Microprocessor Reset Circuits
ADM1810–ADM1813/ADM1815–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 (Typ)
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)
Initialize Microprocessor Systems with Added Safety
Available in 3-Lead SOT-23 and SC70 Packages
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
FUNCTIONAL BLOCK DIAGRAMS
ADM1810/ADM1815
RST
V
CC
TOLERANCE
BIAS
TC
REFERENCE
V
CC
150ms
DELAY
GND
V
CC
ADM1811/ADM1816
5.5k
RST
V
CC
TOLERANCE
BIAS
TC
REFERENCE
150ms
DELAY
GND
GENERAL DESCRIPTION
The ADM181x range of voltage monitoring circuits can be 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 can provide a safe startup for electronic
systems. Before a system initializes, the power supply must stabi-
lize. Using the ADM181x series ensures that there are typically
150 ms for the power supply to stabilize before the system is reset
and safe system initialization begins.
The ADM181x series of microprocessor reset circuits are avail-
able in low cost, space-saving SOT-23 and SC70 packages.
ADM1812/ADM1817
V
CC
RST
V
CC
TOLERANCE
BIAS
TC
REFERENCE
150ms
DELAY
GND
ADM1813/ADM1818
V
CC
RESET
MONITOR
V
CC
TOLERANCE
BIAS
TC
REFERENCE
5.5k
RST
150ms
DELAY
GND
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 owners.
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.
ADM1810–ADM1813/ADM1815–ADM1818 SPECIFICATIONS
(V
CC
= Full Operating Range, T
A
= –40 C to +105 C, unless otherwise noted.)
Parameter
SUPPLY
Voltage
Current
OUTPUT CURRENT
RST
Output Source Current
RST Output Source Current
RST
Output Sink Current
8
Min
1
1.2
9
4
350
350
Typ
Max
5.5
5.5
16
10
Unit
V
V
µA
µA
µA
µA
mA
Conditions/Note
T
A
= 0°C to 105°C
T
A
= –40°C to +105°C
V
CC
= 5.5 V, V
CC
> V
TH
, No Load
V
CC
= 3.6 V, V
CC
> V
TH
, No Load
V
CC
≥
V
TH
(Max), Reset Not
Asserted (ADM1810/ADM1815)
V
CC
≤
V
TH
(Min), Reset Asserted
(ADM1812/ADM1817)
V
CC
≥
2.7 V, Reset Asserted,
V
OUT
= 0.4 V, (ADM1810/
ADM1811/ADM1813/ADM1815/
ADM1816/ADM1818)
V
CC
≥
2.7 V, Reset Not Asserted,
V
OUT
= 0.4 V (ADM1812/ADM1817)
(ADM1810/ADM1812/ADM1815/
ADM1817) @ 0
µA
to 500
µA
RST Output Sink Current
OUTPUT VOLTAGE
V
CC
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
ADM1813/ADM1818
OUTPUT CAPACITANCE
RESET ACTIVE TIME
V
CC
DETECT TO RESET
Falling
8
V
CC
– 0.5
V
CC
– 0.1
mA
V
4.50
4.25
2.98
2.80
2.47
2.25
2.12
4.62
4.35
3.06
2.88
2.55
2.31
2.18
4.75
4.49
3.15
2.97
2.64
2.37
2.25
V
V
V
V
V
V
V
3.5
3.1
5.5
5.5
7.5
7.5
10
kΩ
kΩ
pF
ms
µs
µs
(ADM1810/ADM1811/ADM1812/
ADM1813)
(ADM1815/ADM1816/ADM1817/
ADM1818)
t
R
= 5
µs
(ADM1813/ADM1818)
(ADM1813/ADM1818)
100
150
10
10
250
Rising
PUSH-BUTTON DETECT TO
RST
PUSH-BUTTON RESET
Specifications subject to change without notice.
100
1
100
150
250
ms
µs
150
250
ms
–2–
REV. C
ADM1810–ADM1813/ADM1815–ADM1818
ABSOLUTE MAXIMUM RATINGS*
(T
A
= 25°C, unless otherwise noted.)
PIN CONFIGURATION
RST/RST
1
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +6.0 V
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Operating Temperature Range . . . . . . . . . . –40°C to +105°C
JA
Thermal Impedance, SOT-23 . . . . . . . . . . . . . . . 270°C/W
JA
Thermal Impedance, SC70 . . . . . . . . . . . . . . . . . 146°C/W
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300°C
Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
Storage Temperature Range . . . . . . . . . . . . –65°C to +150°C
*Stresses
above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum ratings
for extended periods of time may affect device reliability.
ADM181x
TOP VIEW
(Not to Scale)
V
CC
2
3 GND
PIN FUNCTION DESCRIPTIONS
Pin
1
Mnemonic
RST/RST
Function
Reset Output.
