Microprocessor Supervisory Circuit in 4-Lead SOT-143 ADM811/ADM812 FEATURES Superior Upgrade for MAX811/MAX812 Specified over Temperature Low Power Consumption (5 A Typ) Precision Voltage Monitor: 2.5 V, 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 (ADM811) Logic High RESET Output (ADM812) Built-In Manual Reset FUNCTIONAL BLOCK DIAGRAM ADM811/ADM812 VCC RESET GENERATOR VREF MR RESET/RESET DEBOUNCE GND APPLICATIONS Microprocessor Systems Controllers Intelligent Instruments Automotive Systems Safety Systems Portable Instruments GENERAL DESCRIPTION The ADM811/ADM812 is a reliable voltage monitoring device suitable for use in most voltage monitoring applications. The ADM811/ADM812 is designed to monitor six different voltages, each allowing for a 5% or 10% degradation of standard PSU voltages before a reset occurs. These voltages have been selected for the effective monitoring of 2.5 V, 3 V, 3.3 V, and 5 V supply voltage levels. Included in this circuit is a debounced manual reset input. Reset can be activated using an electrical switch (or an input from another digital device) or by a degradation of the supply voltage. The manual reset function is very useful, especially if the circuit in which the ADM811/ADM812 is operating enters into a state that can only be detected by the user. Allowing the user to reset a system manually can reduce the damage or danger that could otherwise be caused by an out-of-control or locked system. VCC VCC ADM811 MR MICROPROCESSOR SYSTEM RESET RESET 100k GND GND Figure 1. Typical ADM811 Operating Circuit REV. C 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 (c) 2003 Analog Devices, Inc. All rights reserved. (VCC = Full Operating Range; TA = TMIN to TMAX; VCC typ = 5 V for L/M, ADM811/ADM812-SPECIFICATIONS 3.3 V for T/S, 3 V for R, 2.5 V for Z Models; unless otherwise noted.) Parameter SUPPLY Voltage Min 1.0 1.2 Current RESET VOLTAGE THRESHOLD ADM81_L ADM81_L ADM81_M ADM81_M ADM81_T ADM81_T ADM81_S ADM81_S ADM81_R ADM81_R ADM81_Z ADM81_Z 4.54 4.50 4.30 4.25 3.03 3.00 2.88 2.85 2.58 2.55 2.28 2.25 RESET THRESHOLD TEMPERATURE COEFFICIENT VCC TO RESET/RESET DELAY RESET ACTIVE TIMEOUT PERIOD MANUAL RESET Minimum Pulsewidth Glitch Immunity RESET/RESET Propagation Delay Pull-Up Resistance The Manual Reset Circuit Will Act On: An Input Rising Above An Input Falling Below An Input Rising Above An Input Falling Below RESET/RESET Output Voltage Low (ADM812R/S/T/Z) Low (ADM812L/M) High (ADM812R/S/T/Z/L/M) Low (ADM811R/S/T/Z) Low (ADM811L/M) Low (ADM811R/S/T/Z/L/M) High (ADM811R/S/T/Z) High (ADM811L/M) Typ Max Unit Test Conditions/Comments 5.5 TA = 0C to 70C TA = -40C to +85C VCC < 5.5 V, ADM81_L/M, IOUT = 0 mA VCC < 3.6 V, ADM81_R/S/T/Z, IOUT = 0 mA TA = 25C TA = -40C to +85C TA = 25C TA = -40C to +85C TA = 25C TA = -40C to +85C TA = 25C TA = -40C to +85C TA = 25C TA = -40C to +85C TA = 25C TA = -40C to +85C 8 5 15 10 V V A A 4.63 4.72 4.75 4.46 4.50 3.14 3.15 2.98 3.00 2.68 2.70 2.35 2.38 V V V V V V V V V V V V 4.38 3.08 2.93 2.63 2.32 30 ppm/C 40 20 s s VOD = 125 mV, ADM81_L/M VOD = 125 mV, ADM81_R/S/T/Z 560 700 ms ms VCC = VTH(MAX) (ADM811-3T Only) 30 s ns s k 140 300 10 10 100 0.5 20 2.3 0.8 0.7 VCC 0.25 VCC 0.3 0.4 0.8 VCC 0.3 0.4 0.3 0.8 VCC VCC - 1.5 V V V V VCC > VTH(MAX), ADM81_L/M VCC > VTH(MAX), ADM81_L/M VCC > VTH(MAX), ADM81_R/S/T/Z VCC > VTH(MAX), ADM81_R/S/T/Z V V V V V V V V VCC = VTH(MAX), ISINK = 1.2 mA VCC = VTH(MAX), ISINK = 3.2 mA 1.8 V < VCC < VTH(MIN), ISOURCE = 150 A VCC = VTH(MIN), ISINK = 1.2 mA VCC = VTH(MIN), ISINK = 3.2 mA VCC > 1.0 V, ISINK = 50 A VCC > VTH(MAX), ISOURCE = 500 A VCC > VTH(MAX), ISOURCE = 800 A Specifications subject to change without notice. -2- REV. C ADM811/ADM812 Operating Temperature Range . . . . . . . . . . . . -40C to +85C Storage Temperature Range . . . . . . . . . . . . . -65C to +160C Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300C Vapor Phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215C Infrared (15 secs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220C ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 kV ABSOLUTE MAXIMUM RATINGS* (Typical values are at T A = 25C, unless otherwise noted.) Terminal Voltage (With Respect to Ground) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to +6 V All Other Inputs . . . . . . . . . . . . . . . . . -0.3 V to VCC + 0.3 V Input Current VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA MR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Output Current RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Power Dissipation (TA = 70C) RT-4, (SOT-143) . . . . . . . . . . . . . . . . . . . . . . . . . . 