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ADM809MART

更新时间： 2024-11-28 22:53:35
品牌 Logo 应用领域
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
页数 文件大小 规格书
6页 175K
描述
Microprocessor Supervisory Circuit in 3-Pin SOT-23

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Microprocessor  
Supervisory Circuit in 3-Pin SOT-23  
a
ADM809/ADM810  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Superior Upgrade for MAX809/MAX810  
Specified Over Temperature  
Low Power Consumption (17 ␮A)  
Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options  
Reset Assertion Down to 1 V VCC  
140 ms min Power-On Reset  
ADM809/ADM810  
V
CC  
RESET  
GENERATOR  
240ms  
RESET  
(RESET)  
V
REF  
Logic Low RESET Output (ADM809)  
Logic High RESET Output (ADM810)  
GND  
APPLICATIONS  
Microprocessor Systems  
Computers  
Controllers  
Intelligent Instruments  
Automotive Systems  
GENERAL DESCRIPTION  
The 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 operational with VCC as low as 1 V. The  
ADM809 provides an active low reset signal (RESET) while  
the ADM810 provides an active high signal (RESET) output.  
V
CC  
V
V
CC  
CC  
RESET  
INPUT  
µP  
SYSTEM  
RESET  
ADM809  
Six reset threshold voltage options are available suitable for  
monitoring a variety of supply voltages. Refer to Table I.  
GND  
GND  
The reset comparator features built-in glitch immunity,  
making it immune to fast transients on VCC  
.
Figure 1. Typical Operating Circuit  
The ADM809/ADM810 consumes only 17 µA, making it  
suitable for low power portable equipment. It is packaged in  
a 3-pin SOT-23 package.  
REV. 0  
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  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1997  
123456

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