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ADM803_08

更新时间： 2024-02-20 05:44:10
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亚德诺 - ADI 微处理器监控
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12页 309K
描述
Microprocessor Supervisory Circuits in 3-Lead SC70 and SOT-23

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Microprocessor Supervisory Circuits  
in 3-Lead SC70 and SOT-23  
ADM803/ADM809/ADM810  
FEATURES  
FUNCTIONAL BLOCK DIAGRAMS  
Specified over temperature  
ADM803  
Low power consumption: 17 μA  
Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options  
Reset assertion down to 1 V VCC  
V
CC  
RESET  
GENERATOR  
240ms  
RESET  
V
REF  
140 ms minimum power-on reset  
Open-drain RESET output (ADM803)  
Push-pull RESET output (ADM809)  
Push-pull RESET output (ADM810)  
SC70 and SOT-23 packages  
GND  
ADM809/ADM810  
APPLICATIONS  
Microprocessor systems  
Computers  
RESET  
GENERATOR  
240ms  
V
CC  
RESET  
(RESET)  
V
REF  
Controllers  
Intelligent instruments  
Automotive systems  
GND  
V
CC  
V
V
*R  
CC  
CC  
PULL-UP  
MICROPROCESSOR  
SYSTEM  
ADM803/ADM809  
RESET  
INPUT  
RESET  
GND  
GND  
*ADM803 ONLY  
Figure 1.  
GENERAL DESCRIPTION  
The ADM803/ADM809/ADM810 supervisory circuits monitor  
the power supply voltage in microprocessor systems. They  
provide a reset output during power-up, power-down, and  
brownout conditions. On power-up, an internal timer holds  
reset asserted for 240 ms. This holds the microprocessor in a  
reset state until conditions have stabilized. The reset output  
remains operational with VCC as low as 1 V. The ADM803 and  
Seven reset threshold voltage options are available, suitable for  
monitoring a variety of supply voltages (see Table 3).  
The reset comparator features built-in glitch immunity, making  
it immune to fast transients on VCC  
.
The ADM803/ADM809/ADM810 consume only 17 μA, making  
them suitable for low power, portable equipment. The ADM803  
is available in a 3-lead SC70; the ADM809/ADM810 are available  
in 3-lead SOT-23 and 3-lead SC70 packages.  
RESET  
ADM809 provide an active low reset signal (  
), whereas  
the ADM810 provides an active high signal (RESET) output.  
The ADM809 and ADM810 have push-pull outputs, whereas  
the ADM803 has an open-drain output, which requires an  
external pull-up resistor.  
Rev. H  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
www.analog.com  
Fax: 781.461.3113 ©1997–2008 Analog Devices, Inc. All rights reserved.  
 
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