Preliminary Technical Data Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 & SOT-23 ADM823-ADM825 FEATURES FUNCTIONAL BLOCK DIAGRAM Precision 2.5V to 5V Power Supply Monitor 7 Reset Threshold Options: 2.19V to 4.63V 140ms (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 (3A) Guaranteed Reset Output valid to VCC=1V Power Supply Glitch Immunity Specified Over Industrial Temperature Range 5-Lead SC70 and SOT-23 Packages VCC ADM823 VCC RESET GENERATOR VREF MR RESET DEBOUNCE WATCHDOG DETECTOR GND WDI APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Portable Equipment GENERAL DESCRIPTION The ADM823-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 7 reset threshold options ranging from 2.19V to 4.63V. The reset and watchdog timeout periods are fixed at 140ms (min) and 1.6s (typ), respectively. The ADM823-ADM825 are available in 5-lead SC70 and SOT-23 packages and typically consume only 3A, making them suitable for use in low power portable applications. Table 1. Selection Table Part No. Watchdog Timer Manual Reset ADM823 ADM824 ADM825 Yes Yes - Yes Yes Output Stage RESET RESET Push-Pull Push-Pull Push-Pull Push-Pull Push-Pull Rev. PrA 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 companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. www.analog.com Tel: 781.329.4700 Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved. ADM823-ADM825 Preliminary Technical Data ADM823-ADM825--SPECIFICATIONS Table 2. VCC=4.75V to 5.5V for ADM82_L, VCC=4.5V to 5.5V for ADM82_M, VCC=3.15V to 3.6V for ADM82_T, VCC=3V to 3.6V for ADM82_S, VCC=2.7V to 3.6V for ADM82_R, VCC=2.38V to 2.75V for ADM82_Z, VCC=2.25V to 2.75V for ADM82_Y, TA=TMIN to TMAX, unless otherwise noted Parameter SUPPLY VCC Operating Voltage Range Min 1 1.2 Supply Current (SOT-23 only) Supply Current (SC70 only) RESET THRESHOLD VOLTAGE ADM82_L ADM82_M ADM82_T ADM82_S ADM82_R ADM82_Z (SC70 only) ADM82_Y (SC70 only) 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 RESET THRESHOLD TEMPERATURE COEFFICIENT RESET THRESHOLD HYSTERESIS RESET TIMEOUT PERIOD VCC TO RESET DELAY RESET Output Voltage Typ 140 Max Units 5.5 10 24 V V A 5 12 A 4.5 12 A 3 8 A 6 17 A 4 12 A 3 8 A 2 6 A 4.63 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 0.4 V V V V V V V V V V V V V V ppm/C mV mV ms s V 0.3 V 0.3 V 4.38 3.08 2.93 2.63 2.32 2.19 40 10 5 200 40 VCC-1.5 Rev.PrA | Page 2 of 7 280 V Test Conditions/Comments TA=0C to +70C TA=TMIN to TMAX WDI and MR unconnected ADM823L/M, ADM824L/M WDI and MR unconnected ADM823T/S/R/Z/Y, ADM824T/S/R/Z/Y MR unconnected ADM825L/M MR unconnected ADM825T/S/R/Z/Y WDI and MR unconnected ADM823L/M, ADM824L/M WDI and MR unconnected ADM823T/S/R/Z/Y, ADM824T/S/R/Z/Y MR unconnected ADM825L/M MR unconnected ADM825T/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=100mV VCC=VTH min, ISINK=3.2mA, ADM82_L/M VCC=VTH min, ISINK=1.2mA, ADM82_T/S/R/Z/Y TA=0C to +70C, VCC=1V, VCC falling, ISINK=50A VCC=VTH max, ISOURCE=120A, ADM82_L/M Preliminary Technical Data ADM823-ADM825 Parameter Min 0.8xVCC Typ RESET Output Short Circuit Current RESET Output Voltage Max Units V 800 A 400 A 0.4 V 0.3 V 0.8xVCC WATCHDOG INPUT (ADM823, ADM824) Watchdog Timeout Period WDI Pulse Width WDI Input Threshold VIL VIH WDI Input Current 1.12 50 1.6 2.40 0.3xVCC 0.7xVCC -20 120 -15 MANUAL RESET INPUT (ADM823, ADM825) MR Input Threshold 160 35 100 52 500 s ns VIL=0.4V, VIH=0.8xVCC, V V A A VWDI= VCC, time average VWDI=0, time average 0.3xVCC V V s ns 75 k ns 0.7xVCC 1 MR Input Pulse Width MR Glitch Rejection MR Pull-up Resistance MR to Reset Delay V Test Conditions/Comments VCC=VTH max, ISOURCE=30A, ADM82_T/S/R/Z/Y RESET=0V, VCC=5.5V, ADM82_L/M RESET=0V, VCC=5.5V, ADM82_T/S/R/Z/Y VCC=VTH max, ISINK=3.2mA, ADM824L/M, ADM825L/M VCC=VTH max, ISINK=1.2mA, ADM824T/S/R/Z/Y, ADM825T/S/R/Z/Y VCC>=1.8V, ISOURCE=150A ABSOLUTE MAXIMUM RATINGS Table 3. TA = 25C unless otherwise noted. Parameter VCC Output Current (RESET, RESET) Operating Temperature Range SC70 SOT-23 Storage Temperature Range JA Thermal Impedance SC70 SOT-23 Lead Temperature Soldering (10 sec) Vapour Phase (60 sec) Infrared (15 sec) Rating -0.3V to +6V 20mA -40C to +85C -40C to +125C -65C to +150C 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. 