ADM1818 Datasheet PDF - Analog Devices
| Part Number | ADM1818 | |
| Description | Microprocessor Reset Circuits | |
| Manufacturers | Analog Devices | |
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Data Sheet
Microprocessor Reset Circuits
ADM1810 to ADM1813/ADM1815 to ADM1818
FEATURES
Reliable low cost voltage monitor with reset output
Suitable for monitoring 2.5 V, 3 V, 3.3 V, and 5 V power
supply voltages
Reset threshold levels: 4.62 V, 4.35 V, 3.06 V, 2.88 V, 2.55 V,
2.31 V, and 2.18 V typical
Active high and low push-pull output choices: ADM1810,
ADM1812, ADM1815, and ADM1817
Open-drain with internal pull-up resistor output choices:
ADM1811, ADM1813, ADM1816, and ADM1818
Can be used with a manual push-button to generate a reset:
ADM1813, ADM1818
Initialization of microprocessor systems with added safety
Available in 3-lead SOT-23 and SC70 packages
APPLICATIONS
Microprocessor systems
Computers
Controllers
Intelligent instruments
Automotive systems
GENERAL DESCRIPTION
The ADM181x range of voltage monitoring circuits is used in
any application where an electronic system needs to be reset
when a voltage increases above or below a predetermined value.
Because of the reset delay time incorporated into the ADM181x
series, these devices provide a safe startup for electronic systems.
Before a system initializes, the power supply must stabilize.
Using the ADM181x series ensures that there are typically 150 ms
for the power supply to stabilize before the system resets and
safe system initialization begins.
The ADM181x series of microprocessor reset circuits are
available in low cost, space-saving SOT-23 and SC70 packages.
FUNCTIONAL BLOCK DIAGRAMS
ADM1810/ADM1815
VCC
GND
VCC
TOLERANCE
BIAS
TC
REFERENCE
150ms
DELAY
RST
VCC
GND
ADM1811/ADM1816
5.5kΩ
VCC
TOLERANCE
BIAS
TC
REFERENCE
150ms
DELAY
RST
ADM1812/ADM1817
VCC
GND
VCC
TOLERANCE
BIAS
TC
REFERENCE
150ms
DELAY
RST
VCC
GND
ADM1813/ADM1818
VCC
TOLERANCE
BIAS
TC
REFERENCE
RESET
MONITOR
5.5kΩ
150ms
DELAY
RST
Figure 1.
Rev. F
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1999–2013 Analog Devices, Inc. All rights reserved.
Technical Support
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Data Sheet
ADM1810 to ADM1813/ADM1815 to ADM1818
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
RST/RST 1
ADM181x
TOP VIEW 3 GND
(Not to Scale)
VCC 2
Figure 2. 3-Lead SOT-23 Pin Configuration
VCC 1
ADM181x
TOP VIEW 3 GND
(Not to Scale)
RST/RST 2
Figure 3. 3-Lead SC70 Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
SOT-23 SC70 Mnemonic Description
1 2 RST
Active High Reset Output. RST remains high while VCC is below the reset threshold and remains high for
150 ms typical after VCC rises above the reset threshold. Applies to the ADM1812 and ADM1817 only.
RST Active Low Reset Output. RST remains low while VCC is below the reset threshold and remains low for
150 ms typical after VCC rises above the reset threshold. Applies to the ADM1810, ADM1811, ADM1813,
ADM1815, ADM1816, and ADM1818 only.
2 1 VCC
Supply Voltage. The supply voltage being monitored.
3 3 GND
Ground. 0 V ground reference for all signals.
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