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| a Microprocessor Supervisory Circuit in 3-Pin SOT-23 ADM809/ADM810 FUNCTIONAL BLOCK DIAGRAM ADM809/ADM810 VCC VREF FEATURES Superior Upgrade for MAX809/MAX810 Specified Over Temperature Low Power Consumption (17 A) Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options Reset Assertion Down to 1 V VCC 140 ms min Power-On Reset Logic Low RESET Output (ADM809) Logic High RESET Output (ADM810) APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Automotive Systems RESET GENERATOR 240ms RESET (RESET) GND GENERAL DESCRIPTION The ADM809/ADM810 supervisory circuits monitor the power supply voltage in microprocessor systems. They provide a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 240 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 provides an active low reset signal (RESET) while the ADM810 provides an active high signal (RESET) output. Six reset threshold voltage options are available suitable for monitoring a variety of supply voltages. Refer to Table I. The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC. The ADM809/ADM810 consumes only 17 A, making it suitable for low power portable equipment. It is packaged in a 3-pin SOT-23 package. VCC VCC VCC ADM809 RESET RESET INPUT P SYSTEM GND 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: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 (c) Analog Devices, Inc., 1997 ADM809/ADM810-SPECIFICATIONS for T/S, 3 V for R Models unless otherwise noted.) Parameter VCC Operating Voltage Range Supply Current Min 1.0 1.2 24 17 Typ Max 5.5 5.5 60 50 100 100 Units V V A A A A Test Conditions/Comments (VCC = Full Operating Range, TA = TMIN to TMAX, VCC typ = 5 V for L/M/J, 3.3 V TA = 0C to +70C TA = -40C to +105C VCC < 5.5 V, ADM8_L/M, TA = -40C to +85C VCC < 3.6 V, ADM8_R/S/T, TA = -40C to +85C VCC < 5.5 V, ADM8_L/M, TA = +85C to +105C VCC < 3.6 V, ADM8_R/S/T, TA = +85C to +105C RESET THRESHOLD Reset Voltage Threshold ADM8_L ADM8_L ADM8_L ADM8_M ADM8_M ADM8_M ADM8_ J ADM8_ J ADM8_ J ADM8_T ADM8_T ADM8_T ADM8_S ADM8_S ADM8_S ADM8_R ADM8_R ADM8_R Reset Threshold Temperature Coefficient VCC to Reset Delay Reset Active Timeout Period RESET Output Voltage Low (ADM809) 4.56 4.5 4.40 4.31 4.25 4.16 3.93 3.89 3.80 3.04 3.00 2.92 2.89 2.85 2.78 2.59 2.55 2.50 4.63 4.38 4.00 3.08 2.93 2.63 4.70 4.75 4.86 4.45 4.5 4.56 4.06 4.10 4.20 3.11 3.15 3.23 2.96 3.00 3.08 2.66 2.70 2.76 V V V V V V V V V V V V V V V V V V ppm/C s TA = +25C TA = -40C to +85C TA = +85C to +105C TA = +25C TA = -40C to +85C TA = +85C to +105C TA = +25C TA = -40C to +85C TA = +85C to +105C TA = +25C TA = -40C to +85C TA = +85C to +105C TA = +25C TA = -40C to +85C TA = +85C to +105C TA = +25C TA = -40C to +85C TA = +85C to +105C VCC = VTH to (VTH -100 mV) TA = -40C to +85C TA = +85C to +105C VCC = VTH min, ISINK = 1.2 mA, ADM809R/S/T VCC = VTH min, ISINK = 3.2 mA, ADM809L/M VCC >1.0 V, ISINK = 50 A VCC > VTH max, ISOURCE = 500 A, ADM809R/S/T VCC > VTH max, ISOURCE = 800 A, ADM809L/M VCC = VTH min, ISINK = 1.2 mA, ADM810R/S/T VCC = VTH min, ISINK = 3.2 mA, ADM810L/M 1.8 V < VCC < VTH min, ISOURCE = 150 A 30 20 140 100 240 560 840 0.3 0.4 0.3 0.8 VCC VCC-1.5 0.3 0.4 0.8 VCC ms ms V V V V V V V V RESET Output Voltage High (ADM809) RESET Output Voltage Low (ADM810) RESET Output Voltage High (ADM810) ABSOLUTE MAXIMUM RATINGS* (TA = +25C unless otherwise noted) 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 . . . . . . . . . . . . . . . . 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 *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. 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/ADM810 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/ADM810 PIN FUNCTION DESCRIPTION Pin 1 2 Mnemonic GND Function 0 V. Ground reference for all signals. VCC VREF VREF VREF VREF RESET t1 t1 RESET (ADM809) Active Low Logic Output. RESET remains low while VCC is below the reset threshold, and remains low for 240 ms (typ) after VCC rises above the reset threshold RESET (ADM810) Active High Logic Output. RESET remains high while VCC is below the reset threshold, and remains high for 240 ms (typ) after VCC rises above the reset threshold. VCC Supply voltage being monitored. PIN CONFIGURATION t1 = RESET TIME = 240ms TYP. VREF = RESET VOLTAGE