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Input and output circuits and circuitry

A technology of input and output circuits and output terminals, which is applied in the direction of logic circuit connection/interface layout, logic circuit coupling/interface using field effect transistors, etc., can solve problems such as complex structure and large power consumption, and achieve power-down protection and avoid Power consumption, the effect of avoiding damage to the circuit system

Active Publication Date: 2021-05-11
坤元微电子(南京)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, the structure is complicated, and it needs to provide power for the voltage detection circuit all the time, and the power consumption is relatively large.

Method used

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  • Input and output circuits and circuitry
  • Input and output circuits and circuitry
  • Input and output circuits and circuitry

Examples

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Embodiment Construction

[0030] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings but not all structures.

[0031] figure 1 A schematic structural diagram of an I / O circuit provided by the prior art. Such as figure 1As shown, the I / O circuit includes a first inverter 101, a NOR gate 102, a second inverter 103, a first driving transistor MP1, a third inverter 104, a NAND gate 105, a fourth inverter device 106 and the second driving transistor MN1. The power input terminals of the first inverter 101, the NOR gate 102, the second inverter 103, the third inverter 104, the NAND gate 105 and the fourth inverter 106 are all...

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Abstract

The invention discloses an input and output circuit and a circuit system. The second input end of the first inverting unit of the input-output circuit is connected to the first end of the bias unit, the output end of the first inverting unit is connected to the control end of the first output unit, and the input end of the first output unit Connected to the power signal input end, the first output end of the first output unit is connected to the first end of the bias unit, the second output end of the first output unit and the output end of the second output unit are used as the output end of the input-output circuit , the second terminal of the bias unit is connected to the power signal input terminal, the third terminal of the bias unit is connected to the output terminal of the input-output circuit, the fourth terminal of the bias unit is connected to the ground terminal, and the bias unit is used for power supply The first output unit is biased when the power signal provided by the signal input terminal is equal to zero. The power-down protection of the input and output circuits can be realized without increasing power consumption, and at the same time, the probability of damage to the circuit system is reduced.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of circuit protection, in particular to an input and output circuit and a circuit system. Background technique [0002] In the circuit system, it often happens that the external signal is powered on before the power signal. For example, when other circuits connected to the input / output (I / O) circuit in the circuit system start to work normally, an external signal will be provided to the output port of the I / O circuit. Or the driven port has a PULL-UP structure. At this time, the external signal or the driven port will leak back to the power supply in the circuit system through the driving transistor of the I / O circuit or the electrostatic protection structure, resulting in abnormal power-up of the circuit system or Functional errors may even burn the circuit system. [0003] In the prior art, a current detection circuit can be provided in the circuit system. When the current detec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0185
CPCH03K19/0185
Inventor 张昊
Owner 坤元微电子(南京)有限公司
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