200 mW Derate by 4 mW/C above 70C JA Thermal Impedance . . . . . . . . . . . . . . . . . . . . . 330C/W *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. ORDERING GUIDE Model* Reset Threshold (V) Temperature Range Branding Information Quantity (K) ADM811LART-REEL ADM811LART-REEL-7 ADM811MART-REEL ADM811MART-REEL-7 ADM811TART-REEL ADM811TART-REEL-7 ADM811-3TART-REEL ADM811-3TART-REEL-7 ADM811SART-REEL ADM811SART-REEL-7 ADM811RART-REEL ADM811RART-REEL-7 ADM811ZART-REEL ADM811ZART-REEL-7 ADM812LART-REEL ADM812LART-REEL-7 ADM812MART-REEL ADM812MART-REEL-7 ADM812TART-REEL ADM812TART-REEL-7 ADM812SART-REEL ADM812SART-REEL-7 ADM812RART-REEL ADM812RART-REEL-7 ADM812ZART-REEL ADM812ZART-REEL-7 4.63 4.63 4.38 4.38 3.08 3.08 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.32 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.32 -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C MBV MBV MBT MBT MBG MBG MB3 MB3 MBE MBE MBB MBB MBZ MBZ MCV MCV MCT MCT MCG MCG MCE MCE MCB MCB MCZ MCZ 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 10 3 *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 ADM811/ADM812 feature 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. C -3- ADM811/ADM812 PIN CONFIGURATION GND 1 ADM811/ ADM812 4 VCC TOP VIEW RESET/RESET 2 (Not to Scale) 3 MR PIN FUNCTION DESCRIPTIONS Pin Mnemonic 1 2 3 4 Function GND 0 V. Ground reference for all signals. RESET (ADM811) Active Low Logic Output. RESET remains low while VCC is below the reset threshold or when MR is low; RESET then remains low for at least 140 ms (at least 300 ms for the ADM811-3T) after VCC rises above the reset threshold. RESET (ADM812) Active High Logic Output. RESET remains high while VCC is below the reset threshold or when MR is low; RESET then remains high for 240 ms (typical) after VCC rises above the reset threshold. MR Manual Reset. This active low debounced input will ignore input pulses of 100 ns or less (typical) and is guaranteed to accept input pulses of greater than 10 s. Leave floating when not used. VCC 2.5 V, 3 V, 3.3 V, or 5 V Monitored Supply Voltage. -4- REV. C Typical Performance Characteristics--ADM811/ADM812 10 12 9 IDD @ VCC = 5.5V IDD @ VCC = 5.5V 10 8 7 IDD @ VCC = 3V IDD - A IDD - A 8 6 IDD @ VCC = 3V 6 5 4 4 3 IDD @ VCC = 1V 2 IDD @ VCC = 1V 2 1 0 -40 -20 0 20 30 50 70 85 100 0 -40 120 -20 0 20 TEMPERATURE - C TPC 1. Supply Current vs. Temperature (ADM81_R/S/T/Z) 800 POWER-DOWN RESET DELAY - s 900 POWER-DOWN RESET DELAY - s 900 800 700 600 500 400 VOD = 20mV 200 VOD = 200mV 0 -40 -20 0 20 30 50 70 85 100 120 VOD = 20mV 400 300 200 VOD = 125mV 20 30 50 70 85 100 120 TEMPERATURE - C TPC 5. Power-Down RESET Delay vs. Temperature (ADM81_L/M) 1.007 289 1.006 284 ADM81_L/M NORMALIZED RESET THRESHOLD POWER-UP RESET TIMEOUT - ms 100 500 VOD = 200mV 0 -40 -20 0 120 TPC 2. Power-Down RESET Delay vs. Temperature (ADM81_R/S/T/Z) 279 274 269 264 259 254 ADM81_R/S/T/Z 249 1.005 1.004 1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 -20 0 20 30 50 70 85 100 0.995 -40 120 -20 0 20 30 50 70 85 100 120 TEMPERATURE - C TEMPERATURE - C TPC 3. Power-Up Reset Timeout vs. Temperature REV. C 85 600 TEMPERATURE - C 244 -40 70 700 100 VOD = 125mV 100 50 TPC 4. Supply Current vs. Temperature (ADM81_L/M) 1000 300 30 TEMPERATURE - C TPC 6. Reset Threshold Deviation vs. Temperature -5- ADM811/ADM812 CIRCUIT INFORMATION Reset Thresholds Glitch Immunity The ADM811/ADM812 contains internal filtering circuitry providing glitch immunity from fast transient glitches on the power supply line. A reset output is provided to the microprocessor whenever the VCC input is below the reset threshold. The actual reset threshold is dependent on whether an L, M, T, S, R, or Z suffix is used. Refer to Table I. VCC Table I. Reset Threshold Options Model ADM811LART ADM811MART ADM811TART ADM811-3TART ADM811SART ADM811RART ADM811ZART ADM812LART ADM812MART ADM812TART ADM812SART ADM812RART ADM812ZART RESET Reset Threshold (V) VREF VREF VREF VREF t1 t1 t1 = RESET TIME = 240ms TYPICAL