Microprocessor Supervisory Circuit in 4-Lead SOT-143 with DSP ADM811/ADM812 FEATURES FUNCTIONAL BLOCK DIAGRAM ADM811/ADM812 VCC RESET GENERATOR VREF MR RESET/RESET DEBOUNCE GND 00092-001 Superior upgrade for MAX811/MAX812 Specified over temperature Low power consumption: 5 A typical Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options Reset assertion down to 1 VCC Power-on reset: 140 ms minimum Logic low RESET output (ADM811) Logic high RESET output (ADM812) Built-in manual reset Figure 1. APPLICATIONS Microprocessor systems Controllers Intelligent instruments Automotive systems Safety systems Portable instruments GENERAL DESCRIPTION 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 are 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. MR VCC VCC ADM811 MICROPROCESSOR SYSTEM RESET RESET 100k GND GND 00092-002 The ADM811/ADM812 are reliable voltage monitoring devices suitable for use in most voltage monitoring applications. The ADM811/ADM812 are designed to monitor six different voltages, each allowing 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. Figure 2. Typical ADM811 Operating Circuit Rev. F 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. Specifications subject to change without notice. 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 owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2009 Analog Devices, Inc. All rights reserved. ADM811/ADM812 TABLE OF CONTENTS Features .............................................................................................. 1 Reset Thresholds ...........................................................................7 Applications ....................................................................................... 1 Reset Output ..................................................................................7 Functional Block Diagram .............................................................. 1 Manual Reset..................................................................................7 General Description ......................................................................... 1 Glitch Immunity ............................................................................7 Revision History ............................................................................... 2 Interfacing to Other Devices ............................................................8 Specifications..................................................................................... 3 Output .............................................................................................8 Absolute Maximum Ratings............................................................ 4 Benefits of a Very Accurate Reset Threshold ............................8 ESD Caution .................................................................................. 4 Ensuring a Valid RESET/Reset Output Down to VCC = 0 V....8 Pin Configuration and Function Descriptions ............................. 5 Outline Dimensions ..........................................................................9 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 10 Circuit Information .......................................................................... 7 REVISION HISTORY 8/09--Rev. E to Rev. F Changes to Ordering Guide .......................................................... 10 Changes to Pin Function Descriptions ...........................................4 Removed Note from Table I ............................................................6 5/08--Rev. D to Rev. E Changes to Table 2 ............................................................................ 4 Changes to Outline Dimensions..................................................... 9 Changes to Ordering Guide .......................................................... 10 1/03--Rev. A to Rev. B Added ADM812 ................................................................. Universal Changes to Specifications .................................................................2 Changes to Ordering Guide .............................................................3 Changes to Pin Configuration .........................................................4 Changes to Pin Function Description ............................................4 Additions to Table I ...........................................................................6 Changes to Manual Reset section....................................................6 5/06--Rev. C to Rev. D Changes to Ordering Guide ............................................................ 