Reset circuit

A reset circuit and branch circuit technology, which is applied in the direction of electrical components, electronic switches, pulse technology, etc., can solve the problems of data loss, data loss, and errors in storage units, and achieve low cost and power consumption, low power consumption and cost, Avoid the effect of mistakes

Active Publication Date: 2010-10-27
GIGADEVICE SEMICON (BEIJING) INC
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  • Abstract
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  • Claims
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Problems solved by technology

However, in reality, there are also many error states that occur during the power supply voltage drop process. For example, when the power supply voltage is very low (usually around the threshold voltage), the internal circuits of the chip are in the off state, and many memory cells will lose data; or For example, when the power supply suddenly fluctuates greatly during normal operation, and the instantaneous voltage is lower than the threshold voltage, data will be lost, and when the power supply returns to normal, an error will occur

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Embodiment Construction

[0027] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] In the prior art, the POR circuit will be turned off after being powered on, and usually does not have a power-off reset function. The reason is that the realization of the power-off reset function needs to increase the power-off detection circuit, which will lead to an increase in area; and this power-off detection circuit will trigger and generate a reset signal when the power supply voltage drops to the threshold voltage of the MOS tube. , but in practice, when the power supply voltage drops to the threshold voltage of the MOS tube, some internal circuits are already in an unstable state, and it is meaningless to generate a reset signal at this time.

[0029] Based on the above reasons, many researches and innovations of...

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Abstract

The invention discloses a reset circuit, which comprises an MOS tube branch which is connected between a power supply and the ground and an inverter branch which is connected with the MOS tube branch through a partial pressure connection point, wherein the inverter branch comprises an inverter which is used for triggering voltage signal lower than the overturn voltage thereof and generating a reset signal; and the reset circuit further comprises an impedance component which is connected with the MOS tube branch and is used for reducing the voltage of the partial pressure connection point to be lower than the overturn voltage of the inverter when the voltage of the power supply is reduced to a first preset voltage, wherein the first preset voltage is higher than the threshold voltage of the MOS tube branch. Under the premise of saving power consumption and cost, the invention can prevent error condition from being generated during the voltage reduction process of the power supply.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a reset circuit. Background technique [0002] In the prior art, the reset circuit (Power on reset, POR) usually refers to the power-on reset circuit, which is mainly aimed at the error state that the logic circuit is prone to occur during the power-on process. After the power supply voltage reaches the normal operating level of the circuit , generate a reset signal to initialize the logic circuit to ensure the correctness of the digital logic. [0003] In order to achieve the purpose of saving power consumption and cost, the currently more common POR circuit will be turned off after power-on. However, there are also many error states that occur during the power supply voltage drop in practice. For example, when the power supply voltage is very low (generally around the threshold voltage), the internal circuits of the chip are all in an off state, and many memory cel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/22
Inventor 刘铭
Owner GIGADEVICE SEMICON (BEIJING) INC
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