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Microprocessor Reset Circuits ADM1810-ADM1813/ADM1815-ADM1818
FUNCTIONAL BLOCK DIAGRAMS
ADM1810/ADM1815
RST VCC TOLERANCE BIAS TC REFERENCE VCC
FEATURES Reliable Low-Cost Voltage Monitor with Reset Output Supports Monitoring of Supplies Within 5%, 10%, 15%, and 20% Tolerances 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 APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems
150ms DELAY
GND
ADM1812/ADM1817
VCC RST VCC TOLERANCE BIAS TC REFERENCE
150ms DELAY
GENERAL DESCRIPTION
GND
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 packages.
Table I. ADM1810-ADM1813/ADM1815-ADM1818 Features
VCC
ADM1813/ADM1818
RESET MONITOR VCC TOLERANCE BIAS TC REFERENCE 5.5k RST
150ms DELAY
GND
PushAvailable TripVCC Pull/ Reset Points (Given Nominal Open- Active Manual as % below 5 V/3.3 V Drain* State Reset Nominal VCC) ADM1810 ADM1811 ADM1812 ADM1813 ADM1815 ADM1816 ADM1817 ADM1818 5V 5V 5V 5V 3.3 V 3.3 V 3.3 V 3.3 V PP OD PP OD PP OD PP OD Low Low High Low Low Low High Low N N N Y N N N Y 5%, 10% 5%, 10% 5%, 10% 5%, 10% 20% 20% 20% 10%, 20%
VCC
ADM1811/ADM1816
5.5k RST VCC TOLERANCE BIAS TC REFERENCE
150ms DELAY
GND
*Open drain with internal pull-up
REV. A
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. 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 (c) Analog Devices, Inc., 2002
ADM1810-ADM1813/ADM1815-ADM1818-SPECIFICATIONS
(TA = -40 C to +85 C unless otherwise noted.)
Parameter SUPPLY Voltage Current Conditions/Note Min 1.2 (ADM1810/ADM1811/ADM1813) VCC < 5.5 V, RST Output Open (ADM1812) VCC < 5.5 V (ADM1815/ADM1816/ADM1817/ADM1818) VCC < 5.5 V, RST Output Open @ 0.4 V, VCC 2.7 V* 8 (ADM1810/ADM1812/ADM1815/ADM1817) @ 2.4 V, VCC 2.7 V 30 30 28 Typ Max Unit 5.5 40 40 35 V A A A mA A V
OUTPUT CURRENT
350
OUTPUT VOLTAGE VCC TRIP-POINT ADM1810-5, ADM1810-10, ADM1811-5, ADM1812-5, ADM1813-5 ADM1811-10, ADM1812-10, ADM1813-10 ADM1818-10 ADM1815-20, ADM1816-20, ADM1817-20, ADM1818-20 INTERNAL PULL-UP RESISTOR ADM1811/ADM1813/ADM1816/ADM1818 OUTPUT CAPACITANCE RESET ACTIVE TIME VCC DETECT TO RST Falling Rising PUSH-BUTTON DETECT TO RST PUSH-BUTTON RESET
(ADM1810/ADM1812/ADM1815/ADM1817) VCC - 0.5 VCC - 0.1 @ 0 A to 500 A
4.50 4.25 2.80 2.47 3.5
4.62 4.35 2.88 2.55 5.5
4.75 V 4.49 V 2.97 V 2.64 V 7.5 10 k pF
100 (ADM1810/ADM1811/ADM1812/ADM1813) (ADM1815/ADM1816/ADM1817/ADM1818) tR = 5 s 100 (ADM1813/ADM1818) (ADM1818) 2.7 V VCC 3.3 V (ADM1813) 1 100 100
150 5 7 150
300 ms 10 s 15 s 300 ms s
150 150
300 ms 300 ms
*For ADM181x-20, V CC = V CCTP, sink current reduces to 8 mA. Specifications subject to change without notice.
-2-
REV. A
ADM1810-ADM1813/ADM1815-ADM1818
ABSOLUTE MAXIMUM RATINGS
(TA = 25C unless otherwise noted.)
PIN CONFIGURATION
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 V to 5.5 V Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 A Operating Temperature Range . . . . . . . . . . . -40C to +85C Power Dissipation, RT-3 (SOT-23) . . . . . . . . . . . . . 320 mW Derate by 4 mW/C Above 70C JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 333C/W Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . 300C Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . 215C Infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220C Storage Temperature Range . . . . . . . . . . . . -65C to +150C ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 kV
RST/RST 1
ADM181x
TOP VIEW 3 GND (Not to Scale) VCC 2
PIN FUNCTION DESCRIPTIONS
Pin Mnemonic Function 1 RST/RST Reset Output. RST/RST remains active while VCC is below the reset threshold, and remains active for 150 ms (typ) after VCC rises above the reset threshold. Supply Voltage Being Monitored 0 V. Ground Reference for All Signals.