VREF = RESET VOLTAGE THRESHOLD 4.63 4.38 3.08 3.08 2.93 2.63 2.32 4.63 4.38 3.08 2.93 2.63 2.32 Figure 2. Power Fail RESET Timing INTERFACING TO OTHER DEVICES Output The ADM811/ADM812 is designed to integrate with as many devices as possible. One feature of the ADM811/ADM812 is the reset output, which is directly proportional to VCC (this is guaranteed only while VCC is greater than 1 V). This enables the part to be used with both 3 V and 5 V, or any nominal voltage within the minimum and maximum specifications for VCC. BENEFITS OF A VERY ACCURATE RESET THRESHOLD Because the ADM811/ADM812 can operate effectively even when there are large degradations of the supply voltages, the possibility of a malfunction during a power failure is greatly reduced. Another advantage of the ADM811/ADM812 is its very accurate internal voltage reference circuit. Combined, these benefits produce an exceptionally reliable microprocessor supervisory circuit. RESET OUTPUT On power-up and after VCC rises above the reset threshold, an internal timer holds the reset output active for 240 ms (typical). This is intended as a power-on reset signal for the processor. It allows time for both the power supply and the microprocessor to stabilize after power-up. If a power supply brownout or interruption occurs, the reset output is similarly activated and remains active for 240 ms (typical) after the supply recovers. This allows time for the power supply and microprocessor to stabilize. VCC VCC ADM811 The ADM811 provides an active low reset output (RESET) while the ADM812 provides an active high output (RESET). RESET During power-down of the ADM811, the RESET output remains valid (low) with VCC as low as 1 V. This ensures that the microprocessor is held in a stable shutdown condition as the supply falls and also ensures that no spurious activity can occur via the microprocessor as it powers up. GND Figure 3. Ensuring a Valid RESET Output Down to VCC = 0 V MANUAL RESET ENSURING A VALID RESET OUTPUT DOWN TO VCC = 0 V The ADM811/ADM812 is equipped with a manual reset input. This input is designed to operate in a noisy environment where unwanted glitches could be induced. These glitches could be produced by the bouncing action of a switch contact, or where a manual reset switch may be located some distance away from the circuit (the cabling of which may pick-up noise). When VCC falls below 0.8 V, the ADM811/ADM812's RESET no longer sinks current. Therefore, a high impedance CMOS logic input connected to RESET may drift to undetermined logic levels. To eliminate this problem, a 100 k resistor should be connected from RESET to ground. The manual reset input is guaranteed to ignore logically valid inputs that are faster than 100 ns and to accept inputs longer in duration than 10 s. -6- REV. C ADM811/ADM812 OUTLINE DIMENSIONS 4-Lead Small Outline Transistor Package [SOT-143] (RT-4) Dimensions shown in millimeters 1.92 BSC 4 3 2.64 2.10 1.40 1.20 1 PIN 1 2 0.20 BSC 3.04 2.80 1.22 0.80 0.15 0.05 SEATING PLANE 0.89 0.76 0.45 0.30 0.20 0.08 COMPLIANT TO JEDEC STANDARDS TO-253D REV. C -7- 8 0 0.60 0.40 ADM811/ADM812 Revision History Location Page 2/03--Data Sheet changed from REV. B to REV. C. Changes to GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Changes to SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Removed Note 2 from ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Changes to PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Removed Note from Table I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 C00092-0-2/03(C) Changes FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1/03--Data Sheet changed from REV. A to REV. B. Added ADM812 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal Changes SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Changes to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Changes to PIN CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Changes to PIN FUNCTION DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Additions to Table I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Changes to Manual Reset section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5/02--Data Sheet changed from REV. 0 to REV. A. PRINTED IN U.S.A. Deletion of ADM812 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Universal -8- REV. C