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ADM803MAKS-REEL-7

更新时间： 2024-11-14 22:30:27
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亚德诺 - ADI 电源电路电源管理电路微处理器光电二极管监控
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12页 129K
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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 DIAGRAM  
Specified over Temperature  
Low Power Consumption (17 ␮A)  
Precision Voltage Monitor: 2.5 V, 3 V, 3.3 V, 5 V Options  
Reset Assertion Down to 1 V VCC  
140 ms Min Power-On Reset  
ADM803  
V
CC  
RESET  
GENERATOR  
240ms  
RESET  
V
Open-Drain RESET Output (ADM803)  
Push-Pull RESET Output (ADM809)  
Push-Pull RESET Output (ADM810)  
SC70 and SOT-23 Packages  
REF  
GND  
APPLICATIONS  
Microprocessor Systems  
Computers  
ADM809/ADM810  
Controllers  
Intelligent Instruments  
Automotive Systems  
V
CC  
RESET  
GENERATOR  
240ms  
RESET  
(RESET)  
V
REF  
GND  
GENERAL DESCRIPTION  
The ADM803/ADM809/ADM810 supervisory circuits monitor  
the power supply voltage in microprocessor systems. They pro-  
vide 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 opera-  
tional with VCC as low as 1 V. The ADM803 and ADM809  
provide an active low reset signal (RESET), while 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.  
V
CC  
V
V
CC  
CC  
*R  
PULL-UP  
MICROPROCESSOR  
SYSTEM  
ADM803/ADM809  
RESET  
INPUT  
RESET  
GND  
GND  
*ADM803 ONLY  
Figure 1. Typical Operating Circuit  
Seven reset threshold voltage options are available, suitable for  
monitoring a variety of supply voltages. Refer to Table I.  
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  
it suitable for low power portable equipment. The ADM803 is  
available in a 3-lead SC70; the ADM809/ADM810 is available  
in 3-lead SOT-23 and SC70 packages.  
REV. C  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
may result from its use. No license is granted by implication or otherwise  
under any patent or patent rights of Analog Devices. Trademarks and  
registered trademarks are the property of their respective companies.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
www.analog.com  
© 2003 Analog Devices, Inc. All rights reserved.  
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