点を解決するための手段〕[Means for solving problems]

第1図は本発明の原理図であって、電源ラインlとアー
スライン2との間にTTLゲート回路3が接続されると
共にダイオード5を介してCMOSゲート回路4の電源
端子が電源ライン1に接続される。
FIG. 1 is a diagram showing the principle of the present invention, in which a TTL gate circuit 3 is connected between a power line 1 and an earth line 2, and a power terminal of a CMOS gate circuit 4 is connected to a power line 1 via a diode 5. Connected.

即ち、プルアップ抵抗を用いずにTTLゲート回路3の
出力ピンがCMOSゲート回路4の入力ピンに接続され
る。
That is, the output pin of the TTL gate circuit 3 is connected to the input pin of the CMOS gate circuit 4 without using a pull-up resistor.

〔作用〕[Effect]

CMOSゲート回路4の電源端子に接続されたダイオー
ドが凡そ0.7 Vの順方向電圧降下特性を持つので電
源ライン1に5■の電圧が供給される場合、CMOSゲ
ート回路4の電源端子には凡そ4.3■の電圧が供給さ
れる。一般にCMO3・ICの入力スレッシュホールド
電圧は供給電源電圧の凡そ1/2どなるため、ダイオー
ド5の挿入によりCMOSゲート回路4の入力スレッシ
ュホールド電圧は凡そ2.15Vとなり、TTLゲート
回路3の論理ルベルの最小値である2、4V以下となる
。このためTTLとCMO3間のインタフェースが達成
される。
Since the diode connected to the power supply terminal of the CMOS gate circuit 4 has a forward voltage drop characteristic of approximately 0.7 V, when a voltage of 5V is supplied to the power supply line 1, the power supply terminal of the CMOS gate circuit 4 has a forward voltage drop characteristic of approximately 0.7 V. A voltage of approximately 4.3μ is supplied. In general, the input threshold voltage of the CMO3 IC is approximately 1/2 of the supply voltage, so by inserting the diode 5, the input threshold voltage of the CMOS gate circuit 4 becomes approximately 2.15V, which reduces the logic level of the TTL gate circuit 3. It will be below the minimum value of 2.4V. An interface between TTL and CMO3 is thus achieved.

〔実施例〕〔Example〕

第2図は本発明の実施例を示す。この実施例はコンピュ
ータのハスラインに適用した例である。
FIG. 2 shows an embodiment of the invention. This embodiment is an example applied to a computer lotus line.

TTL−IC回路7の出力ビンがCMO3−IC回路8
の入力ピンに夫々接続される。また、TTL・IC回路
7のアースピン及び電源ピンがアースライン2及び電源
ライン1に夫々接続される。
The output bin of TTL-IC circuit 7 is CMO3-IC circuit 8
are connected to the input pins of Further, the ground pin and power pin of the TTL IC circuit 7 are connected to the ground line 2 and the power line 1, respectively.

一方、CMO3−IC回路8のアースピンはアースライ
ン2に接続されるが、電源ピンはダイオード10のカソ
ードに接続され、ダイオード10による順方向電圧降下
を差し引いた電源電圧がCM03−IC回路8の電源ピ
ンに供給される。ダイオード10は広範な負荷電流の変
化に対してほぼ一定の順方向電圧降下特性を有するので
CMO3・IC回路8のゲート数に拘らず電源電圧より
凡そ0.7V低い電圧をCMO3−IC回路8の電源ピ
ンに供給する。従って、電源電圧が5■の場合、4.3
■の駆動電圧が与えられ、入力スレッシュホールド電圧
は凡そ2.15 Vになる。この値はTTL・IC回路
7の論理ルベルの最小値である2、4■より充分低いの
で確実に論理動作が可能である。
On the other hand, the ground pin of the CMO3-IC circuit 8 is connected to the ground line 2, but the power supply pin is connected to the cathode of the diode 10, and the power supply voltage after subtracting the forward voltage drop due to the diode 10 is the power supply voltage of the CM03-IC circuit 8. supplied to the pin. Since the diode 10 has a nearly constant forward voltage drop characteristic over a wide range of changes in load current, the diode 10 maintains a voltage approximately 0.7V lower than the power supply voltage of the CMO3-IC circuit 8, regardless of the number of gates in the CMO3-IC circuit 8. Supply to power pin. Therefore, if the power supply voltage is 5■, 4.3
A driving voltage of (2) is applied, and the input threshold voltage is approximately 2.15V. This value is sufficiently lower than the minimum value of the logic level of the TTL IC circuit 7, which is 2.4■, so that the logic operation can be performed reliably.

