JPS6464528A - Output voltage switching circuit - Google Patents

Output voltage switching circuit

Info

Publication number
JPS6464528A
JPS6464528A JP62221511A JP22151187A JPS6464528A JP S6464528 A JPS6464528 A JP S6464528A JP 62221511 A JP62221511 A JP 62221511A JP 22151187 A JP22151187 A JP 22151187A JP S6464528 A JPS6464528 A JP S6464528A
Authority
JP
Japan
Prior art keywords
input voltage
external input
fed
circuit
switching
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
JP62221511A
Other languages
Japanese (ja)
Inventor
Koji Shinohara
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 JP62221511A priority Critical patent/JPS6464528A/en
Publication of JPS6464528A publication Critical patent/JPS6464528A/en
Pending legal-status Critical Current

Links

Landscapes

  • Direct Current Feeding And Distribution (AREA)

Abstract

PURPOSE:To eliminate a terminal for a switching control signal being fed from the outside, by switching an internal input voltage being fed from an internal power source circuit to an external input voltage corresponding to the input level of the external input voltage then feeding it to an integrated circuit. CONSTITUTION:When an external input voltage is not fed from a terminal 51, an internal input voltage provided from a power source circuit 3 is fed through a switching circuit 4 into an integrated circuit. Upon provision of the external input voltage through the terminal 51, a comparison circuit 1 compares the external input voltage with a reference voltage fed from a reference voltage source 2, and if the external input voltage is higher than the reference voltage, a switch control signal is fed from the comparison circuit 1 to a switching circuit 4 which switches and selects the external input voltage and feeds the selected external input voltage into the integrated circuit. If the external input voltage is lower than the reference voltage, the internal input voltage is fed through the switching circuit 4 into the integrated circuit. Consequently, no terminal for receiving the external switching control signal is required.
JP62221511A 1987-09-03 1987-09-03 Output voltage switching circuit Pending JPS6464528A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62221511A JPS6464528A (en) 1987-09-03 1987-09-03 Output voltage switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62221511A JPS6464528A (en) 1987-09-03 1987-09-03 Output voltage switching circuit

Publications (1)

Publication Number Publication Date
JPS6464528A true JPS6464528A (en) 1989-03-10

Family

ID=16767860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62221511A Pending JPS6464528A (en) 1987-09-03 1987-09-03 Output voltage switching circuit

Country Status (1)

Country Link
JP (1) JPS6464528A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142774A (en) * 1991-05-30 1992-09-01 Huck Manufacturing Co. Apparatus and method for loading fastener collars onto a mandrel
US5226228A (en) * 1989-11-15 1993-07-13 Yoshitaka Aoyama Part feeding apparatus
KR100399983B1 (en) * 2001-06-05 2003-09-29 (주)에스피에스 Analog de-multiplexer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6016234B2 (en) * 1978-02-02 1985-04-24 旭化成工業株式会社 Method for producing biologically active substances

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6016234B2 (en) * 1978-02-02 1985-04-24 旭化成工業株式会社 Method for producing biologically active substances

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5226228A (en) * 1989-11-15 1993-07-13 Yoshitaka Aoyama Part feeding apparatus
US5142774A (en) * 1991-05-30 1992-09-01 Huck Manufacturing Co. Apparatus and method for loading fastener collars onto a mandrel
KR100399983B1 (en) * 2001-06-05 2003-09-29 (주)에스피에스 Analog de-multiplexer

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