RST/RST
remains active
while V
CC
is below the reset threshold
and remains active for 150 ms (typ) after
V
CC
rises above the reset threshold.
Supply voltage being monitored.
0 V. Ground reference for all signals.
2
3
V
CC
GND
ORDERING GUIDE
Model*
Trip
Point
Package
Option
Brand
Model*
Trip
Point
Package
Option
Brand
ADM1810-5AKS-REEL
ADM1810-5AKS-REEL7
ADM1810-5ART-REEL
ADM1810-5ART-REEL7
ADM1810-10AKS-REEL
ADM1810-10AKS-REEL7
ADM1810-10ART-REEL
ADM1810-10ART-REEL7
ADM1811-5AKS-REEL
ADM1811-5AKS-REEL7
ADM1811-5ART-REEL
ADM1811-5ART-REEL7
ADM1811-10AKS-REEL
ADM1811-10AKS-REEL7
ADM1811-10ART-REEL
ADM1811-10ART-REEL7
ADM1812-5AKS-REEL
ADM1812-5AKS-REEL7
ADM1812-5ART-REEL
ADM1812-5ART-REEL7
ADM1812-10AKS-REEL
ADM1812-10AKS-REEL7
ADM1812-10ART-REEL
ADM1812-10ART-REEL7
ADM1813-5AKS-REEL
ADM1813-5AKS-REEL7
ADM1813-5ART-REEL7
*Only
available in reels.
4.62 V
4.62 V
4.62 V
4.62 V
4.35 V
4.35 V
4.35 V
4.35 V
4.62 V
4.62 V
4.62 V
4.62 V
4.35 V
4.35 V
4.35 V
4.35 V
4.62 V
4.62 V
4.62 V
4.62 V
4.35 V
4.35 V
4.35 V
4.35 V
4.62 V
4.62 V
4.62 V
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
MZV
MZV
MZV
MZV
MZT
MZT
MZT
MZT
M1V
M1V
M1V
M1V
M1T
M1T
M1T
M1T
MTV
MTV
MTV
MTV
MTT
MTT
MTT
MTT
M3V
M3V
M3V
ADM1813-5ART-REEL7
ADM1813-10AKS-REEL
ADM1813-10AKS-REEL7
ADM1813-10ART-REEL
ADM1813-10ART-REEL7
ADM1815-5AKS-REEL
ADM1815-5AKS-REEL7
ADM1815-5ART-REEL
ADM1815-5ART-REEL7
ADM1815-10AKS-REEL
ADM1815-10AKS-REEL7
ADM1815-10ART-REEL
ADM1815-10ART-REEL7
ADM1815-20AKS-REEL
ADM1815-20AKS-REEL7
ADM1815-20ART-REEL
ADM1815-20ART-REEL7
ADM1815-R22AKS-REEL
ADM1815-R22AKS-REEL7
ADM1815-R22ART-REEL
ADM1815-R22ART-REEL7
ADM1815-R23AKS-REEL
ADM1815-R23AKS-REEL7
ADM1815-R23ART-REEL
ADM1815-R23ART-REEL7
ADM1816-5AKS-REEL
ADM1816-5AKS-REEL7
4.62 V
4.35 V
4.35 V
4.35 V
4.35 V
3.06 V
3.06 V
3.06 V
3.06 V
2.88 V
2.88 V
2.88 V
2.88 V
2.55 V
2.55 V
2.55 V
2.55 V
2.18 V
2.18 V
2.18 V
2.18 V
2.31 V
2.31 V
2.31 V
2.31 V
3.06 V
3.06 V
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
M3V
M3T
M3T
M3T
M3T
M5K
M5K
M5K
M5K
M5E
M5E
M5E
M5E
M5A
M5A
M5A
M5A
M5B
M5B
M5B
M5B
M5C
M5C
M5C
M5C
M6K
M6K
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADM1810–ADM1813/ADM1815–ADM1818 features proprietary ESD protection circuitry,
permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore,
proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
REV. C
–3–
ADM1810–ADM1813/ADM1815–ADM1818
ORDERING GUIDE (continued)
Model*
Trip
Point
Package
Option
Brand
Model*
Trip
Point
Package
Option
Brand
ADM1816-5ART-REEL
ADM1816-5ART-REEL7
ADM1816-10AKS-REEL
ADM1816-10AKS-REEL7
ADM1816-10ART-REEL
ADM1816-10ART-REEL7
ADM1816-20AKS-REEL
ADM1816-20AKS-REEL7
ADM1816-20ART-REEL
ADM1816-20ART-REEL7
ADM1816-R22AKS-REEL
ADM1816-R22AKS-REEL7
ADM1816-R22ART-REEL
ADM1816-R22ART-REEL7
ADM1816-R23AKS-REEL
ADM1816-R23AKS-REEL7
ADM1816-R23ART-REEL
ADM1816-R23ART-REEL7
ADM1817-5AKS-REEL
ADM1817-5AKS-REEL7
ADM1817-5ART-REEL
ADM1817-5ART-REEL7
ADM1817-10AKS-REEL
ADM1817-10AKS-REEL7
ADM1817-10ART-REEL
ADM1817-10ART-REEL7
ADM1817-20AKS-REEL
ADM1817-20AKS-REEL7
ADM1817-20ART-REEL
*Only
available in reels.
