adm8698arwz Analog Devices, Inc., adm8698arwz Datasheet
adm8698arwz
Manufacturer Part Number
adm8698arwz
Description
?p Supervisory Circuit With 4.65v Threshold Voltage, Low Supply Current And Active Low Reset Output. Upgrade For Adm698
Manufacturer
Analog Devices, Inc.
Datasheet
1.ADM8698ARWZ.pdf
(4 pages)
a
GENERAL DESCRIPTION
The ADM8698/ADM8699 supervisory circuits provide power
supply monitoring and watchdog timing for microprocessor
systems.
The ADM8698 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 ADM8699 features an identical monitoring circuit as in the
ADM8698, 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/SOIC and 16-lead
SOIC packages. The 16-lead SOIC contains additional out-
puts RESET (without inversion) and Watchdog Output WDO
(ADM8699 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 ADM698/ADM699, MAX698/MAX699
Guaranteed RESET Assertion with V
Low 70 A 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
Fax: 617/326-8703
WATCHDOG
+5V
INPUT
WDI
V
CC
*
*
TYPICAL APPLICATION CIRCUIT
WDI (ADM8699 ONLY)
RESET (SOIC ONLY)
WDO (ADM8699 SOIC ONLY)
FUNCTIONAL BLOCK DIAGRAM
4.65V
TRANSITION DETECTOR
ADM8698/
ADM8699
V
GND
CC
ADM8698/ADM8699
World Wide Web Site: http://www.analog.com
WATCHDOG
Supervisory Circuits
(1 sec)
RESET
WDI
*
*
ADM8699 ONLY
GENERATOR
ADM8698/
ADM8699
Microprocessor
RESET
© Analog Devices, Inc., 1997
I/O LINE
P RESET
P SYSTEM
P POWER
RESET
RESET
WATCHDOG
OUTPUT WDO
*
*
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adm8698arwz Summary of contents
Page 1
... WDI (ADM8699 ONLY) RESET (SOIC ONLY) WDO (ADM8699 SOIC ONLY) TYPICAL APPLICATION CIRCUIT V CC RESET ADM8698/ ADM8699 * WDI I/O LINE GND * ADM8699 ONLY World Wide Web Site: http://www.analog.com © Analog Devices, Inc., 1997 * RESET RESET WATCHDOG OUTPUT WDO * P POWER P RESET P SYSTEM ...
Page 2
ADM8698/ADM8699–SPECIFICATIONS Parameter V Operating Voltage Range CC Supply Current Power-Down Reset Assertion Power-Up Reset Deassertion Reset Threshold Hysteresis Reset Active Time Watchdog Timeout Period (ADM8699) Minimum WDI Input Pulse Width RESET Output Voltage RESET Output Voltage ( ...
Page 3
PIN FUNCTION DESCRIPTIONS Mnemonic Function Power Supply Input. CC GND 0 V. Ground reference for all signals. RESET Logic Output. RESET goes low whenever V falls below the reset voltage threshold (4.65 V typ). RESET remains low ...
Page 4
ADM8698/ADM8699 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 ...