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| Preliminary Technical Data FEATURES Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23 ADM823/ADM824/ADM825 FUNCTIONAL BLOCK DIAGRAM ADM823 VCC VREF VCC RESET GENERATOR Precision 2.5 V to 5 V power supply monitor 7 reset threshold options: 2.19 V to 4.63 V 140 ms (min) reset timeout Watchdog timer with 1.6s timeout (ADM823, ADM824) Manual reset input (ADM823, ADM825) Push-pull output stages: RESET (ADM823) RESET, RESET (ADM824/ADM825) Low power consumption (3 A) Guaranteed reset output valid to VCC = 1 V Power supply glitch immunity Specified over automotive temperature range 5-lead SC70 and SOT-23 packages RESET MR DEBOUNCE WATCHDOG DETECTOR 04534-0-001 GND WDI Figure 1. APPLICATIONS Microprocessor systems Computers Controllers Intelligent instruments Portable equipment GENERAL DESCRIPTION The ADM823/ADM824/ADM825 are supervisory circuits which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as providing power on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by means of an external push-button, through a manual reset input. The three parts feature different combinations of watchdog input, manual reset input and output stage configuration, as shown in Table 1. Each part is available in a choice of seven reset threshold options ranging from 2.19 V to 4.63 V. The reset and watchdog timeout periods are fixed at 140 ms (min) and 1.6s (typ), respectively. The ADM823/ADM824/ADM825 are available in 5-lead SC70 and SOT-23 packages and typically consume only 3 A, making them suitable for use in low power portable applications. Table 1. Selection Table Output Stage Part No. ADM823 ADM824 ADM825 Watchdog Timer Yes Yes - Manual Reset Yes - Yes RESET Push-Pull Push-Pull Push-Pull RESET - Push-Pull Push-Pull Rev.PrB 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: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved. ADM823/ADM824/ADM825 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Preliminary Technical Data Typical Performance Characteristics ..............................................7 OUTLINE DIMENSIONS ...............................................................9 Ordering Guides......................................................................... 10 Rev.PrB | Page 2 of 10 Preliminary Technical Data SPECIFICATIONS ADM823/ADM824/ADM825 VCC = 4.75 V to 5.5 V for ADM82_L, VCC = 4.5 V to 5.5 V for ADM82_M, VCC = 3.15 V to 3.6 V for ADM82_T, VCC = 3 V to 3.6 V for ADM82_S, VCC = 2.7 V to 3.6 V for ADM82_R, VCC = 2.38 V to 2.75 V for ADM82_Z, VCC = 2.25 V to 2.75 V for ADM82_Y, TA = TMIN to TMAX, unless otherwise noted Table 2. Parameter SUPPLY VCC Operating Voltage Range Supply Current Min 1 1.2 10 5 RESET THRESHOLD VOLTAGE ADM82_L ADM82_M ADM82_T ADM82_S ADM82_R ADM82_Z (SC70 only) ADM82_Y (SC70 only) RESET THRESHOLD TEMPERATURE COEFFICIENT RESET THRESHOLD HYSTERESIS RESET TIMEOUT PERIOD VCC TO RESET DELAY RESET Output Voltage 140 Typ Max 5.5 24 12 Unit V V A A Test Conditions/Comments TA = 0C to +70C TA = TMIN to TMAX WDI and MR unconnected ADM82_L/M WDI and MR unconnected ADM82_T/S/R/Z/Y TA = 25C TA = TMIN to TMAX TA = 25C TA = TMIN to TMAX TA = 25C TA = TMIN to TMAX TA = 25C TA = TMIN to TMAX TA = 25C TA = TMIN to TMAX TA = 25C TA = TMIN to TMAX TA = 25C TA = TMIN to TMAX ADM82_L/M ADM82_T/S/R/Z/Y VTH - VCC = 100 mV VCC = VTH min, ISINK = 3.2 mA, ADM82_L/M VCC = VTH min, ISINK = 1.2 mA, ADM82_T/S/R/Z/Y TA = 0C to 70C, VCC = 1 V, VCC falling, ISINK = 50 A VCC = VTH max, ISOURCE = 120 A, ADM82_L/M VCC = VTH max, ISOURCE = 30 A, ADM82_T/S/R/Z/Y RESET = 0 V, VCC = 5.5 V, ADM82_L/M RESET = 0 V, VCC = 5.5 V, ADM82_T/S/R/Z/Y VCC = VTH max, ISINK = 3.2 mA, ADM824L/M, ADM825L/M VCC = VTH max, ISINK = 1.2 mA, ADM824T/S/R/Z/Y, ADM825T/S/R/Z/Y VCC > = 1.8 V, ISOURCE = 150 A 4.56 4.50 4.31 4.25 3.04 3.00 2.89 2.85 2.59 2.55 2.28 2.25 2.16 2.13 4.63 4.38 