3.06 V
3.06 V
2.88 V
2.88 V
2.88 V
2.88 V
2.55 V
2.55 V
2.55 V
2.55 V
2.18 V
2.18 V
2.18 V
2.18 V
2.31 V
2.31 V
2.31 V
2.31 V
3.06 V
3.06 V
3.06 V
3.06 V
2.88 V
2.88 V
2.88 V
2.88 V
2.55 V
2.55 V
2.55 V
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
M6K
M6K
M6E
M6E
M6E
M6E
M6A
M6A
M6A
M6A
M6B
M6B
M6B
M6B
M6C
M6C
M6C
M6C
M7K
M7K
M7K
M7K
M7E
M7E
M7E
M7E
M7A
M7A
M7A
ADM1817-20ART-REEL7
ADM1817-R22AKS-REEL
ADM1817-R22AKS-REEL7
ADM1817-R22ART-REEL
ADM1817-R22ART-REEL7
ADM1817-R23AKS-REEL
ADM1817-R23AKS-REEL7
ADM1817-R23ART-REEL
ADM1817-R23ART-REEL7
ADM1818-5AKS-REEL
ADM1818-5AKS-REEL7
ADM1818-5ART-REEL
ADM1818-5ART-REEL7
ADM1818-10AKS-REEL
ADM1818-10AKS-REEL7
ADM1818-10ART-REEL
ADM1818-10ART-REEL7
ADM1818-20AKS-REEL
ADM1818-20AKS-REEL7
ADM1818-20ART-REEL
ADM1818-20ART-REEL7
ADM1818-R22AKS-REEL
ADM1818-R22AKS-REEL7
ADM1818-R22ART-REEL
ADM1818-R22ART-REEL7
ADM1818-R23AKS-REEL
ADM1818-R23AKS-REEL7
ADM1818-R23ART-REEL
ADM1818-R23ART-REEL7
2.55 V
2.18 V
2.18 V
2.18 V
2.18 V
2.31 V
2.31 V
2.31 V
2.31 V
3.06 V
3.06 V
3.06 V
3.06 V
2.88 V
2.88 V
2.88 V
2.88 V
2.55 V
2.55 V
2.55 V
2.55 V
2.18 V
2.18 V
2.18 V
2.18 V
2.31 V
2.31 V
2.31 V
2.31 V
RT-3 (SOT-23)
KS-3 (SC70))
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
KS-3 (SC70)
KS-3 (SC70)
RT-3 (SOT-23)
RT-3 (SOT-23)
M7A
M7B
M7B
M7B
M7B
M7C
M7C
M7C
M7C
M8K
M8K
M8K
M8K
M8E
M8E
M8E
M8E
M8A
M8A
M8A
M8A
M8B
M8B
M8B
M8B
M8C
M8C
M8C
M8C
–4–
REV. C
Typical Performance Characteristics–ADM1810–ADM1813/ADM1815–ADM1818
10
1.011
1.009
1.007
1.005
1.003
1.001
0.999
0.997
DEVIATION (FALL)
8
NORMALIZED RESET THRESHOLD
I
CC
@V
CC
= 5.5V
I
CC
– A
6
I
CC
@V
CC
= 3V
DEVIATION (RISE)
4
2
0
–40
–20
0
20
30
50
70
85
TEMPERATURE – C
100
120
0.995
–40
–20
0
20
30
50
70
85
TEMPERATURE – C
100
120
TPC 1. Supply Current vs. Temperature
TPC 4. Normalized Reset Threshold vs. Temperature
900
800
60
50
s
POWER-DOWN RESET DELAY –
700
600
500
VOD = 20mV
400
300
VOD = 125mV
200
100
VOD = 200mV
0
–40
–20
0
20
30
50
70
85
TEMPERATURE – C
100
120
MAXIMUM TRANSIENT – s
40
30
20
10
0
10
30
40
60
80
100
200 400
600
800 1000
V
TH
– V
CC
– mV
TPC 2. Power-Down Reset Delay vs. Temperature
TPC 5. Maximum Transient Duration without Causing
a Reset Pulse vs. Reset Comparator Overdrive
380
370
POWER-UP RESET TIMEOUT – ms
360
350
340
330
320
310
300
290
–40
–20
0
20
30
50
70
85
TEMPERATURE – C
100
120
TPC 3. Power-Up Reset Timeout vs. Temperature
REV. C
–5–
京公网安备 11010802033920号
EEWORLD