146C/W 270C/W 300C 215C 220C Rev.PrA | Page 3 of 7 ADM823-ADM825 Preliminary Technical Data PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS RESET 5 1 VCC RESET GND 2 GND TOP VIEW 3 VCC RESET 1 2 GND TOP VIEW 2 WDI RESET 3 VCC 4 MR TOP VIEW (Not to Scale) (Not to Scale) 4 5 ADM825 ADM824 (Not to Scale) MR 5 1 ADM823 4 WDI RESET 3 Table 4. Pin Functional Descriptions Pin No. 1 Name RESET 2 3 GND MR (ADM823) 4 RESET (ADM824/ADM825) WDI (ADM823/ADM824) 5 MR (ADM825) Description Push-Pull Active-Low Reset Output, which is 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. Features a 52k 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. VCC Power Supply Voltage being Monitored 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.PrA | Page 4 of 7 Preliminary Technical Data ADM823-ADM825 ORDERING GUIDE (ADM823, ADM824) Model ADM823LAKS-RL ADM823LAKS-R7 ADM823LART-RL ADM823LART-R7 ADM823MAKS-RL ADM823MAKS-R7 ADM823MART-RL ADM823MART-R7 ADM823TAKS-RL ADM823TAKS-R7 ADM823TART-RL ADM823TART-R7 ADM823SAKS-RL ADM823SAKS-R7 ADM823SART-RL ADM823SART-R7 ADM823RAKS-RL ADM823RAKS-R7 ADM823RART-RL ADM823RART-R7 ADM823ZAKS-RL ADM823ZAKS-R7 ADM823YAKS-RL ADM823YAKS-R7 ADM824LAKS-RL ADM824LAKS-R7 ADM824LART-RL ADM824LART-R7 ADM824MAKS-RL ADM824MAKS-R7 ADM824MART-RL ADM824MART-R7 ADM824TAKS-RL ADM824TAKS-R7 ADM824TART-RL ADM824TART-R7 ADM824SAKS-RL ADM824SAKS-R7 ADM824SART-RL ADM824SART-R7 ADM824RAKS-RL ADM824RAKS-R7 ADM824RART-RL ADM824RART-R7 ADM824ZAKS-RL ADM824ZAKS-R7 ADM824YAKS-RL ADM824YAKS-R7 Reset Threshold (V) 4.63 4.63 4.63 4.63 4.38 4.38 4.38 4.38 3.08 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 2.19 2.19 4.63 4.63 4.63 4.63 4.38 4.38 4.38 4.38 3.08 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 2.19 2.19 Temperature Range -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Rev. PrA | Page 5 of 7 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 10k 3k 10k 3k 10k 3k 10k 3k 10k 3k 10k 3k 10k 3k 10k 3k 10k 3k 10k 3k 10k 3k 10k 3k Package Type SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SC70-5 SC70-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SC70-5 SC70-5 Branding N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N07 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 N08 ADM823-ADM825 Preliminary Technical Data ORDERING GUIDE (ADM825) Model ADM825LAKS-RL ADM825LAKS-R7 ADM825LART-RL ADM825LART-R7 ADM825MAKS-RL ADM825MAKS-R7 ADM825MART-RL ADM825MART-R7 ADM825TAKS-RL ADM825TAKS-R7 ADM825TART-RL ADM825TART-R7 ADM825SAKS-RL ADM825SAKS-R7 ADM825SART-RL ADM825SART-R7 ADM825RAKS-RL ADM825RAKS-R7 ADM825RART-RL ADM825RART-R7 ADM825ZAKS-RL ADM825ZAKS-R7 ADM825YAKS-RL ADM825YAKS-R7 Reset Threshold (V) 4.63 4.63 4.63 4.63 4.38 4.38 4.38 4.38 3.08 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 2.19 2.19 Temperature Range -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +125C -40C to +125C -40C to +85C -40C to +85C -40C to +85C -40C to +85C Rev.PrA | Page 6 of 7 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 Package Type SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SOT-23-5 SOT-23-5 SC70-5 SC70-5 SC70-5 SC70-5 Branding N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 N09 Preliminary Technical Data ADM823-ADM825 OUTLINE DIMENSIONS 0.087 (2.20) 0.071 (1.80) 5 0.053 (1.35) 0.045 (1.15) 4 0.094 (2.40) 0.071 (1.80) 1 2 3 PIN 1 0.026 (0.65) BSC 0.051 (1.30) BSC 0.039 (1.00) 0.043 (1.10) 0.031 (0.80) 0.031 (0.80) 0.004 (0.10) 0.012 (0.30) 0.000 (0.00) 0.006 (0.15) SEATING PLANE 0.007 (0.18) 0.004 (0.10) 8o 0o 0.012 (0.30) 0.004 (0.10) Figure 1. 5-Lead Plastic Surface Mount Package [SC-70] (KS-5) Dimensions shown in millimeters 2.90 BSC 5 4 2.80 BSC 1.60 BSC 1 2 3 PIN 1 0.95 BSC 1.90 BSC 1.30 1.15 0.90 1.45 MAX 0.15 MAX 0.50 0.3 0.22 0.08 SEATING PLANE 10 5 0 COMPLIANT TO JEDEC STANDARDS MO-178AA Figure 1. 5-Lead Small Outline Transistor Package [SOT-23] (RT-5) Dimensions shown in millimeters (c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. Printed in the U.S.A. PR04534-0-2/04(PrA) Rev. PrA | Page 7 of 7 0.$ 0.45 0.3