THRESHOLD Figure 2. Power Fail Reset Timing Table I. Reset Threshold Options 2 Model ADM809LART ADM809MART ADM809JART ADM809TART ADM809SART ADM809RART ADM810LART ADM810MART ADM810JART ADM810TART ADM810SART ADM810RART RESET Threshold 4.63 V 4.38 V 4.00 V 3.08 V 2.93 V 2.63 V 4.63 V 4.38 V 4.00 V 3.08 V 2.93 V 2.63 V 3 GND 1 ADM809/ ADM810 RESET, RESET 2 TOP VIEW (Not to Scale) 3 VCC RESET, RESET ORDERING GUIDE Model* ADM809LART-REEL ADM809LART-REEL-7 ADM809MART-REEL ADM809MART-REEL-7 ADM809JART-REEL ADM809JART-REEL-7 ADM809TART-REEL ADM809TART-REEL-7 ADM809SART-REEL ADM809SART-REEL-7 ADM809RART-REEL ADM809RART-REEL-7 ADM810LART-REEL ADM810LART-REEL-7 ADM810MART-REEL ADM810MART-REEL-7 ADM810JART-REEL ADM810JART-REEL-7 ADM810TART-REEL ADM810TART-REEL-7 ADM810SART-REEL ADM810SART-REEL-7 ADM810RART-REEL ADM810RART-REEL-7 *Only available in Reels. Reset Threshold 4.63 V 4.63 V 4.38 V 4.38 V 4.00 V 4.00 V 3.08 V 3.08 V 2.93 V 2.93 V 2.63 V 2.63 V 4.63 V 4.63 V 4.38 V 4.38 V 4.00 V 4.00 V 3.08 V 3.08 V 2.93 V 2.93 V 2.63 V 2.63 V Temperature Range -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C -40C to +105C Brand Information 9LXX 9LXX 9MXX 9MXX 9JXX 9JXX 9TXX 9TXX 9SXX 9SXX 9RXX 9RXX ALXX ALXX AMXX AMXX AJXX AJXX ATXX ATXX ASXX ASXX ARXX ARXX Quantity 10K 3K 10K 3K 10K 3K 10K 3K 10K 3K 10K 3K 10K 3K 10K 3K 10K 3K 10K 3K 10K 3K 10K 3K REV. 0 -3- ADM809/ADM810--Typical Performance Characteristics 30 VCC = 5V 25 VCC = 3V 200 VOD = VTH - VCC 180 160 140 120 100 80 VOD = 20mV VOD = 10mV 180 160 140 120 100 80 60 VOD = VTH - VCC VOD = 10mV 20 VOD = 20mV 15 10 60 40 VCC = 1V 5 VOD = 100mV VOD = 200mV -20 0 20 40 60 TEMPERATURE - C 80 85 40 20 0 -40 VOD = 100mV VOD = 200mV -20 0 20 40 60 TEMPERATURE - C 80 85 20 80 85 0 -40 -20 0 20 40 60 TEMPERATURE - C 0 -40 Figure 3. Supply Current vs. Temperature (ADM8_L/M/R/S/T) (No Load) 240 239.5 239 238.5 238 237.5 237 Figure 4. Power-Down RESET Delay vs. Temperature ADM8_L/M 1.002 Figure 5. Power-Down RESET Delay vs. Temperature ADM8_T/S/R 1.0015 SUPPLY VOLTAGE 5VPK TO PK 1.001 T 1.0005 1 RESET OUTPUT VOLTAGE ADM809T ADM809R 1.0 236.5 236 235.5 235 -40 -20 0 20 40 60 TEMPERATURE - C 80 85 T 0.9995 0.999 -40 2 -20 0 20 40 60 TEMPERATURE - C 80 85 CH1 2.00V CH2 2.00V M 200ms CH1 2.00V Figure 6. Power-Down RESET Delay vs. Temperature ADM8_R Figure 7. Normalized RESET Voltage Threshold vs. Temperature 400 350 300 250 200 150 100 ADM8_R/S/T 50 0 1 10 100 1000 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV) Figure 8. RESET Output Voltage vs. Supply Voltage ADM8_L/M Figure 9. Maximum Transient Duration Without Causing a RESET Pulse vs. RESET Comparator Overdrive -4- REV. 0 ADM809/ADM810 INTERFACING TO OTHER DEVICES OUTPUT The ADM809/ADM810 Series is designed to integrate with as many devices as possible and therefore has a standard output dependant on VCC. This enables the part to be used in both 3 V and 5 V or any nominal voltage within the minimum and maximum specifications for 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 THE BENEFITS OF A VERY ACCURATE RESET THRESHOLD When VCC falls below 0.8 V, ADM809'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 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 and ADM810 series can operate effectively even when there are large degradations of the supply voltages. Another advantage of the ADM809 and ADM810 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 VCC In a number of cases it is necessary to interface many interrupts from different devices (i.e., thermal, attitude and velocity sensors). The ADM809 and ADM810 can easily be integrated into existing interrupt-handling circuits (Figure 11) or used as a stand-alone device. ADM809 RESET PRIORITY ENCODER 74LS147 VCC 4 LINE BCD TO P GND VCC ADM809 RESET OTHER SENSING DEVICES Figure 10. Ensuring a Valid RESET Output Down to VCC = 0 V GND Figure 11. Interfacing to Ps with Multiple Interrupts REV. 0 -5- ADM809/ADM810 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Surface Mount Package RT-3 C3047-12-4/97 0.0059 (0.150) 0.0034 (0.086) 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) 0.0040 (0.102) 0.0005 (0.013) SEATING PLANE 0.0100 (0.254) 0.027 (0.686) REF 0.0050 (0.127) -6- REV. 0 PRINTED IN U.S.A. |
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