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a FEATURES Specified Over Temperature Low Power Consumption (17 A) Precision Voltage Monitor: 3 V, 5 V Options Reset Assertion Down to 1 V VCC 30 ms min Power-On Reset Logic Low RESET Output APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems VCC VREF Microprocessor Supervisory Circuit ADM809-5S/L FUNCTIONAL BLOCK DIAGRAM ADM809-5S/L RESET GENERATOR 55ms RESET GND GENERAL DESCRIPTION VCC VCC VCC RESET INPUT P SYSTEM GND The ADM809-5S/L supervisory circuits monitor the power supply voltage in microprocessor systems. It provides a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 55 ms. This holds the microprocessor in a reset state until conditions have stabilized. The RESET output remains operational with VCC as low as 1 V. The ADM809-5S/L provides an active low reset signal (RESET). The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC. The ADM809-5S/L consumes only 17 A, making it suitable for low power portable equipment. ADM809-5S/L RESET GND Figure 1. Typical Operating Circuit 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., 2000 ADM809-5S/L-SPECIFICATIONS Models unless otherwise noted.) Parameter VCC Operating Voltage Range Min 1.0 1.2 Supply Current Typ Max 3.3 3.3 24 17 5.5 5.5 60 50 100 100 Unit V V A A A A (VCC = Full Operating Range, TA = TMIN to TMAX, VCC typ = 5 V for L, 3.3 V for S Test Conditions/Comments TA = 0C to +150C with 100 k Pull-Down on Output (Figure 3) TA = -40C to +150C with 22 k External Pull-Up on Output (Figure 6) VCC < 5.5 V, ADM8_L, TA = -40C to +85C VCC < 3.6 V, ADM8_S, TA = -40C to +85C VCC < 5.5 V, ADM8_L, TA = +85C to +150C VCC < 3.6 V, ADM8_S, TA = +85C to +150C RESET THRESHOLD Reset Voltage Threshold ADM809-5L ADM809-5L ADM809-5S ADM809-5S Reset Threshold Temperature Coefficient VCC to Reset Delay Reset Active Timeout Period RESET Output Voltage Low 4.5 4.40 2.85 2.78 30 20 30 55 4.75 4.86 3.00 3.08 V V V V TA = -40C to +85C TA = +85C to +150C TA = -40C to +85C TA = +85C to +150C ppm/C s VCC = VTH to (VTH -100 mV) 80 0.3 0.4 0.3 ms V V V V V +150 C 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 *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. TA = -40C to +150C VCC = VTH min, ISINK = 1.2 mA, ADM809-5S VCC = VTH min, ISINK = 3.2 mA, ADM809-5L VCC >1.0 V, ISINK = 50 A, TA = 0C to +150C VCC >1.2 V, ISINK = 50 A, TA = -40C to +150C VCC > VTH max, ISOURCE = 500 A VCC > VTH max, ISOURCE = 800 A RESET Output Voltage High JUNCTION TEMPERATURE ABSOLUTE MAXIMUM RATINGS* (TA = 25C unless otherwise noted) 0.8 VCC VCC - 1.5 -40 VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V RESET, RESET . . . . . . . . . . . . . . . . . . -0.3 V to VCC + 0.5 V Input Current VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Output Current RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Rate of Rise, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 V/s Power Dissipation, RT-3 SOT-23 Derate by 4 mW/C above 70C . . . . . . . . . . . . . . . 320 mW 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 ADM809-5S/L 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 -2- REV. 0 ADM809-5S/L PIN FUNCTION DESCRIPTION Pin 1 2 Mnemonic GND RESET Function 0 V. Ground reference for all signals. Active Low Logic Output. RESET remains low while VCC is below the reset threshold, and remains low for 55 ms (typ) after VCC rises above the reset threshold Supply voltage being monitored. VCC RESET VREF VREF VREF VREF t1 t1 t1 = RESET TIME = 55ms TYP. VREF = RESET VOLTAGE THRESHOLD Figure 2. Power Fail Reset Timing 3 V CC Table I. RESET Threshold Options Model PIN CONFIGURATION RESET