 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| Preliminary Technical Data FEATURES Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23 ADM6821-ADM6825 FUNCTIONAL BLOCK DIAGRAM VCC Precision Low Voltage Monitoring down to 1.8V 9 Reset Threshold Options: 1.58V to 4.63V 140ms (Min) Reset Timeout Watchdog Timer with 1.6s Timeout Manual Reset Input Reset Output Stages Push-Pull Active-Low Open-Drain Active-Low Push-Pull Active-High Low Power Consumption (3A) Guaranteed Reset Output valid to VCC=1V Power Supply Glitch Immunity Specified from -40C to +125C 5-Lead SOT-23 Package ADM6821 VCC VREF RESET GENERATOR RESET MR DEBOUNCE WATCHDOG DETECTOR GND WDI APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments Portable Equipment GENERAL DESCRIPTION The ADM6821-ADM6825 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 9 reset threshold options ranging from 1.58V to 4.63V. The reset and watchdog timeout periods are fixed at 140ms (min) and 1.6s (typ), respectively. The ADM6821-ADM6825 are available in 5-lead SOT-23 packages and typically consume only 3A, making them suitable for use in low power portable applications. Table 1. Selection Table Part No. ADM6821 ADM6822 ADM6823 ADM6824 ADM6825 Watchdog Timer Yes Yes Yes Yes Manual Reset Yes Yes Yes Yes Output Stage RESET Open-Drain Push-Pull Push-Pull Push-Pull RESET 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. ADM6821-ADM6825 ADM6821-ADM6825--SPECIFICATIONS Preliminary Technical Data Table 2. VCC=4. 5V to 5.5V for ADM682_L/M, VCC=2.7V to 3.6V for ADM682_T/S/R, VCC=2.1V to 2.75V for ADM682_Z/Y, VCC=1.53V to 2.0V for ADM682_W/V, TA=-40C to +125C, unless otherwise noted. Parameter SUPPLY VCC Operating Voltage Range Supply Current (WDI and MR unconnected) Min 1 1.2 10 Typ Max 5.5 5.5 24 30 7 16 25 5 12 Units V V A A A A A Test Conditions/Comments TA=0C to +70C TA=--40C to +125C VCC=5.5V, no load, TA=--40C to +85C VCC=5.5V, no load, TA=--40C to +125C VCC=3.6V, no load, TA=--40C to +85C VCC=3.6V, no load, TA=--40C to +125C VCC=3.6V, no load, TA=--40C to +85C (ADM6825 only) VCC=3.6V, no load, TA=--40C to +125C (ADM6825 only) TA=-40C to +85C TA=-40C to +125C TA=-40C to +85C TA=-40C to +125C TA=-40C to +85C TA=-40C to +125C TA=-40C to +85C TA=-40C to +125C TA=-40C to +85C TA=-40C to +125C TA=-40C to +85C TA=-40C to +125C TA=-40C to +85C TA=-40C to +125C TA=-40C to +85C TA=-40C to +125C TA=-40C to +85C 20 A RESET THRESHOLD VOLTAGE ADM682_L ADM682_M ADM682_T ADM682_S ADM682_R ADM682_Z ADM682_Y ADM682_W ADM682_V RESET THRESHOLD TEMPERATURE COEFFICIENT RESET THRESHOLD HYSTERESIS RESET TIMEOUT PERIOD VCC TO RESET DELAY RESET Output Voltage Low 4.50 4.47 4.25 4.22 3.00 2.97 2.85 2.83 2.55 2.53 2.25 2.24 2.12 2.11 1.62 1.61 1.52 4.63 4.38 3.08 2.93 2.63 2.32 2.19 1.67 1.58 60 2x VTH 200 20 4.75 4.78 4.50 4.53 3.15 3.17 3.00 3.02 2.70 2.72 2.38 2.40 2.25 2.27 1.71 1.72 1.62 140 100 280 320 0.4 0.3 0.3 0.3 V V V V V V V V V V V V V V V V V ppm/C mV ms ms s V V V V V RESET Output Voltage High 0.8xVCC VCC = VTH