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 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.
Microprocessor Reset Circuits
FUNCTIONAL BLOCK DIAGRAMS
V
CC
TOLERANCE
GND
V
CC
GND
V
CC
GND
V
CC
GND
REFERENCE
TOLERANCE
REFERENCE
TOLERANCE
REFERENCE
TOLERANCE
REFERENCE
ADM1810/ADM1815
V
CC
BIAS
TC
ADM1811/ADM1816
V
CC
BIAS
TC
ADM1812/ADM1817
V
CC
BIAS
TC
ADM1813/ADM1818
V
CC
BIAS
TC
RESET
MONITOR
Figure 1.
150ms
DELAY
150ms
DELAY
150ms
DELAY
150ms
DELAY
5.5kΩ
5.5kΩ
RST
RST
RST
RST
00064-001
Rev. E
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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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Fax: 781.461.3113 ©1999–2008 Analog Devices, Inc. All rights reserved.
ADM1810 to ADM1813/ADM1815 to ADM1818
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagrams ............................................................. 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
ESD Caution .................................................................................. 4
Pin Configurations and Function Descriptions ........................... 5
REVISION HISTORY
8/08—Rev. D to Rev. E
Changes to Table 3 ............................................................................ 5
Updated Outline Dimensions ......................................................... 8
Changes to Ordering Guide ............................................................ 9
10/05—Rev. C to Rev. D
Updated Format .................................................................. Universal
Added Figure 3 .................................................................................. 5
Changes to Table 3 ............................................................................ 5
Updated Outline Dimensions ......................................................... 8
Editsto Ordering Guide ................................................................... 9
9/03—Rev. B to Rev. C.
Added SC70 ......................................................................... Universal
Edits to Specifications ...................................................................... 2
Edits to Ordering Guide .................................................................. 4
Updated Outline Dimensions ......................................................... 7
Typical Performance Characteristics ..............................................6
Theory of Operation ...........................................................................7
Timing Diagrams for All Devices ...............................................7
ADM1813 and ADM1818 ..............................................................7
ADM1810, ADM1812, ADM1815, and ADM1817 .....................7
ADM1811 and ADM1816 ..............................................................7
Outline Dimensions ..........................................................................8
Ordering Guide .............................................................................9
2/03—Rev. A to Rev. B
.
Edits to Features ................................................................................. 1
Deleted Table I ................................................................................... 1
Edits to Specifications ....................................................................... 2
Edits to Absolute Maximum Ratings .............................................. 3
Edits to Ordering Guide ................................................................... 3
Added Typical Performance Characteristics ................................. 4
Edits to ADM1813 AND ADM1818 section ................................. 5
Edits to ADM1810, ADM1812, ADM1815, and
ADM1817 Section ............................................................................. 5
Edits to ADM1811 and ADM1816 Section ................................... 5
Updated Outline Dimensions .......................................................... 6
3/02—Rev. 0 to Rev. A.
Addition of Table .............................................................................. 1
Edits to Ordering Guide ................................................................... 3
Addition of New Text to ADM1813 and ADM1818 Section ...... 4
4/99—Rev.0: Initial Version
Rev. E | Page 2 of 16
ADM1810 to ADM1813/ADM1815 to ADM1818
SPECIFICATIONS
VCC = full operating range, TA = −40°C to +105°C, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit Comments
SUPPLY
Voltage 1 5.5 V TA = 0°C to 105°C
1.2 5.5 V TA = −40°C to +105°C
Current 9 16 μA VCC = 5.5 V, VCC > VTH, no load
4 10 μA VCC = 3.6 V, VCC > VTH, no load
OUTPUT CURRENT
RST
Output Source Current
RST Output Source Current 350 μA VCC ≤ VTH (min), reset asserted (ADM1812/ADM1817)
RST
Output Sink Current
RST Output Sink Current 8 mA
OUTPUT VOLTAGE VCC − 0.5 VCC − 0.1 V
VCC TRIP POINT
ADM1810-5, ADM1811-5, ADM1812-5,
ADM1813-5
ADM1810-10, ADM1811-10,
ADM1812-10, ADM1813-10
ADM1815-5, ADM1816-5, ADM1817-5,
ADM1818-5
ADM1815-10, ADM1816-10,
ADM1817-10, ADM1818-10
ADM1815-20, ADM1816-20,
ADM1817-20, ADM1818-20
ADM1815-R23, ADM1816-R23,
ADM1817-R23, ADM1818-R23
ADM1815-R22, ADM1816-R22,
ADM1817-R22, ADM1818-R22
INTERNAL PULL-UP RESISTOR
ADM1811/ADM1816 3.5 5.5 7.5 kΩ
ADM1813/ADM1818 3.1 5.5 7.5 kΩ
OUTPUT CAPACITANCE 10 pF
RESET ACTIVE TIME 100 150 250 ms
VCC DETECT TO RESET
Falling 10 μs
Rising 100 150 250 ms tR = 5 μs
PUSH-BUTTON DETECT TO
PUSH-BUTTON RESET 100 150 250 ms (ADM1813/ADM1818)
RST
350 μA VCC ≥ VTH (max), reset not asserted (ADM1810/ADM1815)
8 mA
4.50 4.62 4.75 V
4.25 4.35 4.49 V
2.98 3.06 3.15 V
2.80 2.88 2.97 V
2.47 2.55 2.64 V
2.25 2.31 2.37 V
2.12 2.18 2.25 V
1 μs (ADM1813/ADM1818)
≥ 2.7 V, reset asserted, V
V
CC
(ADM1810/ADM1811/ADM1813/ADM1815/ADM1816/
ADM1818)
≥ 2.7 V, reset not asserted, V
V
CC
(ADM1812/ADM1817)
ADM1810/ADM1812/ADM1815/ADM1817 @ 0 μA to
500 μA
= 0.4 V
OUT
= 0.4 V
OUT
Rev. E | Page 3 of 16
ADM1810 to ADM1813/ADM1815 to ADM1818
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 2.
Parameter Rating
VCC −0.3 V to +6.0 V
Input Current 20 mA
Operating Temperature Range −40°C to +105°C
Storage Temperature Range −65°C to +150°C
θ
Thermal Impedance, SOT-23
JA
θ
Thermal Impedance, SC70
JA
Lead Temperature (Soldering, 10 sec) 300°C
Vapor Phase (60 sec) 215°C
Infrared (15 sec) 220°C
270°C/W
146°C/W
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. E | Page 4 of 16
ADM1810 to ADM1813/ADM1815 to ADM1818
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
RST/RST
V
CC
1
ADM181x
TOP VIEW
(Not to Scale)
2
3
GND
00064-002
Figure 2. 3-Lead SOT-23 Pin Configuration
V
1
CC
ADM181x
TOP VIEW
(Not to Scale)
RST/RST
2
Figure 3. 3-Lead SC70 Pin Configuration
Table 3. Pin Function Descriptions
Pin No.
SOT-23 SC70
1 2 RST
Mnemonic Function
Active High Reset Output. RST remains high while V
threshold and remains high for 150 ms typical after V
threshold. Applies to the ADM1812 and ADM1817 only.
Active Low Reset Output. RST remains low while VCC is below the reset threshold
RST
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.
3
GND
00064-014
is below the reset
CC
rises above the reset
CC
Rev. E | Page 5 of 16