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output circuit

A technology of output circuit and clamping circuit, which is applied in the direction of logic circuit, logic circuit connection/interface layout, electrical components, etc., can solve the problems of limiting the application range of output circuit, and achieve the effect of improving the scope and expanding the application scope

Active Publication Date: 2021-08-06
SHANGHAI FUDAN MICROELECTRONICS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the output circuit in the existing input-output circuit is limited by the withstand voltage condition of the port device, so that the maximum value of the output voltage of the output circuit can only reach the withstand voltage value of the port device, which limits the application of the output circuit. scope

Method used

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Embodiment Construction

[0020] In order to solve the above-mentioned problems existing in the prior art, the technical solution adopted in the embodiment of the present invention, through the setting of the clamping circuit unit, can equalize the device port voltage of the output drive circuit when the port power supply voltage of the output circuit is greater than the auxiliary power supply voltage. The I / O devices of the output drive circuit can be effectively protected within the corresponding withstand voltage value of the device, and the range of the output voltage of the output circuit can be increased, thereby expanding the application range of the output circuit.

[0021] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] For ease of understanding, a brief description of the power supplies used in the foll...

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PUM

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Abstract

An output circuit, the circuit comprising: a clamping circuit unit, an output buffer unit, and an output driving unit; the output driving unit is respectively coupled to the clamping circuit unit and the output buffering unit; the clamping circuit unit, It is adapted to clamp the port voltage of the output drive unit within a corresponding withstand voltage value of the device when it is determined that the port power supply voltage of the output circuit is greater than a preset auxiliary power supply voltage. The above solution can increase the output voltage range of the output circuit and expand the application range of the output circuit.

Description

technical field [0001] The invention relates to the technical field of circuits, in particular to an output circuit. Background technique [0002] Input and output (I / O) circuits, composed of input circuits and output circuits, are usually used to convert voltage swing signals from external circuits into digital signals that can be recognized by integrated circuits; or convert internal signals of the chip into external devices through ports Recognizable level signal. [0003] However, the output circuit in the existing input-output circuit is limited by the withstand voltage condition of the port device, so that the maximum value of the output voltage of the output circuit can only reach the withstand voltage value of the port device, which limits the application of the output circuit. scope. Contents of the invention [0004] The problem solved by the embodiments of the present invention is how to increase the output voltage range of the output circuit and expand the ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/0185
CPCH03K19/018507
Inventor 刘跃智沈磊方刘禄黄月娥张伟国
Owner SHANGHAI FUDAN MICROELECTRONICS GROUP