3.08 2.93 2.63 2.32 2.19 40 10 5 200 40 4.70 4.75 4.45 4.50 3.11 3.15 2.96 3.00 2.66 2.70 2.35 2.38 2.22 2.25 280 0.4 0.3 0.3 V V V V V V V V V V V V V V ppm/C mV mV ms s V V V V V VCC - 1.5 0.8 x VCC RESET Output Short Circuit Current 800 400 RESET Output Voltage 0.4 0.3 A A V V 0.8 x VCC V Rev.PrB | Page 3 of 10 ADM823/ADM824/ADM825 Parameter WATCHDOG INPUT (ADM823, ADM824) Watchdog Timeout Period WDI Pulse Width WDI Input Threshold VIL VIH WDI Input Current MANUAL RESET INPUT (ADM823, ADM825) MR Input Threshold MR Input Pulse Width MR Glitch Rejection MR Pull-up Resistance MR to Reset Delay 0.7 x VCC 1 35 100 52 500 75 Min 1.12 50 Typ 1.6 Max 2.40 Preliminary Technical Data Unit s ns V V A A V V s ns k ns Test Conditions/Comments VIL = 0.4 V, VIH = 0.8 x V CC, 0.3 x VCC 0.7 x VCC -20 120 -15 160 VWDI = VCC, time average VWDI = 0, time average 0.3 x VCC Rev.PrB | Page 4 of 10 Preliminary Technical Data ABSOLUTE MAXIMUM RATINGS TA = 25C, unless otherwise noted. Table 3. Parameter VCC Output Current (RESET, RESET) Operating Temperature Range Storage Temperature Range JA Thermal Impedance SC70 SOT-23 Lead Temperature Soldering (10 sec) Vapor Phase (60 sec) Infrared (15 sec) Rating -0.3 V to +6 V 20 mA -40C to +125C -65C to +150C 146C/W 270C/W 300C 215C 220C ADM823/ADM824/ADM825 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and 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. ESD 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 this product 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. Rev.PrB | Page 5 of 10 ADM823/ADM824/ADM825 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS RESET 1 5 Preliminary Technical Data VCC RESET 1 5 VCC RESET 1 5 VCC ADM823 GND 2 MR 3 04534-0-002 ADM824 GND 2 4 04534-0-003 ADM825 GND 2 4 04534-0-004 TOP VIEW (Not to Scale) WDI TOP VIEW (Not to Scale) WDI TOP VIEW (Not to Scale) 4 RESET 3 RESET 3 MR Figure 2. ADM823 Pin Configuration Figure 3. ADM824 Pin Configuration Figure 4. ADM825 Pin Configuration Table 4. Pin Function Descriptions Pin. No. 1 2 3 Mnemonic RESET GND MR (ADM823) RESET (ADM824/ADM825) WDI (ADM823/ADM824) Description Push-Pull Active-Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. Ground. Manual Reset Input. This is an active-low input which, when forced low for at least 1s, generates a reset. It features a 52 k internal pull-up. Active-High, Push-Pull Reset Output. Watchdog Input. Generates a reset if the voltage on the pin remains low or high for the duration of the watchdog timeout. The timer is cleared if a logic transition occurs on this pin or if a reset is generated. Manual Reset Input. Power Supply Voltage Being Monitored. 4 5 MR (ADM825) VCC Rev.PrB | Page 6 of 10 Preliminary Technical Data TYPICAL PERFORMANCE CHARACTERISTICS 10.0 9.5 9.0 8.5 8.0 7.5 ADM823L 100 90 80 ADM823/ADM824/ADM825 VCC TO RESET DELAY (s) ADM825R 04534-0-005 70 60 50 40 30 20 10 ICC (A) 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 -40 -20 0 ADM824Y 20 40 60 TEMPERATURE (C) 80 100 120 0 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100 120 Figure 5. Supply Current vs. Temperature Figure 8. Reset Comparator Propagation Delay vs. Temperature (VCC Falling) 80 MANUAL RESET TO RESET DELAY (ns) 75 70 65 60 55 50 45 40 35 30 25 20 15 10 04534-0-006 340 320 300 280 260 240 220 200 180 160 140 120 100 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100 120 04534-0-009 04534-0-010 ICC (A) 5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 VCC (V) 3.5 4.0 4.5 5.0 5.5 Figure 6. Supply Current vs. Supply Voltage 1.05 1.04 Figure 9. Manual Reset to Reset Propagation Delay vs. Temperature (ADM823/ADM825) 250 240 230 NORMALIZED RESET THRESHOLD 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 0.95 -40 04534-0-007 RESET TIMEOUT 220 210 200 190 180 170 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100 120 -20 0 20 40 60 TEMPERATURE (C) 80 