aReset (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
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 stabilize. 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 available in low cost, space-saving SOT-23 and SC70 packages.
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.
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.
ADM1813-5ART-REEL74.62 V RT-3 (SOT-23) M3V
ADM1813-10AKS-REEL4.35 V KS-3 (SC70)M3T
ADM1813-10AKS-REEL74.35 V KS-3 (SC70)M3T
ADM1813-10ART-REEL4.35 V RT-3 (SOT-23) M3T
ADM1813-10ART-REEL74.35 V RT-3 (SOT-23) M3T
ADM1815-5AKS-REEL3.06 V KS-3 (SC70)M5K
ADM1815-5AKS-REEL73.06 V KS-3 (SC70)M5K
ADM1815-5ART-REEL3.06 V RT-3 (SOT-23) M5K
ADM1815-5ART-REEL73.06 V RT-3 (SOT-23) M5K
ADM1815-10AKS-REEL2.88 V KS-3 (SC70)M5E
ADM1815-10AKS-REEL72.88 V KS-3 (SC70)M5E
ADM1815-10ART-REEL2.88 V RT-3 (SOT-23) M5E
ADM1815-10ART-REEL72.88 V RT-3 (SOT-23) M5E
ADM1815-20AKS-REEL2.55 V KS-3 (SC70)M5A
ADM1815-20AKS-REEL72.55 V KS-3 (SC70)M5A
ADM1815-20ART-REEL2.55 V RT-3 (SOT-23) M5A
ADM1815-20ART-REEL72.55 V RT-3 (SOT-23) M5A
ADM1815-R22AKS-REEL2.18 V KS-3 (SC70)M5B
ADM1815-R22AKS-REEL7 2.18 V KS-3 (SC70)M5B
ADM1815-R22ART-REEL 2.18 V RT-3 (SOT-23) M5B
ADM1815-R22ART-REEL7 2.18 VRT-3 (SOT-23) M5B
ADM1815-R23AKS-REEL2.31 V KS-3 (SC70)M5C
ADM1815-R23AKS-REEL7 2.31 V KS-3 (SC70)M5C
ADM1815-R23ART-REEL 2.31 V RT-3 (SOT-23) M5C
ADM1815-R23ART-REEL7 2.31 VRT-3 (SOT-23) M5C
ADM1816-5AKS-REEL3.06 V KS-3 (SC70)M6K
ADM1816-5AKS-REEL73.06 V KS-3 (SC70)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)
TripPackage
Model*PointOptionBrand
ADM1816-5ART-REEL3.06 V RT-3 (SOT-23) M6K
ADM1816-5ART-REEL73.06 V RT-3 (SOT-23) M6K
ADM1816-10AKS-REEL2.88 V KS-3 (SC70)M6E
ADM1816-10AKS-REEL72.88 V KS-3 (SC70)M6E
ADM1816-10ART-REEL2.88 V RT-3 (SOT-23) M6E
ADM1816-10ART-REEL72.88 V RT-3 (SOT-23) M6E
ADM1816-20AKS-REEL2.55 V KS-3 (SC70)M6A
ADM1816-20AKS-REEL72.55 V KS-3 (SC70)M6A
ADM1816-20ART-REEL2.55 V RT-3 (SOT-23) M6A
ADM1816-20ART-REEL72.55 V RT-3 (SOT-23) M6A
ADM1816-R22AKS-REEL2.18 V KS-3 (SC70)M6B
ADM1816-R22AKS-REEL7 2.18 V KS-3 (SC70)M6B
ADM1816-R22ART-REEL2.18 V RT-3 (SOT-23) M6B
ADM1816-R22ART-REEL7 2.18 V RT-3 (SOT-23) M6B
ADM1816-R23AKS-REEL2.31 V KS-3 (SC70)M6C
ADM1816-R23AKS-REEL7 2.31 V KS-3 (SC70)M6C
ADM1816-R23ART-REEL2.31 V RT-3 (SOT-23) M6C
ADM1816-R23ART-REEL7 2.31 V RT-3 (SOT-23) M6C
ADM1817-5AKS-REEL3.06 V KS-3 (SC70)M7K
ADM1817-5AKS-REEL73.06 V KS-3 (SC70)M7K
ADM1817-5ART-REEL3.06 V RT-3 (SOT-23) M7K
ADM1817-5ART-REEL73.06 V RT-3 (SOT-23) M7K
ADM1817-10AKS-REEL2.88 V KS-3 (SC70)M7E
ADM1817-10AKS-REEL72.88 V KS-3 (SC70)M7E
ADM1817-10ART-REEL2.88 V RT-3 (SOT-23) M7E
ADM1817-10ART-REEL72.88 V RT-3 (SOT-23) M7E
ADM1817-20AKS-REEL2.55 V KS-3 (SC70)M7A
ADM1817-20AKS-REEL72.55 V KS-3 (SC70)M7A
ADM1817-20ART-REEL2.55 V RT-3 (SOT-23) M7A
*Only available in reels.
