JPS57157626A - Decoder circuit - Google Patents

Decoder circuit

Info

Publication number
JPS57157626A
JPS57157626A JP56042216A JP4221681A JPS57157626A JP S57157626 A JPS57157626 A JP S57157626A JP 56042216 A JP56042216 A JP 56042216A JP 4221681 A JP4221681 A JP 4221681A JP S57157626 A JPS57157626 A JP S57157626A
Authority
JP
Japan
Prior art keywords
decoder circuit
gate
vcc
diode
power source
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
JP56042216A
Other languages
Japanese (ja)
Inventor
Koji Ueno
Toshitaka Fukushima
Tamio Miyamura
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 JP56042216A priority Critical patent/JPS57157626A/en
Publication of JPS57157626A publication Critical patent/JPS57157626A/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
    • H03K19/02—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components
    • H03K19/08—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices
    • H03K19/082—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits using specified components using semiconductor devices using bipolar transistors
    • H03K19/088—Transistor-transistor logic

Landscapes

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

Abstract

PURPOSE:To reduce the power consumption of the titled circuit without reducing the operation speed, by connecting a level shifting means between the power source and the logical gate in the TTL type or DTL type decoder circuit. CONSTITUTION:A diode 10 is inserted between a resistance 2 and a power source VCC as a level shifting element and connected to them. When this decoder circuit having an AND gate composed of a multiemitter transistor 1 is not selected, the electric current (I) flowing from the power source VCC to the input side of the AND gate becomes I=(VCC-VT-VD-VIN)/R, where VCC is the supply voltage, VT is the voltage across the base and the emitter of the multiemitter transistor 1, VD is the forward voltage of the diode 10, VIN is the input signal level of the AND gate, and R is the value of the resistance 2. Therefore, the electric current I becomes smaller because the forward voltage VD of the diode 10 for level shifting exists, and thus, power consumption at the time when the decoder circuit is not selected can be reduced.
JP56042216A 1981-03-23 1981-03-23 Decoder circuit Pending JPS57157626A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56042216A JPS57157626A (en) 1981-03-23 1981-03-23 Decoder circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56042216A JPS57157626A (en) 1981-03-23 1981-03-23 Decoder circuit

Publications (1)

Publication Number Publication Date
JPS57157626A true JPS57157626A (en) 1982-09-29

Family

ID=12629836

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56042216A Pending JPS57157626A (en) 1981-03-23 1981-03-23 Decoder circuit

Country Status (1)

Country Link
JP (1) JPS57157626A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6425623A (en) * 1987-07-22 1989-01-27 Nippon Electric Ic Microcomput Logic circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5349936A (en) * 1976-10-18 1978-05-06 Fujitsu Ltd Switching circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5349936A (en) * 1976-10-18 1978-05-06 Fujitsu Ltd Switching circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6425623A (en) * 1987-07-22 1989-01-27 Nippon Electric Ic Microcomput Logic circuit

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