to (VTH - 100mV) VCC>=4.25V, ISINK=3.2mA, reset asserted VCC>=2.55V, ISINK=1.2mA, reset asserted VCC>=1.25V, ISINK=100uA, reset asserted VCC>=1.0V, ISINK=50uA, reset asserted, TA=-40C to +85C VCC>=4.75V, ISOURCE=800uA, reset not asserted Rev.PrA | Page 2 of 7 Preliminary Technical Data Parameter Min 0.8xVCC 0.8xVCC RESET Output Voltage High 0.8xVCC 0.8xVCC 0.8xVCC 0.8xVCC RESET Output Voltage Low 0.4 0.3 0.3 WATCHDOG INPUT (ADM6821-ADM6824) Watchdog Timeout Period WDI Pulse Width WDI Input Threshold VIL VIH WDI Input Current MANUAL RESET INPUT (ADM6821-ADM6823/ADM6825) MR Input Threshold MR Input Pulse Width MR Glitch Rejection MR Pull-up Resistance MR to Reset Delay 0.7xVCC 1 25 100 50 200 75 V V V Typ Max Units V V ADM6821-ADM6825 Test Conditions/Comments VCC>=3.15V, ISOURCE=500uA, reset not asserted VCC>=1.8V, ISOURCE=200uA, reset not asserted VCC>=4.25V, ISOURCE=800uA, reset asserted VCC>=2.55V, ISOURCE=500uA, reset asserted VCC>=1.50V, ISOURCE=100uA, reset asserted VCC>=1.0V, ISOURCE=1uA, reset asserted, TA=-40C to +85C VCC>=4.75V, ISINK=3.2mA, reset not asserted VCC>=3.15V, ISINK=1.2mA, reset not asserted VCC>=1.8V, ISINK=500uA, reset not asserted 1.12 50 1.6 2.40 s ns V V A A V V s ns k ns VIL=0.4V, VIH=0.8xVCC, 0.3xVCC 0.7xVCC -20 120 -15 160 VWDI= VCC, time average VWDI=0, time average 0.3xVCC ABSOLUTE MAXIMUM RATINGS Table 3. TA = 25C unless otherwise noted. Parameter VCC Output Current (RESET, RESET) Operating Temperature Range Storage Temperature Range JA Thermal Impedance Lead Temperature Soldering (10 sec) Vapour Phase (60 sec) Infrared (15 sec) Rating -0.3V to +6V 20mA -40C to +125C -65C to +150C 270C/W 300C 215C 220C 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. Rev.PrA | Page 3 of 7 ADM6821-ADM6825 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS RESET 1 GND MR 2 3 ADM6821 (Not to Scale) Preliminary Technical Data 5 VCC RESET GND 1 2 3 ADM6822/ ADM6823 (Not to Scale) 5 VCC TOP VIEW TOP VIEW 4 WDI MR 4 WDI RESET GND RESET 1 ADM6824 5 TOP VIEW VCC RESET GND 1 ADM6825 5 TOP VIEW VCC 2 3 2 3 (Not to Scale) (Not to Scale) 4 WDI RESET 4 MR Table 4. Pin Functional Descriptions Pin No. 1 Name RESET (ADM6822/23/24/25) 2 3 RESET (ADM6821) GND MR (ADM6821/22/23) 4 RESET (ADM6824/ADM6825) WDI (ADM6821/22/23/24) MR (ADM6825) 5 VCC Description Active-Low Reset Output, which is asserted whenever VCC is below the reset.threshold, VTH. Open-Drain Output Stage for ADM6822. Push-Pull Output Stage for ADM6823/24/25. Active-High Reset Output 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. 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 ORDERING GUIDE Model ADM6821LART-RL ADM6821LART-RL7 ADM6821MART-RL ADM6821MART-RL7 ADM6821TART-RL ADM6821TART-RL7 ADM6821SART-RL ADM6821SART-RL7 ADM6821RART-RL ADM6821RART-RL7 ADM6821ZART-RL ADM6821ZART-RL7 ADM6821YART-RL ADM6821YART-RL7 ADM6821WART-RL ADM6821WART-RL7 ADM6821VART-RL ADM6821VART-RL7 ADM6822LART-RL ADM6822LART-RL7 ADM6822MART-RL ADM6822MART-RL7 ADM6822TART-RL ADM6822TART-RL7 ADM6822SART-RL