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 a 3-Lead SOT-23 Package APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems FUNCTIONAL BLOCK DIAGRAMS ADM1810/ADM1815 VCC RST VCC TOLERANCE BIAS GND VCC 150ms DELAY TC REFERENCE ADM1811/ADM1816 5.5k⍀ RST VCC TOLERANCE BIAS GND 150ms DELAY TC REFERENCE 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. ADM1812/ADM1817 VCC RST VCC TOLERANCE BIAS GND 150ms DELAY TC REFERENCE ADM1813/ADM1818 VCC RESET MONITOR VCC TOLERANCE BIAS GND 5.5k⍀ RST 150ms DELAY TC REFERENCE REV. B 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 companies. 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 (VCC = Full Operating Range, TA = –40ⴗC to +105ⴗC, unless otherwise noted.) Parameter SUPPLY Voltage Min Typ Max Unit Conditions/Note 9 4 5.5 5.5 16 10 V V µA µA TA = 0˚C to 105˚C TA = –40˚C to +105˚C VCC = 5.5 V, VCC > VTH, No Load VCC = 3.6 V, VCC > VTH, No Load VCC ≥ VTH (Max), Reset Not Asserted (ADM1810/ADM1815) VCC ≤ VTH (Min), Reset Asserted (ADM1812/ADM1817) VCC ≥ 2.7 V, Reset Asserted, VOUT = 0.4 V, (ADM1810/ ADM1811/ADM1813/ADM1815/ ADM1816/ADM1818) VCC ≥ 2.7 V, Reset Not Asserted, VOUT = 0.4 V (ADM1812/ADM1817) 1 1.2 Current OUTPUT CURRENT RST Output Source Current 350 µA RST Output Source Current 350 µA RST Output Sink Current 8 mA RST Output Sink Current 8 mA OUTPUT VOLTAGE 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 ADM1815-10, ADM1816-10 ADM1817-10, ADM1818-10 ADM1815-20, ADM1816-20 ADM1817-20, ADM1818-20 ADM1815-R23, ADM1816-R23 ADM1817-R23 ADM1815-R22, ADM1816-R22 ADM1817-R22 INTERNAL PULL-UP RESISTOR ADM1811/ADM1816 ADM1813/ADM1818 VCC – 0.5 VCC – 0.1 4.50 4.62 4.75 V 4.25 4.35 4.49 V 2.98 2.80 3.06 2.88 3.15 2.97 V V 2.47 2.55 2.64 V 2.25 2.31 2.37 V 2.12 2.18 2.25 V 3.5 3.1 5.5 5.5 7.5 7.5 kΩ kΩ 10 pF 150 250 ms 5 10 µs 7 15 µs 150 250 ms (ADM1810/ADM1811/ADM1812/ ADM1813) (ADM1815/ADM1816/ADM1817/ ADM1818) tR = 5 µs µs (ADM1813/ADM1818) ms (ADM1813/ADM1818) OUTPUT CAPACTANCE RESET ACTIVE TIME 100 VCC DETECT TO RESET Falling Rising 100 PUSH-BUTTON DETECT TO RST 1 PUSH-BUTTON RESET 100 150 V 250 (ADM1810/ADM1812/ADM1815/ ADM1817) @ 0 µA to 500 µA Specifications subject to change without notice. –2– REV. B ADM1810–ADM1813/ADM1815–ADM1818 ABSOLUTE MAXIMUM RATINGS* PIN CONFIGURATION (TA = 25∞C, unless otherwise noted.) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –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 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 RST/RST 1 ADM181x TOP VIEW (Not to Scale) 3 GND VCC 2 PIN FUNCTION DESCRIPTIONS *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 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. 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. 2 VCC Supply voltage being monitored. 3 GND 0 V. Ground reference for all signals. ORDERING GUIDE Model* Trip Point Package Option Brand Info. Model* Trip Point Package Option Brand Info. 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 ADM1815-5ART-REEL ADM1815-5ART-RL7 ADM1815-10ART-REEL ADM1815-10ART-RL7 ADM1815-20ART-REEL ADM1815-20ART-RL7 ADM1815-R23ART-REEL ADM1815-R23ART-RL7 ADM1815-R22ART-REEL 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 3.06 V 3.06 V 2.88 V 2.88 V 2.55 V 2.55 V 2.31 V 2.31 V 2.18 V 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) MZV MZV MZT MZT M1V M1V M1T M1T MTV MTV MTT MTT M3V M3V M3T M3T M5K M5K M5E M5E M5A M5A M5C M5C M5B ADM1815-R22ART-RL7 ADM1816-5ART-REEL ADM1816-5ART-RL7 ADM1816-10ART-REEL ADM1816-10ART-RL7 ADM1816-20ART-REEL ADM1816-20ART-RL7 ADM1816-R23ART-REEL ADM1816-R23ART-RL7 ADM1816-R22ART-REEL ADM1816-R22ART-RL7 ADM1817-5ART-REEL ADM1817-5ART-RL7 ADM1817-10ART-REEL ADM1817-10ART-RL7 ADM1817-20ART-REEL