JPS54134549A - Logical operation circuit - Google Patents

Logical operation circuit

Info

Publication number
JPS54134549A
JPS54134549A JP4251578A JP4251578A JPS54134549A JP S54134549 A JPS54134549 A JP S54134549A JP 4251578 A JP4251578 A JP 4251578A JP 4251578 A JP4251578 A JP 4251578A JP S54134549 A JPS54134549 A JP S54134549A
Authority
JP
Japan
Prior art keywords
turning
turned
base
state
diode
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
JP4251578A
Other languages
Japanese (ja)
Inventor
Katsuharu Mitono
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 JP4251578A priority Critical patent/JPS54134549A/en
Publication of JPS54134549A publication Critical patent/JPS54134549A/en
Pending 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
    • H03K19/01—Modifications for accelerating switching
    • H03K19/013—Modifications for accelerating switching in bipolar transistor circuits
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Logic Circuits (AREA)

Abstract

PURPOSE:To improve the operation speed of the logical operation circuit in a simple constitution. CONSTITUTION:Diode D2 is connected between input terminal IN and the emitter of transistor Q1, namely, the base of Q4 and can be made of a Schottky diode. When terminal IN is switched to a low level from a high level, Q4 is turned off from a turning-on state since Q1 is turned off from a turning-on state. At this time, since the accumulated charge of the base of Q4 is emitted through diode D2, the turning-off of Q4 can be made high-speed. Meanwhile, when terminal IN is switched to a high level from a low level, Q1 is turned on from a turning-off state, and Q4 is turned on from a turning-off state similarly. At this time, the potential change from the low level to the high level at terminal IN is applied to the base of Q4 through the capacity of diode D2, so that the base potential of Q4 rises rapidly and the turning-on of Q4 can be made high-speed.
JP4251578A 1978-04-10 1978-04-10 Logical operation circuit Pending JPS54134549A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4251578A JPS54134549A (en) 1978-04-10 1978-04-10 Logical operation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4251578A JPS54134549A (en) 1978-04-10 1978-04-10 Logical operation circuit

Publications (1)

Publication Number Publication Date
JPS54134549A true JPS54134549A (en) 1979-10-19

Family

ID=12638199

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4251578A Pending JPS54134549A (en) 1978-04-10 1978-04-10 Logical operation circuit

Country Status (1)

Country Link
JP (1) JPS54134549A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54156463A (en) * 1978-05-30 1979-12-10 Nec Corp Logic circuit
JPS5830233A (en) * 1981-08-17 1983-02-22 Fujitsu Ltd Transistor circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54156463A (en) * 1978-05-30 1979-12-10 Nec Corp Logic circuit
JPS5830233A (en) * 1981-08-17 1983-02-22 Fujitsu Ltd Transistor circuit

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