〔発明の効果〕〔Effect of the invention〕

以上性べてきたように本発明によれば、TTL回路とC
MO3回路とのインタフェースをとるのに要する実装ス
ペースを削減し、その有効利用を図り得る。
As described above, according to the present invention, a TTL circuit and a C
The mounting space required for interfacing with the MO3 circuit can be reduced and used effectively.

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

第1図は本発明の原理図、 第2図は本発明の実施例の回路図、 第3図及び第4図は従来例の回路図である。 第1図、第2図において、 1は電源ライン、 2はアースライン、 3はTTLゲート回路、 4はCMOSゲート回路、 5.10はダイオード、 7はTTL−IC回路、 8はCMO3−IC回路である。 代理人弁理士 井桁貞−・−3入、・ −−!“′ 第2図 従来のD巨]】:匠tイシグリ 第 3 図 ! 第4図 Figure 1 is a diagram of the principle of the present invention. FIG. 2 is a circuit diagram of an embodiment of the present invention, 3 and 4 are circuit diagrams of conventional examples. In Figures 1 and 2, 1 is the power line, 2 is the earth line, 3 is a TTL gate circuit, 4 is a CMOS gate circuit, 5.10 is a diode, 7 is a TTL-IC circuit, 8 is a CMO3-IC circuit. Representative Patent Attorney Sada Igeta - 3rd year, - --! “′ Figure 2 Conventional D Giant】】: Takumi T Ishiguri Figure 3 ! Figure 4

Claims (2)

【特許請求の範囲】[Claims] (1)第1の論理回路(3)の論理レベル出力をその出
力論理レベルでは動作しないスレッシュホールドを有す
る第2の論理回路(4)へ供給するための回路において
、第2の論理回路(4)への給電を第1論理回路(3)
に接続された電源ラインに直列接続された単方向性素子
を介して行なうことを特徴とするインタフェース回路。
(1) In a circuit for supplying a logic level output of a first logic circuit (3) to a second logic circuit (4) having a threshold that does not operate at the output logic level, the second logic circuit (4) ) to the first logic circuit (3)
An interface circuit characterized in that the interface circuit operates through a unidirectional element connected in series to a power supply line connected to the interface circuit.
(2)第1の論理回路(3)及び第2の論理回路(4)
が夫々複数のTTLゲート回路(7)及び複数のCMO
Sゲート回路(8)より成り、前記複数のCMOSゲー
ト回路(8)への給電を前記複数のTTLゲート回路(
7)に接続された単一の電源ラインに直列接続された単
一のダイオードを介して行なうことを特徴とする特許請
求の範囲第1項記載のインタフェース回路。
(2) First logic circuit (3) and second logic circuit (4)
are a plurality of TTL gate circuits (7) and a plurality of CMOs, respectively.
The power is supplied to the plurality of CMOS gate circuits (8) by the plurality of TTL gate circuits (8).
7) The interface circuit according to claim 1, wherein the interface circuit is operated via a single diode connected in series to a single power supply line connected to the interface circuit.
JP60225236A 1985-10-09 1985-10-09 Interface circuit Pending JPS6284619A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60225236A JPS6284619A (en) 1985-10-09 1985-10-09 Interface circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60225236A JPS6284619A (en) 1985-10-09 1985-10-09 Interface circuit

Publications (1)

Publication Number Publication Date
JPS6284619A true JPS6284619A (en) 1987-04-18

Family

ID=16826124

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60225236A Pending JPS6284619A (en) 1985-10-09 1985-10-09 Interface circuit

Country Status (1)

Country Link
JP (1) JPS6284619A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63250417A (en) * 1987-04-08 1988-10-18 Nippon Steel Corp Manufacture of steel material excellent in resistance to stress corrosion cracking and having low yield ratio in sulfide-rich circumstances

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63250417A (en) * 1987-04-08 1988-10-18 Nippon Steel Corp Manufacture of steel material excellent in resistance to stress corrosion cracking and having low yield ratio in sulfide-rich circumstances

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