JPS6464528A - Output voltage switching circuit - Google Patents
Output voltage switching circuitInfo
- 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
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.
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)
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)
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 |
-
1987
- 1987-09-03 JP JP62221511A patent/JPS6464528A/en active Pending
Patent Citations (1)
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)
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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