TripPackage
Model*PointOptionBrand
ADM1817-20ART-REEL72.55 V RT-3 (SOT-23) M7A
ADM1817-R22AKS-REEL2.18 V KS-3 (SC70))M7B
ADM1817-R22AKS-REEL7 2.18 V KS-3 (SC70)M7B
ADM1817-R22ART-REEL2.18 V RT-3 (SOT-23) M7B
ADM1817-R22ART-REEL7 2.18 V RT-3 (SOT-23) M7B
ADM1817-R23AKS-REEL2.31 V KS-3 (SC70)M7C
ADM1817-R23AKS-REEL7 2.31 V KS-3 (SC70)M7C
ADM1817-R23ART-REEL2.31 V RT-3 (SOT-23) M7C
ADM1817-R23ART-REEL7 2.31 V RT-3 (SOT-23) M7C
ADM1818-5AKS-REEL3.06 V KS-3 (SC70)M8K
ADM1818-5AKS-REEL73.06 V KS-3 (SC70)M8K
ADM1818-5ART-REEL3.06 V RT-3 (SOT-23) M8K
ADM1818-5ART-REEL73.06 V RT-3 (SOT-23) M8K
ADM1818-10AKS-REEL2.88 V KS-3 (SC70)M8E
ADM1818-10AKS-REEL72.88 V KS-3 (SC70)M8E
ADM1818-10ART-REEL2.88 V RT-3 (SOT-23) M8E
ADM1818-10ART-REEL72.88 V RT-3 (SOT-23) M8E
ADM1818-20AKS-REEL2.55 V KS-3 (SC70)M8A
ADM1818-20AKS-REEL72.55 V KS-3 (SC70)M8A
ADM1818-20ART-REEL2.55 V RT-3 (SOT-23) M8A
ADM1818-20ART-REEL72.55 V RT-3 (SOT-23) M8A
ADM1818-R22AKS-REEL2.18 V KS-3 (SC70)M8B
ADM1818-R22AKS-REEL7 2.18 V KS-3 (SC70)M8B
ADM1818-R22ART-REEL2.18 V RT-3 (SOT-23) M8B
ADM1818-R22ART-REEL7 2.18 V RT-3 (SOT-23) M8B
ADM1818-R23AKS-REEL2.31 V KS-3 (SC70)M8C
ADM1818-R23AKS-REEL7 2.31 V KS-3 (SC70)M8C
ADM1818-R23ART-REEL2.31 V RT-3 (SOT-23) M8C
ADM1818-R23ART-REEL7 2.31 V RT-3 (SOT-23) M8C
TPC 5. Maximum Transient Duration without Causing
a Reset Pulse vs. Reset Comparator Overdrive
380
370
360
350
340
330
320
310
POWER-UP RESET TIMEOUT – ms
300
290
–20–4002030507085100 120
TEMPERATURE – ⴗC
TPC 3. Power-Up Reset Timeout vs. Temperature
REV. C
–5–
ADM1810–ADM1813/ADM1815–ADM1818
V
CC
VCC TRIP POINT(MAX)
RST
Figure 1. Power-Down Timing Diagram
V
TRIP POINT (MIN)
CC
V
CC
RST
Figure 2. Power-Up Timing Diagram
ADM1813 AND ADM1818
The ADM1813 and ADM1818 are low cost voltage monitoring
devices featuring an open-drain output and optional pushbutton reset function.
V
V
CC
ADM1813/
ADM1818
V
GND
TRIP POINT
CC
VCC TO RESET
DELAY
V
V
CC
RESET ACTIVE TIMEOUT
CC
RST
VCC TRIP POINT(MIN)
TRIP POINT (MAX)
CC
TRIP POINT
MICRO-
PROCESSOR
RESET
V
OL
The ADM1818 range has 2.88 V and 2.55 V (typ) trip point
options that allow the user to monitor 3.3 V and 3 V supplies. For
5 V monitoring requirements, the ADM1813 range has 4.62 V
and 4.35 V (typ) trip point options.
ADM1810, ADM1812, ADM1815, AND ADM1817
The ADM1812 is a 5 V supply monitor with an active high pushpull output and trip point options of 4.62 V and 4.35 V (typ).
The ADM1810 is similar to the ADM1812, except that the
ADM1810 has an active low push-pull output stage.
The ADM1817 is suitable for monitoring 3.3 V, 3 V, and 2.5 V
supplies, with an active high push-pull output and trip-point
options of 3.06 V, 2.88 V, 2.55 V, 2.31 V, and 2.18 V (typ). The
ADM1815 is similar to the ADM1817, except that the ADM1815
has an active low push-pull output stage.
The ADM1810/ADM1812/ADM1815/ADM1817 can be
connected directly to most microprocessor reset inputs without
the need for external components.
The ADM1811 is a 5 V supply monitor with an active low opendrain output and trip point options of 4.62 V and 4.35 V (typ).
The ADM1816 also has an active low open-drain output but is
suitable for monitoring lower voltage supplies of 3.3 V, 3 V,
and 2.5 V.
Figure 3. ADM1813/ADM1818 Typical Application
An optional push-button reset switch can be connected between
RST and ground. Pressing this switch will pull the reset output
low. If the push-button reset button pulls the RST output low for
a period greater than 1 µs, then, when the reset button releases
the RST line to float high, the RST line will stay low for a further
150 ms typical.
VOLTAGE
INPUT LOW
PUSH-BUTTON TIME
RESET TIMEOUT
VOLTAGE
INPUT HIGH
Figure 4. Push-Button Reset Timing Diagram
–6–
V
CC
ADM1811/
ADM1816
V
CC
RST
GND
MICRO-
PROCESSOR
RESET
Figure 6. ADM1811/ADM1816 Typical Application
REV. C
ADM1810–ADM1813/ADM1815–ADM1818
OUTLINE DIMENSIONS
3-Lead Small Outline Transistor Package [SOT-23]
(RT-3)
Dimensions shown in millimeters
3.04
2.90
1.40
1.30
1.20
PIN 1
0.10
0.01
2.80
3
1
1.90 BSC
SEATING
PLANE
COMPLIANT TO JEDEC STANDARDS TO-236AB
2
0.95 BSC
2.64
2.10
0.50
0.30
1.12
0.89
0.60
0.50
0.40
0.20
0.08
3-Lead Thin Shrink Small Outline Transistor Package [SC70]