CN204316478U - Transistor-Transistor Logic level serial ports switching circuit - Google Patents
Transistor-Transistor Logic level serial ports switching circuit Download PDFInfo
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- CN204316478U CN204316478U CN201420722905.5U CN201420722905U CN204316478U CN 204316478 U CN204316478 U CN 204316478U CN 201420722905 U CN201420722905 U CN 201420722905U CN 204316478 U CN204316478 U CN 204316478U
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Abstract
A kind of Transistor-Transistor Logic level serial ports switching circuit, comprises the first resistance R1, the second resistance R2, the 3rd resistance R3, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, the 5th triode Q5; Concrete annexation is: serial ports TXIN end is held with serial ports TXOUT and is connected with the second triode Q2 and the 3rd triode Q3 in turn; Serial ports RXIN end is held with serial ports RXOUT and is connected with the first triode Q1 and the 4th triode Q4 in turn.The beneficial effects of the utility model are: circuit structure is reasonable, and overall price/performance ratio is high, are controlled connection and the disconnection of serial port circuit signal by switching circuit.
Description
Technical field
The present invention relates to switching circuit field, especially a kind of Transistor-Transistor Logic level serial ports switching circuit.
Background technology
The switching circuit majority circuit complex structure be applicable in serial ports of the prior art, electronic devices and components used are more, and cost performance is low, and the connection controlling rs 232 serial interface signal is not accurate with disconnection.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of circuit structure reasonable, the Transistor-Transistor Logic level serial ports switching circuit that cost performance is high, is controlled connection and the disconnection of serial port circuit signal by switching circuit.
For solving the problems of the technologies described above, the invention provides a kind of Transistor-Transistor Logic level serial ports switching circuit, comprise the first resistance R1, the second resistance R2, the 3rd resistance R3, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, the 5th triode Q5; Concrete annexation is: serial ports TXIN end is held with serial ports TXOUT and is connected with the second triode Q2 and the 3rd triode Q3 in turn; Serial ports RXIN end is held with serial ports RXOUT and is connected with the first triode Q1 and the 4th triode Q4 in turn; First resistance R1 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the source electrode of the first triode Q1 and the source electrode of the 4th triode Q4; Second resistance R2 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the source electrode of the second triode Q2 and the source electrode of the 3rd triode Q3; 3rd resistance R3 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the drain electrode of the 4th triode Q4 and serial ports RXOUT hold; The base stage of the 5th triode Q5 connects CONTROL end, and grounded emitter, collector electrode is connected in the middle of the grid of the first triode Q1 and the grid of the 4th triode Q4.
Preferably, the first resistance R1, the second resistance R2, the 3rd resistance R3 are the pull-up resistor of high level.
Preferably, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4 are N-MOS pipe, and the 5th triode Q5 is NPN triode.
Beneficial effect of the present invention is: circuit structure is reasonable, and overall price/performance ratio is high, is controlled connection and the disconnection of serial port circuit signal by switching circuit.
Accompanying drawing explanation
Fig. 1 is integrated circuit figure of the present invention.
Embodiment
For solving the problems of the technologies described above, the invention provides a kind of Transistor-Transistor Logic level serial ports switching circuit, comprise the first resistance R1, the second resistance R2, the 3rd resistance R3, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, the 5th triode Q5; Concrete annexation is: serial ports TXIN end is held with serial ports TXOUT and is connected with the second triode Q2 and the 3rd triode Q3 in turn; Serial ports RXIN end is held with serial ports RXOUT and is connected with the first triode Q1 and the 4th triode Q4 in turn; First resistance R1 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the source electrode of the first triode Q1 and the source electrode of the 4th triode Q4; Second resistance R2 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the source electrode of the second triode Q2 and the source electrode of the 3rd triode Q3; 3rd resistance R3 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the drain electrode of the 4th triode Q4 and serial ports RXOUT hold; The base stage of the 5th triode Q5 connects CONTROL end, and grounded emitter, collector electrode is connected in the middle of the grid of the first triode Q1 and the grid of the 4th triode Q4.
First resistance R1, the second resistance R2, the 3rd resistance R3 are the pull-up resistor of high level.First triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4 are N-MOS pipe, and the 5th triode Q5 is NPN triode.
When CONTROL end provides high level signal, the 5th triode Q5 saturation conduction, current collection is low level very, and the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4 end, and circuit disconnects.When CONTROL end provides low level signal, 5th triode Q5 ends, current collection is high level very, when serial ports RXIN or TXIN provides low level signal, the source electrode of the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4 is low level, all be in conducting state, low level signal can be transferred to RXOUT or TXOUT end, complete whole switching process.
Although the present invention illustrates with regard to preferred implementation and describes, only it will be understood by those of skill in the art that otherwise exceed claim limited range of the present invention, variations and modifications can be carried out to the present invention.
Claims (3)
1. a Transistor-Transistor Logic level serial ports switching circuit, is characterized in that, comprising: the first resistance R1, the second resistance R2, the 3rd resistance R3, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4, the 5th triode Q5; Concrete annexation is: serial ports TXIN end is held with serial ports TXOUT and is connected with the second triode Q2 and the 3rd triode Q3 in turn; Serial ports RXIN end is held with serial ports RXOUT and is connected with the first triode Q1 and the 4th triode Q4 in turn; First resistance R1 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the source electrode of the first triode Q1 and the source electrode of the 4th triode Q4; Second resistance R2 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the source electrode of the second triode Q2 and the source electrode of the 3rd triode Q3; 3rd resistance R3 one end is connected to 3.3V voltage end, and the other end is connected in the middle of the drain electrode of the 4th triode Q4 and serial ports RXOUT hold; The base stage of the 5th triode Q5 connects CONTROL end, and grounded emitter, collector electrode is connected in the middle of the grid of the first triode Q1 and the grid of the 4th triode Q4.
2. Transistor-Transistor Logic level serial ports switching circuit as claimed in claim 1, it is characterized in that, the first resistance R1, the second resistance R2, the 3rd resistance R3 are the pull-up resistor of high level.
3. Transistor-Transistor Logic level serial ports switching circuit as claimed in claim 1, is characterized in that, the first triode Q1, the second triode Q2, the 3rd triode Q3, the 4th triode Q4 are N-MOS pipe, and the 5th triode Q5 is NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420722905.5U CN204316478U (en) | 2014-11-27 | 2014-11-27 | Transistor-Transistor Logic level serial ports switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420722905.5U CN204316478U (en) | 2014-11-27 | 2014-11-27 | Transistor-Transistor Logic level serial ports switching circuit |
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| Publication Number | Publication Date |
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| CN204316478U true CN204316478U (en) | 2015-05-06 |
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| CN201420722905.5U Active CN204316478U (en) | 2014-11-27 | 2014-11-27 | Transistor-Transistor Logic level serial ports switching circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224693A (en) * | 2018-03-02 | 2019-09-10 | 中科院微电子研究所昆山分所 | A kind of leakage current protection circuit |
-
2014
- 2014-11-27 CN CN201420722905.5U patent/CN204316478U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110224693A (en) * | 2018-03-02 | 2019-09-10 | 中科院微电子研究所昆山分所 | A kind of leakage current protection circuit |
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Address after: 210000, Jiangsu, Qixia Province, Nanjing District, Gan family, East, No. 108, a layer Patentee after: Jiangsu Austen photoelectric Polytron Technologies Inc Address before: 210000, Jiangsu, Qixia Province, Nanjing District, Gan family, East, No. 108, a layer Patentee before: JIANGSU AUSTIN OPTRONICS TECHNOLOGY Co.,Ltd. |