JPS62133435U - - Google Patents
Info
- Publication number
- JPS62133435U JPS62133435U JP2128186U JP2128186U JPS62133435U JP S62133435 U JPS62133435 U JP S62133435U JP 2128186 U JP2128186 U JP 2128186U JP 2128186 U JP2128186 U JP 2128186U JP S62133435 U JPS62133435 U JP S62133435U
- Authority
- JP
- Japan
- Prior art keywords
- input
- switch
- signal
- pin
- output
- 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
Links
- 238000006243 chemical reaction Methods 0.000 claims 2
- 239000003990 capacitor Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は、本考案の一実施例を示す回路図、及
び第２図は従来の信号切換回路を示す回路図であ
る。
９……入力ピン、１１……コンパレータ、１３
……トランジスタ、１４……第１スイツチ、１５
……電源回路、１８……出力ピン、２１……出力
端子、２２……第２入力端子、２４……第２スイ
ツチ。
FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional signal switching circuit. 9...Input pin, 11...Comparator, 13
...Transistor, 14...First switch, 15
...Power supply circuit, 18...Output pin, 21...Output terminal, 22...Second input terminal, 24...Second switch.
Claims (1)
１入力信号を低インピーダンスで出力するインピ
ーダンス変換回路と、該インピーダンス変換回路
の出力信号を遮断する第１スイツチと、該第１ス
イツチの出力側に接続される出力ピンと、前記入
力ピンに直流電圧を印加する電源回路と、前記入
力ピンの電圧と基準電圧とを比較し、前記第１ス
イツチを制御するコンパレータとを有する集積回
路と、第２入力信号が印加される入力端子と、前
記入力端子に抵抗を介して接続される出力端子と
、前記出力ピンと前記出力端子との間に接続され
るコンデンサ、及び前記入力ピンに接続される第
２スイツチとから成り、前記第２スイツチの制御
に応じて前記第１スイツチを閉成することにより
、前記第１入力信号を前記出力端子に導出させ、
前記第１スイツチを開放することにより前記第２
入力信号を前記出力端子に導出させることを特徴
とする信号切換回路。 an input pin to which a first input signal is applied; an impedance conversion circuit that outputs the first input signal at low impedance; a first switch that cuts off the output signal of the impedance conversion circuit; an integrated circuit having an output pin to be connected, a power supply circuit that applies a DC voltage to the input pin, a comparator that compares the voltage of the input pin with a reference voltage and controls the first switch; and a second input. an input terminal to which a signal is applied, an output terminal connected to the input terminal via a resistor, a capacitor connected between the output pin and the output terminal, and a second switch connected to the input pin. and, by closing the first switch in accordance with the control of the second switch, the first input signal is led out to the output terminal;
By opening the first switch, the second
A signal switching circuit characterized in that an input signal is led out to the output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2128186U JPH0317477Y2 (en) | 1986-02-17 | 1986-02-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2128186U JPH0317477Y2 (en) | 1986-02-17 | 1986-02-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62133435U true JPS62133435U (en) | 1987-08-22 |
| JPH0317477Y2 JPH0317477Y2 (en) | 1991-04-12 |
Family
ID=30817577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2128186U Expired JPH0317477Y2 (en) | 1986-02-17 | 1986-02-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0317477Y2 (en) |
-
1986
- 1986-02-17 JP JP2128186U patent/JPH0317477Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0317477Y2 (en) | 1991-04-12 |