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Power-on reset circuits including first and second signal generators and related methods

A signal generator, power-on reset technology, applied in electronic switches, logic circuits, data reset devices, etc., can solve problems such as large resistances of resistors R1 and R2

Inactive Publication Date: 2004-03-31
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to reduce the waiting current, the resistance values ​​of resistors R1 and R2 may be large in conventional power-on reset circuits

Method used

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  • Power-on reset circuits including first and second signal generators and related methods
  • Power-on reset circuits including first and second signal generators and related methods
  • Power-on reset circuits including first and second signal generators and related methods

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Embodiment Construction

[0025] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings in which typical embodiments of the invention are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that these disclosures will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. It should be understood that when an element is referred to as being "coupled" or "connected" to another element, the element can be coupled or connected to the other element either directly or through intervening elements. In contrast, when one element is referred to as being "directly coupled" or "directly connected" to another element, there are no intervening elements present. Terms used herein are to be given their usual meanings, unless otherwise expressly defined herein.

[0026] image 3 A ...

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Abstract

A power-on reset circuit which outputs a power-on reset signal through an output node includes a first signal generator that generates a first signal voltage. The first signal voltage increases from a ground voltage when a power supply voltage reaches a first threshold voltage. A second signal generator generates a second signal voltage, and the second signal voltage decreases from the power supply voltage when the power supply voltage reaches a second threshold voltage. A comparator activates the power-on reset signal responsive to a comparison of the first and second signals.

Description

technical field [0001] The invention relates to a semiconductor integrated circuit device, in particular to a power-on reset circuit and a power-on reset method. Background technique [0002] When the power supply voltage applied to the internal circuits of the integrated semiconductor device is turned on, the voltage increases significantly for a period of time. However, the supply voltage may be unstable below a certain threshold voltage level. When a power supply voltage is lower than a threshold voltage level and increases, a short circuit and a standby current may be generated in an internal circuit (eg, a CMOS circuit) of an integrated semiconductor circuit device. [0003] In order to reduce short-circuit current, circuits are generally developed to disable internal circuits until the power supply voltage becomes stable. Such a circuit is called a "power-on reset circuit". Therefore, the power-on reset circuit can be used to reduce the application of unstable power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/24H03K17/22
CPCH03K17/223H03K17/22
Inventor 权奇元
Owner SAMSUNG ELECTRONICS CO LTD
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