9 2/03--Rev. B to Rev. C Changes Features .............................................................................. 1 Changes to General Description .................................................... 1 Changes to Specifications ................................................................ 2 Removed Note 2 from Ordering Guide ......................................... 3 5/02--Rev. 0 to Rev. A Deletion of ADM812.......................................................... Universal Rev. F | Page 2 of 12 ADM811/ADM812 SPECIFICATIONS VCC = full operating range; TA = TMIN to TMAX; VCC typical = 5 V for L/M models, 3.3 V for T/S models, 3 V for R model, 2.5 V for Z models, unless otherwise noted. Table 1. Parameter SUPPLY Voltage Min Typ 1.0 1.2 Current RESET VOLTAGE THRESHOLD ADM81xL ADM81xL ADM81xM ADM81xM ADM81xT ADM81xT ADM81xS ADM81xS ADM81xR ADM81xR ADM81xZ ADM81xZ RESET THRESHOLD TEMPERATURE COEFFICIENT VCC TO RESET/RESET DELAY RESET ACTIVE TIMEOUT PERIOD MANUAL RESET Minimum Pulse Width Glitch Immunity RESET/RESET Propagation Delay Pull-Up Resistance The Manual Reset Circuit Acts 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) 4.54 4.50 4.30 4.25 3.03 3.00 2.88 2.85 2.58 2.55 2.28 2.25 Max Unit Test Conditions/Comments 5.5 V V A A TA = 0C to 70C TA = -40C to +85C VCC < 5.5 V, ADM81xL/M, IOUT = 0 mA VCC < 3.6 V, ADM81xR/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 560 700 V V V V V V V V V V V V ppm/C s s ms ms 30 s ns s k 8 5 15 10 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 4.38 3.08 2.93 2.63 2.32 30 40 20 140 300 10 100 0.5 20 10 2.3 0.8 0.7 x VCC 0.25 x VCC 0.3 0.4 0.8 x VCC 0.3 0.4 0.3 0.8 x VCC VCC x 1.5 Rev. F | Page 3 of 12 VOD = 125 mV, ADM81xL/M VOD = 125 mV, ADM81xR/S/T/Z VCC = VTH(MAX) ADM811-3T only V V V V VCC > VTH(MAX), ADM81xL/M VCC > VTH(MAX), ADM81xL/M VCC > VTH(MAX), ADM81xR/S/T/Z VCC > VTH(MAX), ADM81xR/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 ADM811/ADM812 ABSOLUTE MAXIMUM RATINGS Typical values are at TA = 25C, unless otherwise noted. -0.3 V to +6 V -0.3 V to VCC + 0.3 V 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 indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 20 mA 20 mA ESD CAUTION Table 2. Parameter Terminal Voltage (With Respect to Ground) VCC All Other Inputs Input Current VCC MR Output Current RESET Power Dissipation (TA = 70C) RA-4 (SOT-143) Derate by 4 mW/C Above 70C JA Thermal Impedance Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec) Vapor Phase (60 sec) Infrared (15 sec) ESD Rating Rating 20 mA 200 mW 330C/W -40C to +85C -65C to +160C 300C 215C 220C 3 kV Rev. F | Page 4 of 12 ADM811/ADM812 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS ADM811/ ADM812 4 VCC TOP VIEW RESET/RESET 2 (Not to Scale) 3 MR 00092-003 GND 1 Figure 3. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1 2 Mnemonic GND RESET (ADM811) RESET (ADM812) 3 MR 4 VCC Description Ground Reference For All Signals, 0 V. 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. 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. Manual Reset. This active low debounced input ignores 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. Monitored Supply Voltage of 2.5 V, 3 V, 3.3 V, or 5 V. Rev. F | Page 5 of 12 ADM811/ADM812 TYPICAL PERFORMANCE CHARACTERISTICS 12 10 IDD @ VCC = 5.5V 9 10 7 IDD @ VCC = 3V IDD (A) 6 4 IDD @ VCC = 3V 5 4 3 2 2 30 50 70 85 100 120 TEMPERATURE (C) 0 -40 900 800 POWER-DOWN RESET DELAY (s) 900 800 700 600 500 VOD = 20mV 300 200 VOD = 125mV VOD = 200mV 100 0 20 30 50 70 85 100 120 TEMPERATURE (C) 30 50 70 85 100 120 700 600 500 400 VOD = 20mV 300 200 VOD = 125mV 100 0 -40 00092-005 -20 20 Figure 7. Supply Current vs. Temperature (ADM81xL/M) 1000 0 -40 0 TEMPERATURE (C) Figure 4. Supply Current vs. Temperature (ADM81xR/S/T/Z) 400 -20 00092-007 20 VOD = 200mV -20 0 20 30 50 70 85 100 120 TEMPERATURE (C) Figure 5. Power-Down RESET Delay vs. Temperature (ADM81xR/S/T/Z) 00092-008 0 00092-004 -20 IDD @ VCC = 1V 1 IDD @ VCC = 1V 0 -40 POWER-DOWN RESET DELAY (s) 6 Figure 8. Power-Down RESET Delay vs. Temperature (ADM81xL/M) 299 1.007 1.006 294 NORMALIZED RESET THRESHOLD ADM81xL/M 279 274 269 264 259 254 ADM81xR/S/T/Z 249 1.005 1.004 1.003 1.002 1.002 1.001 1.000 0.999 0.998 0.997 0.996 -20 0 20 30 50 70 85 100 TEMPERATURE (C) 120 0.995 -40 00092-006 244 -40 -20 0 20 30 50 70 85 100 TEMPERATURE (C) Figure 9. RESET Threshold Deviation vs. Temperature Figure 6. Power-Up