ADM698 Analog Devices, ADM698 Datasheet

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ADM698

Manufacturer Part Number
ADM698
Description
Microprocessor Supervisory Circuit
Manufacturer
Analog Devices
Datasheet

Specifications of ADM698

# Of Monitored Voltages
1
Backup-battery Switch
No
Manual Reset Capability
No
Package
DIP,SOIC
Reset Threshold Summary
4.65V
Reset Output-stage
Active-High/Push-Pull,Active-Low/Push-Pull
Min Reset Timeout (ms)
140
Watchdog Timer
No

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a
GENERAL DESCRIPTION
The ADM698/ADM699 supervisory circuits provide power
supply monitoring and watchdog timing for microprocessor
systems.
The ADM698 monitors the 5 V V
ates a RESET pulse during power up, power down and during
low voltage “Brown Out” conditions. The RESET output is
guaranteed to be functional (logic low) with V
The ADM699 features an identical monitoring circuit as in the
ADM698 plus an additional watchdog timer input to monitor
microprocessor activity. The RESET output is forced low if the
watchdog input is not toggled within the 1 second watchdog
timeout period.
Both parts are available in 8-pin plastic DIP and 16-lead SOIC
packages. The 16-lead SOIC contains additional outputs
RESET (without inversion) and Watchdog Output WDO
(ADM699 only).
REV. 0
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Superior Upgrade for MAX698/MAX699
Guaranteed RESET Assertion with V
Low 0.6 mA Supply Current
Precision 4.65 V Voltage Monitor
Power OK/Reset Time Delay
Watchdog Timer
Minimum Component Count
Performance Specified over Temperature
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical P Power Monitoring
CC
power supply and gener-
CC
= 1 V
CC
as low as 1 V.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
WATCHDOG
+5V
INPUT
WDI
V
CC
*
TYPICAL APPLICATION CIRCUIT
FUNCTIONAL BLOCK DIAGRAM
*
WDI (ADM699 ONLY)
RESET (SOIC ONLY)
WDO (ADM699 SOIC ONLY)
ADM698/
ADM699
4.65V
TRANSITION DETECTOR
GND
V
CC
WATCHDOG
Supervisory Circuits
RESET
(1 sec)
WDI
ADM698/ADM699
*
*
ADM699 ONLY
GENERATOR
ADM698/
ADM699
Microprocessor
RESET
µP RESET
I/O LINE
µP SYSTEM
µP POWER
Fax: 617/326-8703
WATCHDOG
OUTPUT WDO
RESET
RESET
*
*

Related parts for ADM698

ADM698 Summary of contents

Page 1

... Out” conditions. The RESET output is guaranteed to be functional (logic low) with V The ADM699 features an identical monitoring circuit as in the ADM698 plus an additional watchdog timer input to monitor microprocessor activity. The RESET output is forced low if the watchdog input is not toggled within the 1 second watchdog timeout period ...

Page 2

... 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 the ADM698/ADM699 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 ...

Page 3

... TOP VIEW GND (WDI) (Not to Scale) (Not to Scale) GND ADM699 ONLY PIN CONFIGURATION (SOIC) GND RESET RESET ADM698/ TOP VIEW (WDO ADM699 (Not to Scale) NC GND 4 13 TOP VIEW NC 5 (Not to Scale (WDI ...

Page 4

... ADM698/ADM699 CIRCUIT INFORMATION Power Fail RESET A precision voltage detector monitors V RESET output to hold the microprocessor’s Reset line low when V falls below the reset threshold (4.65 V) (see Figure 4). The CC reset voltage threshold is set to accommodate a 5% variation The voltage detector has 40 mV hysteresis to ensure that ...

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