JPH01107171U - - Google Patents
Info
- Publication number
- JPH01107171U JPH01107171U JP58888U JP58888U JPH01107171U JP H01107171 U JPH01107171 U JP H01107171U JP 58888 U JP58888 U JP 58888U JP 58888 U JP58888 U JP 58888U JP H01107171 U JPH01107171 U JP H01107171U
- Authority
- JP
- Japan
- Prior art keywords
- input
- resistor
- input terminal
- input voltage
- level
- 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
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の第１実施例を示す回路図、第
２図は同実施例における基板上の具体的な実装例
を示す斜視図、第３図は本考案の第２実施例を示
す回路図、第４図は従来例を示す回路図、第５図
は同従来例における基板上の具体的な実装例を示
す斜視図である。
８……ＩＣ、９……入力端子、１０……中断部
、１１ａ，１１ｂ……端子、Ｒ２……抵抗、Ｒ３
……抵抗。
Fig. 1 is a circuit diagram showing a first embodiment of the invention, Fig. 2 is a perspective view showing a specific example of mounting the same embodiment on a board, and Fig. 3 shows a second embodiment of the invention. FIG. 4 is a circuit diagram showing a conventional example, and FIG. 5 is a perspective view showing a specific example of mounting on a board in the conventional example. 8...IC, 9...Input terminal, 10...Interruption part, 11a, 11b...Terminal, R2...Resistor, R3
……resistance.
Claims (1)
子と電源間に設けた中断部と、 該中断部を接続する接続部品とよりなり、 前記接続部品の装着の有無により入力を接続・
解放し、ＩＣへの入力電圧のレベルの高低を切り
換える入力切換回路において、 前記接続部品として、抵抗を用い、 該抵抗を装着して入力を接続したとき、ＩＣの
入力端子への入力電圧がＩＣの保有する入力高レ
ベルより高くなり、抵抗を装着しないで入力を解
放したときＩＣの入力端子への入力電圧がＩＣの
保有する入力低レベルより低くなるように設定し
、 抵抗の装着の有無により、ＩＣへの入力電圧の
レベルの高低を切り換えたことを特徴とする入力
切換回路。[Scope of claim for utility model registration] Consists of an interruption part provided between the input terminal of the IC and the ground or between the input terminal of the IC and the power supply, and a connecting part that connects the interruption part, and whether or not the said connecting part is installed. Connect the input by
In an input switching circuit that switches the level of the input voltage to the IC between high and low, a resistor is used as the connecting component, and when the resistor is installed and the input is connected, the input voltage to the input terminal of the IC is The input voltage to the IC's input terminal is set to be higher than the input high level held by the IC, and when the input is released without a resistor installed, the input voltage to the IC input terminal is lower than the input low level held by the IC, depending on whether a resistor is installed or not. , an input switching circuit characterized in that the level of input voltage to an IC is switched between high and low levels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58888U JPH01107171U (en) | 1988-01-08 | 1988-01-08 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58888U JPH01107171U (en) | 1988-01-08 | 1988-01-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01107171U true JPH01107171U (en) | 1989-07-19 |
Family
ID=31504529
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58888U Pending JPH01107171U (en) | 1988-01-08 | 1988-01-08 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01107171U (en) |
-
1988
- 1988-01-08 JP JP58888U patent/JPH01107171U/ja active Pending
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