JPS56119531A - Level converting circuit - Google Patents

Level converting circuit

Info

Publication number
JPS56119531A
JPS56119531A JP2306080A JP2306080A JPS56119531A JP S56119531 A JPS56119531 A JP S56119531A JP 2306080 A JP2306080 A JP 2306080A JP 2306080 A JP2306080 A JP 2306080A JP S56119531 A JPS56119531 A JP S56119531A
Authority
JP
Japan
Prior art keywords
transistor
output
circuit
short
current
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.)
Granted
Application number
JP2306080A
Other languages
Japanese (ja)
Other versions
JPH0359609B2 (en
Inventor
Masayuki Komon
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 JP2306080A priority Critical patent/JPS56119531A/en
Publication of JPS56119531A publication Critical patent/JPS56119531A/en
Publication of JPH0359609B2 publication Critical patent/JPH0359609B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/0175—Coupling arrangements; Interface arrangements
    • H03K19/018—Coupling arrangements; Interface arrangements using bipolar transistors only
    • H03K19/01806—Interface arrangements
    • H03K19/01812—Interface arrangements with at least one differential stage
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/003—Modifications for increasing the reliability for protection
    • H03K19/00307—Modifications for increasing the reliability for protection in bipolar transistor circuits

Abstract

PURPOSE:To prevent the element destruction due to the short-circuit accident of the output stage with a simple circuit constitution, by driving the transistor of the output short-circuit protecting circuit directly by the output of the current switch. CONSTITUTION:When input VIN of the current mode logic CML mode becomes H, transistor T1 is turned on, and output VOUT of transistor logic TTL becomes H. Therefore, voltage VX of the voltage division ratio of bias circuit 4 is applied to the base of transistor T4. Meanwhile, when output terminal 2 is short-circuited to earth potential GND, the controller current of transistor T4 is supplied through the path of power source +VCC-resistance R1-transistor T4, and the base current of transistor T3 is reduced rapidly and cannot hold the turn-on state. As a result, transistor T3 is prevented from being destructed thermally.
JP2306080A 1980-02-26 1980-02-26 Level converting circuit Granted JPS56119531A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2306080A JPS56119531A (en) 1980-02-26 1980-02-26 Level converting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2306080A JPS56119531A (en) 1980-02-26 1980-02-26 Level converting circuit

Publications (2)

Publication Number Publication Date
JPS56119531A true JPS56119531A (en) 1981-09-19
JPH0359609B2 JPH0359609B2 (en) 1991-09-11

Family

ID=12099878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2306080A Granted JPS56119531A (en) 1980-02-26 1980-02-26 Level converting circuit

Country Status (1)

Country Link
JP (1) JPS56119531A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131227A (en) * 1982-12-27 1984-07-28 Sony Tektronix Corp Logical signal converting circuit
JPH03248619A (en) * 1990-02-27 1991-11-06 Nec Corp Semiconductor output circuit
JPH04282915A (en) * 1991-03-12 1992-10-08 Nec Corp Level conversion circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59131227A (en) * 1982-12-27 1984-07-28 Sony Tektronix Corp Logical signal converting circuit
JPH0356023B2 (en) * 1982-12-27 1991-08-27
JPH03248619A (en) * 1990-02-27 1991-11-06 Nec Corp Semiconductor output circuit
JPH04282915A (en) * 1991-03-12 1992-10-08 Nec Corp Level conversion circuit

Also Published As

Publication number Publication date
JPH0359609B2 (en) 1991-09-11

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