ADM6824VART-RL7中文资料

Low Voltage Supervisory Circuits with

Watchdog & Manual Reset in 5-Lead SOT-23 Preliminary Technical Data ADM6821–ADM6825

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. Tel: https://www.sodocs.net/doc/247318736.html, Fax: 781.326.8703? 2004 Analog Devices, Inc. All rights reserved.

FEATURES

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 (3μA)

Guaranteed Reset Output valid to V CC=1V

Power Supply Glitch Immunity

Specified from -40°C to +125°C

5-Lead SOT-23 Package

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.

FUNCTIONAL BLOCK DIAGRAM

MR

RESET V

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 3μA, making them suitable for use in low power portable applications.

Table 1. Selection Table

ADM6821–ADM6825 Preliminary Technical Data

ADM6821–ADM6825—SPECIFICATIONS

Table 2. V CC=4. 5V to 5.5V for ADM682_L/M, V CC=2.7V to 3.6V for ADM682_T/S/R, V CC=2.1V to 2.75V for ADM682_Z/Y,

V CC=1.53V to 2.0V for ADM682_W/V, T A=-40°C to +125°C, unless otherwise noted.

Rev.PrA | Page 2 of 7

Preliminary Technical Data

ADM6821–ADM6825

Rev.PrA | Page 3 of 7

ABSOLUTE MAXIMUM RATINGS

Table 3. T A = 25°C unless otherwise noted.

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.

ADM6821–ADM6825

Preliminary Technical Data

Rev.PrA | Page 4 of 7

PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS

V CC

RESET GND

MR

WDI

V CC GND MR

WDI V CC RESET GND RESET

WDI V CC

RESET GND

RESET MR

Table 4. Pin Functional Descriptions

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.

Preliminary Technical Data

ADM6821–ADM6825

Rev. PrA | Page 5 of 7

ORDERING GUIDE

Model Reset Threshold (V) Temperature Range Quantity Package Type Branding ADM6821LART-RL 4.63 -40°C to +125°C 10k SOT-23-5 N0A ADM6821LART-RL7 4.63 -40°C to +125°C 3k SOT-23-5 N0A ADM6821MART-RL 4.38 -40°C to +125°C 10k SOT-23-5 N0A ADM6821MART-RL7 4.38 -40°C to +125°C 3k SOT-23-5 N0A ADM6821TART-RL 3.08 -40°C to +125°C 10k SOT-23-5 N0A ADM6821TART-RL7 3.08 -40°C to +125°C 3k SOT-23-5 N0A ADM6821SART-RL 2.93 -40°C to +125°C 10k SOT-23-5 N0A ADM6821SART-RL7 2.93 -40°C to +125°C 3k SOT-23-5 N0A ADM6821RART-RL 2.63 -40°C to +125°C 10k SOT-23-5 N0A ADM6821RART-RL7 2.63 -40°C to +125°C 3k SOT-23-5 N0A ADM6821ZART-RL 2.32 -40°C to +125°C 10k SOT-23-5 N0A ADM6821ZART-RL7 2.32 -40°C to +125°C 3k SOT-23-5 N0A ADM6821YART-R L 2.19 -40°C to +125°C 10k SOT-23-5 N0A ADM6821YART-R L 7 2.19 -40°C to +125°C 3k SOT-23-5 N0A ADM6821WART-RL 1.67 -40°C to +125°C 10k SOT-23-5 N0A ADM6821WART-RL7 1.67 -40°C to +125°C 3k SOT-23-5 N0A ADM6821VART-RL 1.58 -40°C to +125°C 10k SOT-23-5 N0A ADM6821VART-RL7 1.58 -40°C to +125°C 3k SOT-23-5 N0A ADM6822LART-RL 4.63 -40°C to +125°C 10k SOT-23-5 N0B ADM6822LART-RL7 4.63 -40°C to +125°C 3k SOT-23-5 N0B ADM6822MART-RL 4.38 -40°C to +125°C 10k SOT-23-5 N0B ADM6822MART-RL7 4.38 -40°C to +125°C 3k SOT-23-5 N0B ADM6822TART-RL 3.08 -40°C to +125°C 10k SOT-23-5 N0B ADM6822TART-RL7 3.08 -40°C to +125°C 3k SOT-23-5 N0B ADM6822SART-RL 2.93 -40°C to +125°C 10k SOT-23-5 N0B ADM6822SART-RL7 2.93 -40°C to +125°C 3k SOT-23-5 N0B ADM6822RART-RL 2.63 -40°C to +125°C 10k SOT-23-5 N0B ADM6822RART-RL7 2.63 -40°C to +125°C 3k SOT-23-5 N0B ADM6822ZART-RL 2.32 -40°C to +125°C 10k SOT-23-5 N0B ADM6822ZART-RL7 2.32 -40°C to +125°C 3k SOT-23-5 N0B ADM6822YART-RL 2.19 -40°C to +125°C 10k SOT-23-5 N0B ADM6822YART-RL7 2.19 -40°C to +125°C 3k SOT-23-5 N0B ADM6822WART-RL 1.67 -40°C to +125°C 10k SOT-23-5 N0B ADM6822WART-RL7 1.67 -40°C to +125°C 3k SOT-23-5 N0B ADM6822VART-RL 1.58 -40°C to +125°C 10k SOT-23-5 N0B ADM6822VART-RL7 1.58 -40°C to +125°C 3k SOT-23-5 N0B ADM6823LART-RL 4.63 -40°C to +125°C 10k SOT-23-5 N0C ADM6823LART-RL7 4.63 -40°C to +125°C 3k SOT-23-5 N0C ADM6823MART-RL 4.38 -40°C to +125°C 10k SOT-23-5 N0C ADM6823MART-RL7 4.38 -40°C to +125°C 3k SOT-23-5 N0C ADM6823TART-RL 3.08 -40°C to +125°C 10k SOT-23-5 N0C ADM6823TART-RL7 3.08 -40°C to +125°C 3k SOT-23-5 N0C ADM6823SART-RL 2.93 -40°C to +125°C 10k SOT-23-5 N0C ADM6823SART-RL7 2.93 -40°C to +125°C 3k SOT-23-5 N0C ADM6823RART-RL 2.63 -40°C to +125°C 10k SOT-23-5 N0C ADM6823RART-RL7 2.63 -40°C to +125°C 3k SOT-23-5 N0C ADM6823ZART-RL 2.32 -40°C to +125°C 10k SOT-23-5 N0C ADM6823ZART-RL7 2.32 -40°C to +125°C 3k SOT-23-5 N0C ADM6823YART-R L

