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Microprocessor Reset Circuits ADM1810-ADM1813/ADM1815-ADM1818
FUNCTIONAL BLOCK DIAGRAMS
ADM1810/ADM1815 VCC RST VCC TOLERANCE BIAS TC REFERENCE
FEATURES Reliable Low Cost Voltage Monitor with Reset Output Supports Monitoring of Supplies Within 5%, 10%, 15% and 20% Tolerance 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
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 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.
ADM1813/ADM1818 VCC RESET MONITOR VCC TOLERANCE BIAS TC REFERENCE 5.5k RST
150ms DELAY
GND
ADM1811/ADM1816 VCC 5.5k RST VCC TOLERANCE BIAS TC REFERENCE
150ms DELAY
GND
REV. 0
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 which 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 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 (c) Analog Devices, Inc., 1999
ADM1810-ADM1813/ADM1815-ADM1818-SPECIFICATIONS
(TA = -40 C to +85 C unless otherwise noted)
Parameter SUPPLY Voltage Current Min 1.2 30 30 28 OUTPUT CURRENT 8 350 OUTPUT VOLTAGE VCC TRIP-POINT ADM1810-5, ADM1810-10, ADM1810-15/ ADM1811/ADM1812/ADM1813-5 ADM1811/ADM1812/ADM1813-10 ADM1811/ADM1812/ADM1813-15 ADM1815/ADM1816/ADM1817/ ADM1818-5 ADM1815/ADM1816/ADM1817/ ADM1818-10 ADM1815/ADM1816/ADM1817/ 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 100 100
NOTES *For ADM181x-20, V CC = VCCTP, sink current reduces to 8 mA. Specifications subject to change without notice.
Typ
Max 5.5 40 40 35
Units V A A A mA A V
Test Conditions/Note
(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* (ADM1810/ADM1812/ADM1815/ADM1817) @ 2.4 V, VCC 2.7 V (ADM1810/ADM1812/ADM1815/ADM1817) @ 0 A to 500 A
VCC - 0.5
VCC - 0.1
4.50 4.25 4.00 2.98 2.80 2.47 3.5
4.62 4.35 4.13 3.06 2.88 2.55 5.5
4.75 4.49 4.24 3.15 2.97 2.64 7.5 10
V V V V V V k pF ms s s ms s
(5%) (10%) (15%) (5%) (10%) (20%)
100
150 5 7 150
300 10 15 300
100 1
(ADM1810/ADM1811/ADM1812/ADM1813) (ADM1815/ADM1816/ADM1817/ADM1818) tR = 5 s (ADM1813/ADM1818) (ADM1818) 2.7 V VCC 3.3 V (ADM1813)
150 150
300 300
ms ms
-2-
REV. 0
ADM1810-ADM1813/ADM1815-ADM1818
ORDERING GUIDE
Model* ADM1810-5ART-REEL ADM1810-5ART-REEL7 ADM1810-10ART-REEL ADM1810-10ART-RL7 ADM1810-15ART-REEL ADM1810-15ART-RL7 ADM1811-5ART-REEL ADM1811-5ART-RL7 ADM1811-10ART-REEL ADM1811-10ART-RL7 ADM1811-15ART-REEL ADM1811-15ART-RL7 ADM1812-5ART-REEL ADM1812-5ART-RL7 ADM1812-10ART-REEL ADM1812-10ART-RL7 ADM1812-15ART-REEL ADM1812-15ART-RL7 ADM1813-5ART-REEL ADM1813-5ART-RL7 ADM1813-10ART-REEL ADM1813-10ART-RL7 ADM1813-15ART-REEL ADM1813-15ART-RL7 ADM1815-10ART-REEL ADM1815-10ART-RL7 ADM1815-20ART-REEL ADM1815-20ART-RL7 ADM1816-10ART-REEL ADM1816-10ART-RL7 ADM1816-20ART-REEL ADM1816-20ART-RL7 ADM1817-10ART-REEL ADM1817-10ART-RL7 ADM1817-20ART-REEL ADM1817-20ART-RL7 ADM1818-10ART-REEL ADM1818-10ART-RL7 ADM1818-20ART-REEL ADM1818-20ART-RL7 TripPoint 4.62 V 4.62 V 4.25 V 4.25 V 4.12 V 4.12 V 4.50 V 4.50 V 4.35 V 4.35 V 4.00 V 4.00 V 4.50 V 4.50 V 4.35 V 4.35 V 4.00 V 4.00 V 4.50 V 4.50 V 4.35 V 4.35 V 4.00 V 4.00 V 2.88 V 2.88 V 2.55 V 2.55 V 2.88 V 2.88 V 2.55 V 2.55 V 2.88 V 2.88 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) 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 MZQ MZQ M1V M1V M1T M1T M1Q M1Q MTV MTV MTT MTT MTQ MTQ M3V M3V M3T M3T M3Q M3Q M5E M5E M5A M5A M6E M6E M6A M6A M7E M7E M7A M7A M8E M8E M8A M8A
PIN CONFIGURATION
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
VCC VCC TRIP-POINT(MAX) VCC TRIP-POINT VCC TRIP-POINT(MIN) RST VCC TO RESET DELAY
VOL
Figure 1. Power-Down Timing Diagram
NOTES RL7 or REEL7 are in reels of 3000 parts. REEL are in reels of 10000 parts. All models in bold are ex-stock. Consult factory for availability. *Only Available in Reels.
ABSOLUTE MAXIMUM RATINGS*
VCC TRIP-POINT (MAX) VCC TRIP-POINT VCC TRIP-POINT (MIN) VCC RESET ACTIVE TIMEOUT
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
*Typical values are measured at T A = +25C unless otherwise noted.
RST
Figure 2. Power-Up Timing Diagram
REV. 0
-3-
ADM1810-ADM1813/ADM1815-ADM1818
ADM1813 AND ADM1818 ADM1811 AND ADM1816
The ADM1813 and ADM1818 are low cost voltage monitoring devices with the inclusion of an optional push-button reset function.
VCC
ADM1813/ ADM1818
VCC RST GND
MICROPROCESSOR RESET
VCC
ADM1811/ ADM1816
MICROPROCESSOR
VCC RST GND 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
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)
Figure 4. Push-Button Reset Timing Diagram
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)
The ADM1818 range has options which allow the user to monitor 3.3 V supplies with 10% and 20% tolerance options. While the ADM1813 range has options which allow the user to monitor 5 V supplies with 5%, 10% and a 15% tolerance options.
ADM1810, ADM1812, ADM1815 AND ADM1817
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
The ADM1812 is a 5 V low cost voltage monitor with an active high push-pull output. The ADM1812 supports 5%, 10% and 15% tolerances. The ADM1810 is similar to the ADM1812, except that the ADM1810 has an active low push-pull output. The ADM1817 is 3.3 V voltage monitor with an active high push-pull output. The ADM1817 supports 5%, 10% and 20% tolerances. 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
0.027 (0.686) REF
ADM1810/ ADM1812/ ADM1815/ ADM1817
VCC RST/ RST
MICROPROCESSOR
RESET
GND
Figure 5. ADM1810/ADM1812/ADM1815/ADM1817 Typical Application
-4-
REV. 0
PRINTED IN U.S.A.
C3459-8-3/99
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 three different variants which allow the monitoring of a 5 V supply with a tolerance of 5%, 10% and 15%. The ADM1816 is a 3.3 V version of the ADM1811 and supports 5%, 10% and 20% tolerance options.

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