a Microprocessor Reset Circuits ADM1810–ADM1813/ADM1815–ADM1818 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 FUNCTIONAL BLOCK DIAGRAMS ADM1810/ADM1815 VCC RST VCC TOLERANCE BIAS GND 150ms DELAY TC REFERENCE ADM1812/ADM1817 VCC 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. ADM1813/ADM1818 VCC RESET MONITOR VCC TOLERANCE BIAS GND 5.5kV RST 150ms DELAY TC REFERENCE The ADM181x series of microprocessor reset circuits are available in low cost, space-saving SOT-23 packages. ADM1811/ADM1816 VCC 5.5kV RST VCC TOLERANCE BIAS GND 150ms DELAY TC REFERENCE 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 © Analog Devices, Inc., 1999 ADM1810–ADM1813/ADM1815–ADM1818–SPECIFICATIONS (TA = –40ⴗC to +85ⴗC unless otherwise noted) Parameter Min SUPPLY Voltage Current 1.2 OUTPUT CURRENT 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 Typ Max Units 30 5.5 40 V µA 30 28 40 35 µA µA (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 350 mA µA @ 0.4 V, VCC ≥ 2.7 V* (ADM1810/ADM1812/ADM1815/ADM1817) @ 2.4 V, VCC ≥ 2.7 V VCC – 0.5 VCC – 0.1 V (ADM1810/ADM1812/ADM1815/ADM1817) @ 0 µA to 500 µA 4.50 4.25 4.00 4.62 4.35 4.13 4.75 4.49 4.24 V V V (5%) (10%) (15%) 2.98 3.06 3.15 V (5%) 2.80 2.88 2.97 V (10%) 2.47 2.55 2.64 V (20%) 3.5 5.5 7.5 kΩ 10 pF 8 OUTPUT CAPACITANCE RESET ACTIVE TIME 100 150 300 ms 100 5 7 150 10 15 300 µs µs ms (ADM1810/ADM1811/ADM1812/ADM1813) (ADM1815/ADM1816/ADM1817/ADM1818) tR = 5 µs µs (ADM1813/ADM1818) ms ms (ADM1818) 2.7 V ≤ VCC ≤ 3.3 V (ADM1813) VCC DETECT TO RST Falling Rising PUSH-BUTTON DETECT TO RST Test Conditions/Note 1 PUSH-BUTTON RESET 100 100 150 150 300 300 NOTES *For ADM181x-20, V CC = VCCTP, sink current reduces to 8 mA. Specifications subject to change without notice. –2– REV. 0 ADM1810–ADM1813/ADM1815–ADM1818 ORDERING GUIDE PIN CONFIGURATION Model* TripPoint Package Option Brand Information 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 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 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) 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 RST/RST 1 ADM181x TOP VIEW 3 GND (Not to Scale) VCC 2 PIN FUNCTION DESCRIPTIONS Pin Mnemonic Function 1 RST/RST 2 3 VCC GND 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. 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. VCC TRIP-POINT (MAX) ABSOLUTE MAXIMUM RATINGS* VCC TRIP-POINT VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +1.2 V to +5.5 V Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 µA Operating Temperature Range . . . . . . . . . . . –40°C to +85°C Power Dissipation, RT-3, SOT-23 . . . . . . . . . . . . . . 320 mW Derate by 4 mW/°C Above +70°C θJA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . . 333°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 ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 kV VCC TRIP-POINT (MIN) VCC RST Figure 2. Power-Up Timing Diagram *Typical values are measured at T A = +25°C unless otherwise noted. REV. 0 RESET ACTIVE TIMEOUT –3– 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. 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. VCC ADM1813/ ADM1818 MICROPROCESSOR VCC RST VCC RESET ADM1811/ ADM1816 MICROPROCESSOR GND C3459–8–3/99 ADM1810–ADM1813/ADM1815–ADM1818 VCC RST RESET GND Figure 3. ADM1813/ADM1818 Typical Application Figure 6. ADM1811/ADM1816 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. OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 3-Lead Plastic Surface Mount Package (SOT-23) (RT-3) PUSH-BUTTON TIME RESET TIMEOUT 0.1200 (3.048) 0.1102 (2.799) VOLTAGE INPUT HIGH VOLTAGE INPUT LOW 0.0550 (1.397) 0.0470 (1.194) Figure 4. Push-Button Reset Timing Diagram 3 1 2 0.1040 (2.642) 0.0827 (2.101) PIN 1 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. 0.0236 (0.599) 0.0177 (0.450) 0.0413 (1.049) 0.0374 (0.950) 0.0807 (2.050) 0.0701 (1.781) 0.0040 (0.102) 0.0005 (0.013) ADM1810, ADM1812, ADM1815 AND ADM1817 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. 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) 0.027 (0.686) REF PRINTED IN U.S.A. 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 ADM1810/ ADM1812/ ADM1815/ ADM1817 VCC RST/ RST MICROPROCESSOR RESET GND Figure 5. ADM1810/ADM1812/ADM1815/ADM1817 Typical Application –4– REV. 0