JPS6429115A - Interface circuit - Google Patents

Interface circuit

Info

Publication number
JPS6429115A
JPS6429115A JP62185905A JP18590587A JPS6429115A JP S6429115 A JPS6429115 A JP S6429115A JP 62185905 A JP62185905 A JP 62185905A JP 18590587 A JP18590587 A JP 18590587A JP S6429115 A JPS6429115 A JP S6429115A
Authority
JP
Japan
Prior art keywords
current
resistor
circuit
mirror circuit
current mirror
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
JP62185905A
Other languages
Japanese (ja)
Other versions
JPH0777341B2 (en
Inventor
Eiji Shinozaki
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 JP62185905A priority Critical patent/JPH0777341B2/en
Publication of JPS6429115A publication Critical patent/JPS6429115A/en
Publication of JPH0777341B2 publication Critical patent/JPH0777341B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Electronic Switches (AREA)
  • Logic Circuits (AREA)

Abstract

PURPOSE:To reduce the occupied area of an interface circuit in a semiconductor chip by adopting the circuit constitution that a constant current formed by using a resistor is supplied as the operating current of a MOS transistor(TR) while utilizing a current mirror circuit. CONSTITUTION:An output current of a constant current circuit comprising PMOS TRs 4, 6a, 6b being components of the current mirror circuit and a resistor 5 is fed as an operating current of PMOS TRs 7a, 7b receiving input signals VIN1,VIN2. Since a prescribed current is formed by the current mirror circuit in this way, it is not required to provide a current limit resistor individually to the base of the NPN TRs 8a, 8b. Moreover, the resistance of the resistor 5 to produce a reference current of the current mirror circuit is smaller enough to be a resistance of the current limit resistor and then considerable occupied area reduction is attained.
JP62185905A 1987-07-24 1987-07-24 Interface circuit Expired - Lifetime JPH0777341B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62185905A JPH0777341B2 (en) 1987-07-24 1987-07-24 Interface circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62185905A JPH0777341B2 (en) 1987-07-24 1987-07-24 Interface circuit

Publications (2)

Publication Number Publication Date
JPS6429115A true JPS6429115A (en) 1989-01-31
JPH0777341B2 JPH0777341B2 (en) 1995-08-16

Family

ID=16178934

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62185905A Expired - Lifetime JPH0777341B2 (en) 1987-07-24 1987-07-24 Interface circuit

Country Status (1)

Country Link
JP (1) JPH0777341B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61296820A (en) * 1985-06-25 1986-12-27 Toshiba Corp Current mirror circuit for switch

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61296820A (en) * 1985-06-25 1986-12-27 Toshiba Corp Current mirror circuit for switch

Also Published As

Publication number Publication date
JPH0777341B2 (en) 1995-08-16

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