19-2804; Rev 1; 3/04
5-Pin Watchdog Timer Circuit
________________General Description
The MAX6814 is a low-power watchdog circuit in a tiny 5-
pin SC70 package. This device improves system reliability
by monitoring the system for software code execution
errors. When the watchdog input detects a transitional
edge, the internal watchdog timer clears and restarts,
then begins counting again. If the watchdog timer
exceeds the watchdog timeout period (1.6s typ), the
active-low, push-pull watchdog output asserts for the
watchdog pulse period (140ms min) to alert the system of
the fault.
The MAX6814 consumes only 4碌A of supply current and
is fully specified over the extended temperature range.
鈾?/div>
4碌A Operating Current
鈾?/div>
Watchdog Timer with 1.6s Timeout
鈾?/div>
140ms (min)
WDO
Pulse Period
鈾?/div>
Push-Pull Active-Low
WDO
鈾?/div>
Fully Specified Over Extended Temperature
Range
鈾?/div>
No External Components
Features
MAX6814
________________________Applications
Computers and Controllers
Embedded Controllers
Intelligent Instruments
Automotive Systems
Critical 碌P Monitoring
MAX6814XK-T
PART
Ordering Information
TEMP
RANGE
-40掳C to +85掳C
PIN-
PACKAGE
5 SC70-5
TOP
MARK
AEK
Typical Operating Circuit
V
CC
Pin Configuration
TOP VIEW
V
CC
WDO
NMI
V
CC
WDO
1
5
V
CC
MAX6814
WDI
GND
I/O
GND
2
MAX6814
碌P
N.C.
3
GND
4
WDI
SC70-5
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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