100 120 Figure 7. Normalized Reset Threshold vs. Temperature Figure 10. Reset Timeout Period vs. Temperature Rev.PrB | Page 7 of 10 04534-0-008 ADM823/ADM824/ADM825 2.0 1.8 190 180 Preliminary Technical Data TIMEOUT PERIOD (s) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 04534-0-011 MR MINIMUM PULSE WIDTH (ns) 1.6 170 160 150 140 130 120 110 100 -50 04534-0-013 0 -40 -20 0 25 60 TEMPERATURE 85 125 0 50 TEMPERATURE (C) 100 Figure 11. Watchdog Timeout Period vs. Temperature (ADM823/ADM824) 160 140 Figure 13. Manual Reset Minimum Pulse Width vs. Temperature (ADM823/ADM825) 3.8 3.6 MAXIMUM TRANSIENT DURATION (s) MINIMUM PULSE WIDTH (ns) 120 100 80 60 40 20 0 10 3.4 3.2 3.0 2.8 2.6 2.4 2.2 NEGATIVE PULSE VTH = 4.9V POSITIVE PULSE VTH = 2.93V 04534-0-012 100 OVER DRIVE VOD (mV) 1000 2.0 -40 10 60 TEMPERATURE (C) 110 160 Figure 12. Maximum VCC Transient Duration vs. Reset Threshold Overdrive Figure 14. Watchdog Input Minimum Pulse Width vs. Temperature (ADM823/ADM824) Rev.PrB | Page 8 of 10 04534-0-014 Preliminary Technical Data OUTLINE DIMENSIONS 2.00 BSC 5 4 ADM823/ADM824/ADM825 1.25 BSC 1 2 3 2.10 BSC PIN 1 1.00 0.90 0.70 0.65 BSC 1.10 MAX 0.22 0.08 0.30 0.15 SEATING PLANE 8 4 0 0.46 0.36 0.26 0.10 MAX 0.10 COPLANARITY COMPLIANT TO JEDEC STANDARDS MO-203AA Figure 15. 5-Lead Plastic Surface-Mount Package [SC-70] (KS-5) Dimensions shown in millimeters 2.90 BSC 5 4 1.60 BSC 1 2.80 BSC 2 3 PIN 1 0.95 BSC 1.30 1.15 0.90 1.90 BSC 1.45 MAX 0.22 0.08 10 5 0 0.60 0.45 0.30 0.15 MAX 0.50 0.30 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-178AA Figure 16. 5-Lead Small Outline Transistor Package [SOT-23] (RJ-5) Dimensions shown in millimeters Rev.PrB | Page 9 of 10 ADM823/ADM824/ADM825 ORDERING GUIDES Table 5. ADM823 Ordering Guide Model ADM823LYKS-R7 ADM823LYRT-R7 ADM823MYKS-R7 ADM823MYRT-R7 ADM823TYKS-R7 ADM823TYRT-R7 ADM823SYKS-R7 ADM823SYRT-R7 ADM823RYKS-R7 ADM823RYRT-R7 ADM823ZYKS-R7 ADM823YYKS-R7 Reset Threshold (V) 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.19 Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Quantity 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k Preliminary Technical Data Package Type SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SC70-5 Branding N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 Table 6. ADM824 Ordering Guide Model1 ADM824LYKS-R7 ADM824LYRT-R7 ADM824MYKS-R7 ADM824MYRT-R7 ADM824TYKS-R7 ADM824TYRT-R7 ADM824SYKS-R7 ADM824SYRT-R7 ADM824RYKS-R7 ADM824RYRT-R7 ADM824ZYKS-R7 ADM824YYKS-R7 Reset Threshold (V) 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.19 Temperature Range -40C to +85C -40C to +125C -40C to +85C -40C to +125C -40C to +85C -40C to +125C -40C to +85C -40C to +125C -40C to +85C -40C to +125C -40C to +85C -40C to +85C Quantity 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k Package Type SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SC70-5 Branding N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 1 All of the ADM824 models are nonstandard. Contact factory for availability of nonstandard models. Table 7. ADM825 Ordering Guide Model1 ADM825LYKS-R7 ADM825LYRT-R7 ADM825MYKS-R7 ADM825MYRT-R7 ADM825TYKS-R7 ADM825TYRT-R7 ADM825SYKS-R7 ADM825SYRT-R7 ADM825RYKS-R7 ADM825RYRT-R7 ADM825ZYKS-R7 ADM825YYKS-R7 Reset Threshold (V) 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.19 Temperature Range -40C to +85C -40C to +125C -40C to +85C -40C to +125C -40C to +85C -40C to +125C -40C to +85C -40C to +125C -40C to +85C -40C to +125C -40C to +85C -40C to +85C Quantity 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k 3k Package Type SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SOT-23-5 SC70-5 SC70-5 Branding N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 (c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR04534-0-6/04(PrB) Rev.PrB | Page 10 of 10 |
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