2.19 -40°C to +125°C 10k SOT-23-5 N0C ADM6823YART-R L 7 2.19 -40°C to +125°C 3k

SOT-23-5

N0C

ADM6821–ADM6825

Preliminary Technical Data

Rev.PrA | Page 6 of 7

ORDERING GUIDE (CONTD.)

Model Reset Threshold (V) Temperature Range Quantity Package Type Branding ADM6823WART-RL 1.67 -40°C to +125°C 10k SOT-23-5 N0C ADM6823WART-RL7 1.67 -40°C to +125°C 3k SOT-23-5 N0C ADM6823VART-RL 1.58 -40°C to +125°C 10k SOT-23-5 N0C ADM6823VART-RL7 1.58 -40°C to +125°C 3k SOT-23-5 N0C ADM6824LART-RL 4.63 -40°C to +125°C 10k SOT-23-5 N0D ADM6824LART-RL7 4.63 -40°C to +125°C 3k SOT-23-5 N0D ADM6824MART-RL 4.38 -40°C to +125°C 10k SOT-23-5 N0D ADM6824MART-RL7 4.38 -40°C to +125°C 3k SOT-23-5 N0D ADM6824TART-RL 3.08 -40°C to +125°C 10k SOT-23-5 N0D ADM6824TART-RL7 3.08 -40°C to +125°C 3k SOT-23-5 N0D ADM6824SART-RL 2.93 -40°C to +125°C 10k SOT-23-5 N0D ADM6824SART-RL7 2.93 -40°C to +125°C 3k SOT-23-5 N0D ADM6824RART-RL 2.63 -40°C to +125°C 10k SOT-23-5 N0D ADM6824RART-RL7 2.63 -40°C to +125°C 3k SOT-23-5 N0D ADM6824ZART-RL 2.32 -40°C to +125°C 10k SOT-23-5 N0D ADM6824ZART-RL7 2.32 -40°C to +125°C 3k SOT-23-5 N0D ADM6824YART-R L 2.19 -40°C to +125°C 10k SOT-23-5 N0D ADM6824YART-R L 7 2.19 -40°C to +125°C 3k SOT-23-5 N0D ADM6824WART-RL 1.67 -40°C to +125°C 10k SOT-23-5 N0D ADM6824WART-RL7 1.67 -40°C to +125°C 3k SOT-23-5 N0D ADM6824VART-RL 1.58 -40°C to +125°C 10k SOT-23-5 N0D ADM6824VART-RL7 1.58 -40°C to +125°C 3k SOT-23-5 N0D ADM6825LART-RL 4.63 -40°C to +125°C 10k SOT-23-5 N0E ADM6825LART-RL7 4.63 -40°C to +125°C 3k SOT-23-5 N0E ADM6825MART-RL 4.38 -40°C to +125°C 10k SOT-23-5 N0E ADM6825MART-RL7 4.38 -40°C to +125°C 3k SOT-23-5 N0E ADM6825TART-RL 3.08 -40°C to +125°C 10k SOT-23-5 N0E ADM6825TART-RL7 3.08 -40°C to +125°C 3k SOT-23-5 N0E ADM6825SART-RL 2.93 -40°C to +125°C 10k SOT-23-5 N0E ADM6825SART-RL7 2.93 -40°C to +125°C 3k SOT-23-5 N0E ADM6825RART-RL 2.63 -40°C to +125°C 10k SOT-23-5 N0E ADM6825RART-RL7 2.63 -40°C to +125°C 3k SOT-23-5 N0E ADM6825ZART-RL 2.32 -40°C to +125°C 10k SOT-23-5 N0E ADM6825ZART-RL7 2.32 -40°C to +125°C 3k SOT-23-5 N0E ADM6825YART-R L 2.19 -40°C to +125°C 10k SOT-23-5 N0E ADM6825YART-R L 7 2.19 -40°C to +125°C 3k SOT-23-5 N0E ADM6825WART-RL 1.67 -40°C to +125°C 10k SOT-23-5 N0E ADM6825WART-RL7 1.67 -40°C to +125°C 3k SOT-23-5 N0E ADM6825VART-RL 1.58 -40°C to +125°C 10k SOT-23-5 N0E ADM6825VART-RL7 1.58 -40°C to +125°C 3k

SOT-23-5

N0E

Preliminary Technical Data

ADM6821–ADM6825

Rev. PrA | Page 7 of 7

OUTLINE DIMENSIONS

0.3

PLANE

COMPLIANT TO JEDEC STANDARDS MO-178AA

Figure 1. 5-Lead Small Outline Transistor Package [SOT-23]

(RT-5)

Dimensions shown in millimeters

? 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective companies. Printed in the U.S.A.