Threshold 4.63 V 2.93 V ADM809-5LART ADM809-5SART GND 1 ADM8095S/L TOP VIEW (Not to Scale) 3 VCC RESET 2 ORDERING GUIDE Model ADM809-5LART-REEL ADM809-5LART-REEL-7 ADM809-5SART-REEL ADM809-5SART-REEL-7 ADM809-5SCHIPS Reset Threshold 4.63 V 4.63 V 2.93 V 2.93 V 2.93 V Temperature Range -40C to +150C -40C to +150C -40C to +150C -40C to +150C -40C to +150C Branding Information M9L M9L M9S M9S NA Quantity 10K 3K 10K 3K 1 Wafer REV. 0 -3- ADM809-5S/L -Typical Performance Characteristics 30 VCC = 5V 400 350 300 200 180 160 VOD = VTH - VCC VOD = 10mV 25 SUPPLY CURRENT VCC = 3V TITLE 250 200 150 100 ADM8_L/M RESET DELAY 20 15 10 5 0 -40 140 120 100 80 60 40 VOD = 100mV VOD = 200mV -20 0 20 40 60 TEMPERATURE - C 80 85 VOD = 20mV VCC = 1V -20 0 20 40 60 TEMPERATURE - C 80 85 50 ADM8_R/S/T 0 1 10 TITLE 100 1000 20 0 -40 TPC 1. Supply Current vs. Temperature (No Load) TPC 2. Maximum Transient Duration Without Causing a RESET Pulse vs. RESET Comparator Overdrive 1.002 1.0015 1.001 1.0005 1.0 TPC 3. Power-Down RESET Delay vs. Temperature ADM809-5L 180 160 140 VOD = VTH - VCC VOD = 10mV RESET DELAY 100 80 60 40 20 0 -40 VOD = 20mV VOD = 100mV THRESHOLD 80 85 120 0.9995 VOD = 200mV -20 0 20 40 60 TEMPERATURE - C 0.999 -40 -20 0 20 40 60 TEMPERATURE - C 80 85 TPC 4. Power-Down RESET Delay vs. Temperature ADM809-5S TPC 5. Normalized RESET Voltage Threshold vs. Temperature -4- REV. 0 ADM809-5S/L INTERFACING TO OTHER DEVICES OUTPUT The ADM809-5S/L is designed to integrate with as many devices as possible and therefore has an output dependant on VCC. Because of this design approach, interfacing this device to other devices is simplified. ENSURING A VALID RESET OUTPUT DOWN TO V CC = 0 V PRIORITY ENCODER 74LS147 VCC 4 LINE BCD TO P When VCC falls below 0.8 V, ADM809-5S/L's RESET no longer sinks current. A high impedance CMOS logic input connected to RESET may, therefore, drift to undetermined logic levels. To eliminate this problem a 100 k resistor should be connected from RESET to ground. VCC VCC ADM809 RESET OTHER SENSING DEVICES GND VCC Figure 4. Interfacing to Ps with Multiple Interrupts ADM809-5S/L RESET 100nF 100k VCC 47k 47k 3.3V GND RESET ADM809-5S/L GND Figure 3. Ensuring a Valid RESET Output Down to VCC = 0 V THE BENEFITS OF A VERY ACCURATE RESET THRESHOLD Figure 5. Alternative Application Circuit with Extra Decoupling In other microprocessor supervisory circuits, tolerances in supply voltages lead to an overall increase in RESET tolerance levels due to the deterioration of the microprocessor RESET circuit's power supply. The possibility of a malfunction during a power failure is greatly reduced because the ADM809-5S/L series can operate effectively even when there are large degradations of the supply voltages. Another advantage of the ADM809-5S/L series is its very accurate internal voltage reference circuit. These benefits combine to produce an exceptionally reliable Voltage Monitor Circuit. INTERFACING TO MICROPROCESSORS WITH MULTIPLE INTERRUPTS 3.3V 100nF VCC 22k RESET ADM809-5S/L GND In a number of cases it is necessary to interface many interrupts from different devices (i.e., thermal, attitude, and velocity sensors). The ADM809-5S/L can easily be integrated into existing interrupt-handling circuits (Figure 6) or used as a stand-alone device. Figure 6. Additional Decoupling Can Be Achieved Using a 100 nF Capacitor Between VCC and Ground REV. 0 -5- ADM809-5S/L OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Surface Mount Package 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 -6- REV. 0 PRINTED IN U.S.A. C00090-2.5-9/00 (rev. 0) |
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