Microprocessor Reset Circuits
ADM1810 to ADM1813/ADM1815 to ADM1818
FUNCTIONAL BLOCK DIAGRAMS
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
ADM1810/ADM1815
V
CC
RST
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 output choices: ADM1811, ADM1813, ADM1816,
and ADM1818
V
CC
TOLERANCE
BIAS
150ms
DELAY
TC
GND
REFERENCE
Can be used with a manual push-button to generate a reset:
ADM1813, ADM1818
ADM1811/ADM1816
V
CC
Initialization of microprocessor systems with added safety
Available in 3-lead SOT-23 and SC70 packages
5.5kΩ
RST
V
CC
TOLERANCE
APPLICATIONS
BIAS
150ms
DELAY
Microprocessor systems
Computers
Controllers
TC
GND
REFERENCE
Intelligent instruments
Automotive systems
ADM1812/ADM1817
V
CC
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.
RST
V
CC
TOLERANCE
BIAS
150ms
DELAY
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.
TC
GND
REFERENCE
ADM1813/ADM1818
V
CC
5.5kΩ
RESET
MONITOR
RST
The ADM181x series of microprocessor reset circuits are
available in low cost, space-saving SOT-23 and SC70 packages.
V
CC
TOLERANCE
BIAS
150ms
DELAY
TC
GND
REFERENCE
Figure 1.
Rev. E
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