Power-on reset circuit with long power-on reset time-delay and short power-off response time

A delay circuit, electrical reset technology, applied in electrical components, electronic switches, pulse technology, etc., can solve problems such as short pulse width reset signal glitches, power supply fluctuations, etc.

Active Publication Date: 2014-07-09
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to solve the problem of power fluctuation or immediately power on again in the existing circuit on the basis of realizing long power-on reset delay and short power-off reset response time, so as to generate a short pulse width reset signal glitch problem

Method used

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  • Power-on reset circuit with long power-on reset time-delay and short power-off response time
  • Power-on reset circuit with long power-on reset time-delay and short power-off response time
  • Power-on reset circuit with long power-on reset time-delay and short power-off response time

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specific Embodiment approach

[0036] Under normal circumstances, if the low level of the output reset signal represents reset, and the high level represents release of reset, then the preferred specific implementation of the present invention is as follows:

[0037] Such as image 3 As shown, the power-on reset circuit consists of the following parts:

[0038] A power supply voltage detection circuit (10), the output terminal of which is connected to the second input terminal of the first NAND gate (13);

[0039] Delay circuit (11), its input terminal is connected to the output terminal of the first NAND gate (13), and its output terminal is connected to the first input terminal of NOR gate (16) and the input terminal of inverter (14);

[0040] The first NAND gate (13), its first input terminal is connected to the output terminal of the second NAND gate (15), its second input terminal is connected to the output terminal of the power supply voltage detection circuit (10), and its output terminal is connect...

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Abstract

The invention discloses a power-on reset circuit with long power-on reset time-delay and short power-off response time, and belongs to the technical field of integrated circuit design. The invention provides the new power-on reset circuit which is mainly formed by a power supply voltage detection circuit, a time-delay circuit and a few digital logic units. The circuit can realize long power-on reset time-delay and short power-off reset response time; meanwhile, in the power-off process, once the power supply voltage detection circuit generates a reset signal, the circuit is allowed to enter a reset locking state until the output of the time-delay circuit returns to a reset state, so that the circuit is guaranteed to still produce reset signals with enough delay time when the circuit is powered on again, and the problem that a conventional power-on reset circuit generates short pulse width reset signal burrs since the conventional power-on reset circuit is easy to be influenced by power supply fluctuation or the power-on again in the power-off process is solved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design, and in particular relates to a power-on reset circuit. Background technique [0002] After the integrated circuit chip is powered on, if there is no reset signal input, the initial logic state of its internal circuit is uncertain. When powering on, the power supply voltage may not reach the minimum voltage value that can work, or the power supply voltage fluctuates greatly in the initial stage of powering on, and has not entered a stable state. If the internal circuit of the chip enters the working state at this time, errors may occur. Therefore, in order to automatically enter the predetermined initial state after the chip is powered on, and to ensure that the circuit starts to work only after the power supply voltage reaches a certain voltage value and stabilizes, it is usually necessary to use a power-on reset circuit (POR, Power-On Reset). [0003] The power-on reset circu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/22
Inventor 孙旭光
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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