2 3
VCC GND
ORDERING GUIDE
Model* ADM1810-5ART-REEL ADM1810-5ART-RL7 ADM1810-10ART-REEL ADM1810-10ART-RL7 ADM1811-5ART-REEL ADM1811-5ART-RL7 ADM1811-10ART-REEL ADM1811-10ART-RL7 ADM1812-5ART-REEL ADM1812-5ART-RL7 ADM1812-10ART-REEL ADM1812-10ART-RL7 ADM1813-5ART-REEL ADM1813-5ART-RL7 ADM1813-10ART-REEL ADM1813-10ART-RL7 ADM1815-20ART-REEL ADM1815-20ART-RL7 ADM1816-20ART-REEL ADM1816-20ART-RL7 ADM1817-20ART-REEL ADM1817-20ART-RL7 ADM1818-10ART-REEL ADM1818-10ART-RL7 ADM1818-20ART-REEL ADM1818-20ART-RL7 Trip-Point 4.62 V 4.62 V 4.35 V 4.35 V 4.62 V 4.62 V 4.35 V 4.35 V 4.62 V 4.62 V 4.35 V 4.35 V 4.62 V 4.62 V 4.35 V 4.35 V 2.55 V 2.55 V 2.55 V 2.55 V 2.55 V 2.55 V 2.88 V 2.88 V 2.55 V 2.55 V Package Option RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) RT-3 (SOT-23) Brand Information MZV MZV MZT MZT M1V M1V M1T M1T MTV MTV MTT MTT M3V M3V M3T M3T M5A M5A M6A M6A M7A M7A M8E M8E M8A M8A
RL7 or REEL7 are in reels of 3,000 parts. REEL are in reels of 10,000 parts. All models in bold are ex-stock. Consult factory for availability. *Only available in reels.
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.
WARNING!
ESD SENSITIVE DEVICE
REV. A
-3-
ADM1810-ADM1813/ADM1815-ADM1818
VCC VCC TRIP-POINT(MAX) VCC TRIP-POINT VCC TRIP-POINT(MIN) RST VCC TO RESET DELAY
ADM1810, ADM1812, ADM1815, AND ADM1817
The ADM1812 is a 5 V low-cost voltage monitor with an active high push-pull output. The ADM1812 supports a 5% or 10% tolerance. The ADM1810 is similar to the ADM1812, except that the ADM1810 has an active low push-pull output. The ADM1817 is a 3.3 V voltage monitor with an active high push-pull output. The ADM1817 supports a 20% tolerance. The ADM1815 is similar to the ADM1817, except that the ADM1815 has an active low push-pull output. The ADM1810/ADM1812/ADM1815/ADM1817 can be connected directly to most microprocessor reset inputs without the need for external components.
VCC
VOL
Figure 1. Power-Down Timing Diagram
VCC TRIP-POINT (MAX) VCC TRIP-POINT VCC TRIP-POINT (MIN) VCC RESET ACTIVE TIMEOUT
ADM1810/ ADM1812/ ADM1815/ ADM1817
VCC RST/RST GND
MICROPROCESSOR
RESET
RST
Figure 2. Power-Up Timing Diagram
ADM1813 AND ADM1818
Figure 5. ADM1810/ADM1812/ADM1815/ADM1817 Typical Application
ADM1811 AND ADM1816
The ADM1813 and ADM1818 are low-cost voltage monitoring devices featuring an open drain output and optional push-button reset function.
VCC
ADM1813/ ADM1818
VCC RST
MICROPROCESSOR RESET
The ADM1811 is a low-cost voltage monitor with an open drain output. The ADM1811 is designed to monitor 5 V supplies. The ADM1811 range comes in two different variants that allow the monitoring of a 5 V supply with a tolerance of 5% or 10%. The ADM1816 is a 3.3 V version of the ADM1811 and supports a 20% tolerance option.
VCC
GND
ADM1811/ ADM1816
VCC RST GND
MICROPROCESSOR
RESET
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 s, then, when the reset button releases the RST line to float high, the RST line will stay low for a further 150 ms typical.
PUSH-BUTTON TIME RESET TIMEOUT VOLTAGE INPUT HIGH VOLTAGE INPUT LOW
Figure 6. ADM1811/ADM1816 Typical Application
Figure 4. Push-Button Reset Timing Diagram
The ADM1818 range has options that allow the user to monitor 3.3 V supplies with 10% and 20% tolerance options; the ADM1813 range has options that allow the user to monitor 5 V supplies with 5% and 10% tolerance options.
-4-
REV. A
ADM1810-ADM1813/ADM1815-ADM1818
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
3-Lead Plastic Surface-Mount Package (SOT-23) (RT-3)
0.1200 (3.048) 0.1102 (2.799)
0.0550 (1.397) 0.0470 (1.194) PIN 1 0.0236 (0.599) 0.0177 (0.450)
3 1 2
0.1040 (2.642) 0.0827 (2.101)
0.0413 (1.049) 0.0374 (0.950) 0.0807 (2.050) 0.0701 (1.781) 0.0440 (1.118) 0.0320 (0.813) 0.0210 (0.533) 0.0146 (0.371) 0.0100 (0.254) 0.0050 (0.127) 0.0059 (0.150) 0.0034 (0.086)
0.0040 (0.102) 0.0005 (0.013) SEATING PLANE
0.027 (0.686) REF
REV. A
-5-
ADM1810-ADM1813/ADM1815-ADM1818 Revision History
Location Data Sheet changed from REV. A to REV. A. Page
Addition of Table I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Addition of new text to ADM1813 and ADM1818 section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
-6-
REV. A
-7-
-8-
C00064-0-3/02(A)
PRINTED IN U.S.A.

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