ADM803 Datasheet PDF - Analog Devices
| Part Number | ADM803 | |
| Description | Microprocessor Supervisory Circuits | |
| Manufacturers | Analog Devices | |
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Data Sheet
Microprocessor Supervisory Circuits
in 3-Lead SC70 and SOT-23
ADM803/ADM809/ADM810
FEATURES
Specified over temperature
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
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
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
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
ADM809 provide an active low reset signal (RESET), 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.
FUNCTIONAL BLOCK DIAGRAMS
ADM803
VCC
VREF
RESET
GENERATOR
240ms
RESET
GND
ADM809/ADM810
VCC
VREF
RESET
GENERATOR
240ms
RESET
(RESET)
VCC
GND
VCC
ADM803/ADM809
RESET
GND
*RPULL-UP
VCC
MICROPROCESSOR
SYSTEM
RESET
INPUT
GND
*ADM803 ONLY
Figure 1.
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.
Rev. I
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responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1997–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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Data Sheet
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
ADM803/ADM809/ADM810
GND 1 ADM803/
ADM809/
TOP VIEW 3 VCC
(Not to Scale)
RESET 2
Figure 3. ADM803/ADM809 Pin Configuration
GND 1
ADM810
TOP VIEW 3 VCC
(Not to Scale)
RESET 2
Figure 4. ADM810 Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
ADM803/ADM809 ADM810 Mnemonic
1 1 GND
N/A 2 RESET
2 N/A RESET
3 3 VCC
Description
Ground Reference for All Signals; 0 V.
Active High Logic Output. RESET remains high while VCC is below the reset threshold
and remains high for 240 ms (typical) after VCC rises above the reset threshold.
Active Low Logic Output. RESET remains low while VCC is below the reset threshold
and remains low for 240 ms (typical) after VCC rises above the reset threshold.
Supply Voltage Being Monitored.
Rev. I | Page 5 of 11
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| Information | Total 11 Pages | |
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