RESET Timeout vs. Temperature Rev. F | Page 6 of 12 120 00092-009 IDD (A) 8 POWER-UP RESET TIMEOUT (ms) IDD @ VCC = 5.5V 8 ADM811/ADM812 CIRCUIT INFORMATION RESET THRESHOLDS A reset output is provided to the microprocessor whenever the VCC input is below the reset threshold. The actual reset threshold depends on whether an L, M, T, S, R, or Z suffix is used (see Table 4). Table 4. Reset Threshold Options Model ADM811LART ADM811MART ADM811TART ADM811-3TART ADM811SART ADM811RART ADM811ZART ADM812LART ADM812MART ADM812TART ADM812SART ADM812RART ADM812ZART Reset Threshold (V) 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 This allows time for the power supply and microprocessor to stabilize. The ADM811 provides an active low reset output (RESET) while the ADM812 provides an active high output (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. MANUAL RESET The ADM811/ADM812 are 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 can pick up noise). 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. GLITCH IMMUNITY 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. The ADM811/ADM812 contain internal filtering circuitry providing glitch immunity from fast transient glitches on the power supply line. VCC RESET VREF VREF VREF t1 t1 t1 = RESET TIME = 250ms TYPICAL VREF = RESET VOLTAGE THRESHOLD Figure 10. Power Fall RESET Timing Rev. F | Page 7 of 12 VREF 00092-010 RESET OUTPUT ADM811/ADM812 INTERFACING TO OTHER DEVICES VCC OUTPUT The ADM811/ADM812 are 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. VCC ADM811 GND 00092-011 RESET Figure 11. Ensuring a Valid RESET Output Down to VCC = 0 V 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. ENSURING A VALID RESET/RESET OUTPUT DOWN TO VCC = 0 V When VCC falls below 0.8 V, the RESET/RESET of the ADM811/ ADM812 no longer sinks current. Therefore, a high impedance CMOS logic input connected to RESET/RESET can drift to undetermined logic levels. To eliminate this problem, a 100 k resistor should be connected from RESET/RESET to ground. Rev. F | Page 8 of 12 ADM811/ADM812 OUTLINE DIMENSIONS 1.40 1.30 1.20 4 3 1 2 2.64 2.10 1.92 BSC 1.07 0.90 0.75 1.22 0.80 0.100 0.013 0.89 0.76 0.50 0.30 0.20 0.08 SEATING PLANE 0.54 REF 0.60 0.50 0.40 COMPLIANT TO JEDEC STANDARDS TO-253-AA Figure 12. 4-Lead Small Outline Transistor Package [SOT-143] (RA-4) Dimensions shown in millimeters Rev. F | Page 9 of 12 8 0 073105-A 0.20 BSC 3.04 2.90 2.80 ADM811/ADM812 ORDERING GUIDE Model 1 ADM811LART-REEL ADM811LART-REEL7 ADM811LARTZ-REEL 2 ADM811LARTZ-REEL72 ADM811MART-REEL7 ADM811MARTZ-REEL2 ADM811MARTZ-REEL72 ADM811TART-REEL ADM811TART-REEL7 ADM811TARTZ-REEL2 ADM811TARTZ-REEL72 ADM811-3TART-REEL7 ADM811-3TARTZ-RL2 ADM811-3TARTZ-RL72 ADM811SART-REEL ADM811SART-REEL7 ADM811SARTZ-REEL2 ADM811SARTZ-REEL72 ADM811RART-REEL7 ADM811RARTZ-REEL2 ADM811RARTZ-REEL72 ADM811ZART-REEL ADM811ZART-REEL7 ADM811ZARTZ-REEL2 ADM811ZARTZ-REEL72 ADM812LART-REEL ADM812LART-REEL7 ADM812LARTZ-REEL2 ADM812LARTZ-REEL72 ADM812MART-REEL ADM812MART-REEL7 ADM812MARTZ-REEL2 ADM812MARTZ-REEL72 ADM812TART-REEL7 ADM812TARTZ-REEL2 ADM812TARTZ-REEL72 ADM812SART-REEL ADM812SART-REEL7 ADM812SARTZ-REEL2 ADM812SARTZ-REEL72 ADM812RART-REEL ADM812RART-REEL7 ADM812RARTZ-REEL2 ADM812RARTZ-REEL72 ADM812ZART-REEL ADM812ZART-REEL7 ADM812ZARTZ-REEL2 ADM812ZARTZ-REEL72 1 2 Reset Threshold (V) 4.63 4.63 4.63 4.63 4.38 4.38 4.38 3.08 3.08 3.08 3.08 3.08 3.08 3.08 2.93 2.93 2.93 2.93 2.63 2.63 2.63 2.32 2.32 2.32 2.32 4.63 4.63 4.63 4.63 4.38 4.38 4.38 4.38 3.08 3.08 3.08 2.93 2.93 2.93 2.93 2.63 2.63 2.63 2.63 2.32 2.32 2.32 2.32 Temperature Range -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 -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 Ordering Quantity 10,000 3,000 10,000 3,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 10,000 3,000 Package Description 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 4-Lead SOT-143 Available only in reels. Z = RoHS Compliant Part. RoHS-compliant parts may have # branded on either the top or bottom of the device. Rev. F | Page 10 of 12 Package Option RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 RA-4 Branding MBV MBV M4J M4J MBT MBT # MBT # MBG MBG MBG # MBG # MB3 M4E M4E MBE MBE MBE # MBE # MBB M4N M4N MBZ MBZ M6G M6G MCV MCV M5D M5D MCT MCT M6D M6D MCG M68 M68 MCE MCE M67 M67 MCB MCB M6F M6F MCZ MCZ M69 M69 ADM811/ADM812 NOTES Rev. F | Page 11 of 12 ADM811/ADM812 NOTES (c)2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00092-0-8/09(F) Rev. F | Page 12 of 12