JPS5478964A - Selection circuit - Google Patents
Selection circuitInfo
- Publication number
- JPS5478964A JPS5478964A JP14607577A JP14607577A JPS5478964A JP S5478964 A JPS5478964 A JP S5478964A JP 14607577 A JP14607577 A JP 14607577A JP 14607577 A JP14607577 A JP 14607577A JP S5478964 A JPS5478964 A JP S5478964A
- Authority
- JP
- Japan
- Prior art keywords
- logic
- terminal
- leads
- turned
- selection
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16557—Logic probes, i.e. circuits indicating logic state (high, low, O)
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
Abstract
PURPOSE:To reduce the number of input terminals for the integrated circuit, by providing the switch element where the control terminal is connected to the input terminal fed and selected with three different voltages of high, medium and low, and the switch element controlled with the voltage fed to the input terminal. CONSTITUTION:When the common terminal 25 of the selection switch 21 is connected to the selection terminal 22, transistor Tr26 is turned off and Tr27 is turned on, and only the logic of the leads 15 of the logic circuit of the integrated circuit 19 is at H and the logic of the leads 16 and 17 is at L. When the common terminal 25 is connected to the selection terminal 23, Tr26 and 27 are turned on an they are both in saturation, and the logic of the leads 15 and 17 is at L, and only the logic of the lead 16 is at H. When the common terminal 25 is connected to the selection terminal 24, Tr26 is turned on and Tr27 is turned off, the logic of the leads 15 and 16 is at L, and only the logic of the leads 17 is at H. Thus, the selection circuit of three stages can be constituted with one input terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14607577A JPS5478964A (en) | 1977-12-07 | 1977-12-07 | Selection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14607577A JPS5478964A (en) | 1977-12-07 | 1977-12-07 | Selection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5478964A true JPS5478964A (en) | 1979-06-23 |
Family
ID=15399527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14607577A Pending JPS5478964A (en) | 1977-12-07 | 1977-12-07 | Selection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5478964A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5746323U (en) * | 1980-08-28 | 1982-03-15 | ||
| JPS5857821A (en) * | 1981-10-01 | 1983-04-06 | Matsushita Electric Ind Co Ltd | Switch circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4015254A (en) * | 1975-12-04 | 1977-03-29 | General Motors Corporation | Keyboard encoding circuit utilizing an A/D converter |
-
1977
- 1977-12-07 JP JP14607577A patent/JPS5478964A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4015254A (en) * | 1975-12-04 | 1977-03-29 | General Motors Corporation | Keyboard encoding circuit utilizing an A/D converter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5746323U (en) * | 1980-08-28 | 1982-03-15 | ||
| JPS5857821A (en) * | 1981-10-01 | 1983-04-06 | Matsushita Electric Ind Co Ltd | Switch circuit |
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