ADM1817-20ART-RL7 ADM1817-R23ART-REEL ADM1817-R23ART-RL7 ADM1817-R22ART-REEL ADM1817-R22ART-RL7 ADM1818-10ART-REEL ADM1818-10ART-RL7 ADM1818-20ART-REEL ADM1818-20ART-RL7 2.18 V 3.06 V 3.06 V 2.88 V 2.88 V 2.55 V 2.55 V 2.31 V 2.31 V 2.18 V 2.18 V 3.06 V 3.06 V 2.88 V 2.88 V 2.55 V 2.55 V 2.31 V 2.31 V 2.18 V 2.18 V 2.88 V 2.88 V 2.55 V 2.55 V 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) M5B M6K M6K M6E M6E M6A M6A M6C M6C M6B M6B M7K M7K M7E M7E M7A M7A M7C M7C M7B M7B M8E M8E M8A M8A *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. REV. B –3– ADM1810–ADM1813/ADM1815–ADM1818–Typical Performance Characteristics 1.011 10 NORMALIZED RESET THRESHOLD ICC @VCC = 5.5V ICC – A 8 6 ICC @VCC = 3V 4 2 1.009 1.007 1.005 DEVIATION (RISE) 1.003 1.001 DEVIATION (FALL) 0.999 0.997 0 –40 –20 0 20 30 50 70 85 TEMPERATURE – ⴗC 100 0.995 –40 120 TPC 1. Supply Current vs. Temperature –20 0 20 30 50 70 85 TEMPERATURE – ⴗC 100 120 TPC 4. Normalized Reset Threshold vs. Temperature 60 900 50 700 MAX TRANSIENT – s POWER-DOWN RESET DELAY – s 800 600 500 VOD = 20mV 400 300 VOD = 125mV 40 30 20 200 10 100 VOD = 200mV 0 –40 –20 0 20 30 50 70 85 TEMPERATURE – ⴗC 100 0 10 120 30 40 60 80 100 200 400 600 800 1000 VTH – VCC – mV TPC 2. Power-Down Reset Delay vs. Temperature TPC 5. Maximum Transient Duration without Causing a Reset Pulse vs. Reset Comparator Overdrive 380 POWER-UP RESET TIMEOUT – ms 370 360 350 340 330 320 310 300 290 –40 –20 0 20 30 50 70 85 TEMPERATURE – ⴗC 100 120 TPC 3. Power-Up Reset Timeout vs. Temperature –4– REV. B ADM1810–ADM1813/ADM1815–ADM1818 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. VCC VCC TRIP POINT(MAX) VCC TRIP POINT VCC TRIP POINT(MIN) VCC TO RESET DELAY RST 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. VOL Figure 1. Power-Down Timing Diagram 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. VCC TRIP POINT (MAX) VCC TRIP POINT VCC TRIP POINT (MIN) VCC The ADM1810/ADM1812/ADM1815/ADM1817 can be connected directly to most microprocessor reset inputs without the need for external components. RESET ACTIVE TIMEOUT VCC RST ADM1810/ ADM1812/ ADM1815/ ADM1817 Figure 2. Power-Up Timing Diagram ADM1813 AND ADM1818 VCC The ADM1813 and ADM1818 are low cost voltage monitoring devices featuring an open-drain output and optional pushbutton reset function. RST/RST GND RESET Figure 5. ADM1810/ADM1812/ADM1815/ADM1817 Typical Application VCC ADM1813/ ADM1818 VCC RST MICROPROCESSOR ADM1811 AND ADM1816 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. RESET GND VCC 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 ms, then, when the reset button releases the RST line to float high, the RST line will stay low for a further 150 ms typical. ADM1811/ ADM1816 MICROPROCESSOR VCC RST RESET GND Figure 6. ADM1811/ADM1816 Typical Application PUSH-BUTTON TIME RESET TIMEOUT VOLTAGE INPUT HIGH VOLTAGE INPUT LOW Figure 4. Push-Button Reset Timing Diagram REV. B MICROPROCESSOR –5– ADM1810–ADM1813/ADM1815–ADM1818 OUTLINE DIMENSIONS 3-Lead Small Outline Transistor Package [SOT-23] (RT-3) Dimensions shown in millimeters 3.04 2.90 2.80 1.40 1.30 1.20 3 1 2.64 2.10 2 PIN 1 0.95 BSC 1.90 BSC 1.12 0.89 0.10 0.01 SEATING PLANE 0.50 0.30 0.60 0.50 0.40 0.20 0.08 0.69 REF COMPLIANT TO JEDEC STANDARDS TO-236AB –6– REV. B ADM1810–ADM1813/ADM1815–ADM1818 Revision History Location Page 2/03 Data Sheet changed from 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 Data Sheet changed from REV. O to REV. A. Addition of Table I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Addition of new text to ADM1813 and ADM1818 section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 REV. B –7– –8– PRINTED IN U.S.A. C00064–0–2/03(B)