ADM6822SART-RL7 ADM6822RART-RL ADM6822RART-RL7 ADM6822ZART-RL ADM6822ZART-RL7 ADM6822YART-RL ADM6822YART-RL7 ADM6822WART-RL ADM6822WART-RL7 ADM6822VART-RL ADM6822VART-RL7 ADM6823LART-RL ADM6823LART-RL7 ADM6823MART-RL ADM6823MART-RL7 ADM6823TART-RL ADM6823TART-RL7 ADM6823SART-RL ADM6823SART-RL7 ADM6823RART-RL ADM6823RART-RL7 ADM6823ZART-RL ADM6823ZART-RL7 ADM6823YART-RL ADM6823YART-RL7 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 2.32 2.19 2.19 1.67 1.67 1.58 1.58 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.32 2.19 2.19 1.67 1.67 1.58 1.58 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.32 2.19 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 -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 -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 -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 -40C to +125C -40C to +125C 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 10k 3k ADM6821-ADM6825 Package Type SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 Branding N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0A N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0B N0C N0C N0C N0C N0C N0C N0C N0C N0C N0C N0C N0C N0C N0C Rev. PrA | Page 5 of 7 ADM6821-ADM6825 ORDERING GUIDE (CONTD.) Model ADM6823WART-RL ADM6823WART-RL7 ADM6823VART-RL ADM6823VART-RL7 ADM6824LART-RL ADM6824LART-RL7 ADM6824MART-RL ADM6824MART-RL7 ADM6824TART-RL ADM6824TART-RL7 ADM6824SART-RL ADM6824SART-RL7 ADM6824RART-RL ADM6824RART-RL7 ADM6824ZART-RL ADM6824ZART-RL7 ADM6824YART-RL ADM6824YART-RL7 ADM6824WART-RL ADM6824WART-RL7 ADM6824VART-RL ADM6824VART-RL7 ADM6825LART-RL ADM6825LART-RL7 ADM6825MART-RL ADM6825MART-RL7 ADM6825TART-RL ADM6825TART-RL7 ADM6825SART-RL ADM6825SART-RL7 ADM6825RART-RL ADM6825RART-RL7 ADM6825ZART-RL ADM6825ZART-RL7 ADM6825YART-RL ADM6825YART-RL7 ADM6825WART-RL ADM6825WART-RL7 ADM6825VART-RL ADM6825VART-RL7 Reset Threshold (V) 1.67 1.67 1.58 1.58 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.32 2.19 2.19 1.67 1.67 1.58 1.58 4.63 4.63 4.38 4.38 3.08 3.08 2.93 2.93 2.63 2.63 2.32 2.32 2.19 2.19 1.67 1.67 1.58 1.58 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 -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 -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 -40C to +125C -40C to +125C -40C to +125C -40C to +125C 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 Preliminary Technical Data Package Type SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 Branding N0C N0C N0C N0C N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0D N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E N0E Rev.PrA | Page 6 of 7 Preliminary Technical Data OUTLINE DIMENSIONS 2.90 BSC ADM6821-ADM6825 5 4 1.60 BSC 1 2 3 2.80 BSC 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.$ 0.45 0.3 0.15 MAX 0.50 0.3 SEATING PLANE 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. PR04535-0-2/04(PrA) Rev. PrA | Page 7 of 7 |
Price & Availability of ADM6821
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |