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ADM809SART-REEL-7 Datasheet(PDF) 1 Page - Analog Devices

No. de pieza ADM809SART-REEL-7
Descripción Electrónicos  Microprocessor Supervisory Circuits in 3-Lead SC70 and SOT-23
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ADM809SART-REEL-7 Datasheet(HTML) 1 Page - Analog Devices

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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, nor for any infringements of patents or other rights of third parties that
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
www.analog.com
Fax: 781/326-8703
© 2003 Analog Devices, Inc. All rights reserved.
ADM803/ADM809/ADM810
Microprocessor Supervisory Circuits
in 3-Lead SC70 and SOT-23
FEATURES
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
Open-Drain
RESET Output (ADM803)
Push-Pull
RESET Output (ADM809)
Push-Pull RESET Output (ADM810)
SC70 and SOT-23 Packages
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
FUNCTIONAL BLOCK DIAGRAM
VREF
VCC
RESET
GENERATOR
240ms
RESET
(RESET)
GND
ADM809 /ADM810
VREF
VCC
RESET
GENERATOR
240ms
ADM803
RESET
GND
RESET
RESET
INPUT
GND
GND
VCC
VCC
MICROPROCESSOR
SYSTEM
ADM803 /ADM809
VCC
*RPULL-UP
*ADM803 ONLY
Figure 1. Typical Operating Circuit
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.
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.


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