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Bidirectional interface circuit

A technology of interface circuit and bidirectional port, which is applied in the field of data transmission, can solve problems such as overvoltage, large leakage current, and leakage of bidirectional interface circuit, and achieve the effect of reducing leakage current and improving robustness

Pending Publication Date: 2017-11-24
SHANGRUI MICROELECTRONICS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are two main problems in the common bidirectional interface circuit. First, when the circuit is outputting, the leakage current of the output transistor is very large when the state is reversed; in addition, when the voltage of the input and output ports is higher than the power supply voltage, Will cause overvoltage and leakage of bidirectional interface circuit

Method used

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Embodiment Construction

[0045] In the embodiment of the present invention, the bidirectional interface circuit includes a first transmission circuit, a second transmission circuit, a first drive circuit, and a third transmission circuit; when the enable signal is in the first level state, the first transmission circuit and the The second transmission circuit delays and inverts the received first signal, and outputs the second signal and the third signal obtained based on the first signal, and the second signal changes from the first level state to the second signal In the two-level state, the transition from the first level state to the second level state lags behind the third signal, and when the third signal transitions from the second level state to the first level state, it lags behind the The second signal changes from the second level state to the first level state.

[0046] The first drive circuit receives the second signal and the third signal, and outputs a fourth signal at a bidirectional p...

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Abstract

The invention discloses a bidirectional interface circuit, which comprises a first transmission circuit, a second transmission circuit, a first drive circuit and a third transmission circuit. When an enable signal is in a first level state, the first transmission circuit carries out time delay and phase reversal on a received first signal and then, outputs a second signal; the second transmission circuit carries out time delay and phase reversal on the received first signal, and then, outputs a third signal; the first drive circuit receives the second signal and the third signal, and outputs a fourth signal from a bidirectional interface based on the second signal and the third signal; and when the enable signal is in a second level state, the third transmission circuit receives a fifth signal from the bidirectional interface and outputs a sixth signal based on the fifth signal.

Description

technical field [0001] The invention relates to data transmission technology in the field of integrated circuits, in particular to a bidirectional interface circuit. Background technique [0002] Half-duplex transmission refers to a transmission mode in which receiving and sending share a transmission channel, but only data can be sent or received at the same time. Full-duplex transmission, on the other hand, refers to a type of data transmission that occurs in both directions simultaneously. For example: a walkie-talkie is a half-duplex device that allows only one party to speak at the same time. A telephone, by contrast, is a full-duplex device in which both parties to the conversation can converse at the same time. [0003] In chip design, bidirectional interface circuits are usually used for half-duplex data transmission, and time-division multiplexing is performed through input interfaces and output interfaces, which can effectively reduce the number of chip input and...

Claims

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Application Information

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IPC IPC(8): H03K19/0175H03K19/018H03K19/0185
CPCH03K19/017509H03K19/01759H03K19/01806H03K19/01843H03K19/018507H03K19/018592
Inventor 王鑫苏强彭振飞
Owner SHANGRUI MICROELECTRONICS SHANGHAI
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