ADM6821LART-RL AD [Analog Devices], ADM6821LART-RL Datasheet

ADM6821LART-RL

Manufacturer Part Number

ADM6821LART-RL

Description

Low Voltage Supervisory Circuits with Watchdog & Manual Reset in 5-Lead SOT-23

Manufacturer

AD [Analog Devices]

Datasheet

1.ADM6821LART-RL.pdf (7 pages)

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Preliminary Technical Data

FEATURES

APPLICATIONS

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.

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.

Precision Low Voltage Monitoring down to 1.8V

9 Reset Threshold Options:

140ms (Min) Reset Timeout

Watchdog Timer with 1.6s Timeout

Manual Reset Input

Reset Output Stages

Low Power Consumption (3µA)

Guaranteed Reset Output valid to V

Power Supply Glitch Immunity

Specified from -40°C to +125°C

5-Lead SOT-23 Package

Microprocessor Systems

Computers

Controllers

Intelligent Instruments

Portable Equipment

1.58V to 4.63V

Push-Pull Active-Low

Open-Drain Active-Low

Push-Pull Active-High

Part No.

ADM6821

ADM6822

ADM6823

ADM6824

ADM6825

Watchdog Timer

=1V

Yes

Watchdog & Manual Reset in 5-Lead SOT-23

Table 1. Selection Table

Low Voltage Supervisory Circuits with

Manual Reset

Yes

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.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.326.8703

Open-Drain

Push-Pull

RESET

FUNCTIONAL BLOCK DIAGRAM

Output Stage

ADM6821–ADM6825

Push-Pull

RESET

www.analog.com

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ADM6821LART-RL Summary of contents

Page 1

Preliminary Technical Data 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 ...

Page 2

ADM6821–ADM6825 ADM6821–ADM6825—SPECIFICATIONS Table 5.5V for ADM682_L/ =1.53V to 2.0V for ADM682_W/ Parameter SUPPLY V Operating Voltage Range CC Supply Current (WDI and MR unconnected) RESET THRESHOLD VOLTAGE ADM682_L ADM682_M ADM682_T ...

Page 3

Preliminary Technical Data Parameter RESET Output Voltage High RESET Output Voltage Low WATCHDOG INPUT (ADM6821-ADM6824) Watchdog Timeout Period WDI Pulse Width WDI Input Threshold WDI Input Current MANUAL RESET INPUT (ADM6821-ADM6823/ADM6825) MR Input Threshold MR Input ...

Page 4

ADM6821–ADM6825 PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS RESET Pin No. Name 1 RESET (ADM6822/23/24/25) RESET (ADM6821) 2 GND 3 MR (ADM6821/22/23) RESET (ADM6824/ADM6825) 4 WDI (ADM6821/22/23/24) MR (ADM6825 ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as ...

Page 5

... Preliminary Technical Data ORDERING GUIDE Model Reset Threshold (V) ADM6821LART-RL 4.63 ADM6821LART-RL7 4.63 ADM6821MART-RL 4.38 ADM6821MART-RL7 4.38 ADM6821TART-RL 3.08 ADM6821TART-RL7 3.08 ADM6821SART-RL 2.93 ADM6821SART-RL7 2.93 ADM6821RART-RL 2.63 ADM6821RART-RL7 2.63 ADM6821ZART-RL 2.32 ADM6821ZART-RL7 2.32 ADM6821YART-RL 2.19 ADM6821YART-RL7 2.19 ADM6821WART-RL 1.67 ADM6821WART-RL7 1.67 ADM6821VART-RL 1.58 ADM6821VART-RL7 1.58 ADM6822LART-RL 4.63 ADM6822LART-RL7 4.63 ADM6822MART-RL 4.38 ADM6822MART-RL7 4.38 ADM6822TART-RL 3.08 ADM6822TART-RL7 3.08 ADM6822SART-RL 2.93 ADM6822SART-RL7 2.93 ADM6822RART-RL 2.63 ADM6822RART-RL7 2.63 ADM6822ZART-RL 2.32 ADM6822ZART-RL7 2.32 ADM6822YART-RL 2.19 ADM6822YART-RL7 2.19 ADM6822WART-RL 1 ...

Page 6

ADM6821–ADM6825 ORDERING GUIDE (CONTD.) Model Reset Threshold (V) ADM6823WART-RL 1.67 ADM6823WART-RL7 1.67 ADM6823VART-RL 1.58 ADM6823VART-RL7 1.58 ADM6824LART-RL 4.63 ADM6824LART-RL7 4.63 ADM6824MART-RL 4.38 ADM6824MART-RL7 4.38 ADM6824TART-RL 3.08 ADM6824TART-RL7 3.08 ADM6824SART-RL 2.93 ADM6824SART-RL7 2.93 ADM6824RART-RL 2.63 ADM6824RART-RL7 2.63 ADM6824ZART-RL 2.32 ADM6824ZART-RL7 2.32 ...

Page 7

Preliminary Technical Data OUTLINE DIMENSIONS 1.30 1.15 0.90 0.15 MAX © 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) 2.90 BSC 5 4 2.80 BSC ...

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