19-1676; Rev 4; 6/10
Pin-Selectable Watchdog Timers
9–MAX6374
General Description
Features
♦ Precision Watchdog Timer for Critical
The MAX6369–MAX6374 are pin-selectable watchdog
timers that supervise microprocessor (µP) activity and
signal when a system is operating improperly. During
normal operation, the microprocessor should repeated-
ly toggle the watchdog input (WDI) before the selected
watchdog timeout period elapses to demonstrate that
the system is processing code properly. If the µP does
not provide a valid watchdog input transition before the
timeout period expires, the supervisor asserts a watch-
dog (WDO) output to signal that the system is not exe-
cuting the desired instructions within the expected time
frame. The watchdog output pulse can be used to reset
the µP or interrupt the system to warn of processing
errors.
µP Applications
♦ Pin-Selectable Watchdog Timeout Periods
♦ Pin-Selectable Watchdog Startup Delay Periods
♦ Ability to Change Watchdog Timing Characteristics
Without Power Cycling
♦ Open-Drain or Push-Pull Pulsed Active-Low
Watchdog Output
♦ Watchdog Timer Disable Feature
♦ +2.5V to +5.5V Operating Voltage
♦ 8µA Low Supply Current
The MAX6369–MAX6374 are flexible watchdog timer
supervisors that can increase system reliability through
notification of code execution errors. The family offers
several pin-selectable watchdog timing options to
match a wide range of system timing applications:
♦ No External Components Required
♦ Miniature 8-Pin SOT23 Package
Ordering Information
• Watchdog startup delay: provides an initial delay
before the watchdog timer is started.
TEMP
PIN-
TOP
PART
RANGE
PACKAGE MARK
• Watchdog timeout period: normal operating watch-
dog timeout period after the initial startup delay.
MAX6369KA-T
MAX6369KA/V-T
MAX6369KA/V+T
MAX6370KA-T
MAX6371KA-T
MAX6372KA-T
MAX6373KA-T
MAX6374KA-T
-40°C to +125°C 8 SOT23
-40°C to +125°C 8 SOT23
-40°C to +125°C 8 SOT23
-40°C to +125°C 8 SOT23
-40°C to +125°C 8 SOT23
-40°C to +125°C 8 SOT23
-40°C to +125°C 8 SOT23
-40°C to +125°C 8 SOT23
AADC
AADC
AADC
AADD
AADE
AADF
AADG
AADH
• Watchdog output/timing options: open drain (100ms)
or push-pull (1ms).
The MAX6369–MAX6374 operate over a +2.5V to +5.5V
supply range and are available in miniature 8-pin
SOT23 packages.
________________________Applications
Embedded Control Systems
Note: All devices are available in tape-and-reel only. Required
order increment is 2,500 pieces.
Industrial Controllers
Critical µP and Microcontroller (µC) Monitoring
Automotive
/V denotes an automotive qualified part.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Telecommunications
Pin Configuration appears at end of data sheet.
Networking
Selector Guide
WDO PULSE
WIDTH (ms)
PART
OUTPUT
MINIMUM STARTUP DELAY
MINIMUM WATCHDOG TIMEOUT
MAX6369
MAX6370
MAX6371
MAX6372
MAX6373
MAX6374
Open Drain
Push-Pull
100
1
Selectable: 1ms to 60s
Selectable: 1ms to 60s
60s
Selectable: 1ms to 60s
Selectable: 1ms to 60s
Selectable: 1ms to 60s
Selectable: 1ms to 60s
Selectable: 30µs to 10s
Selectable: 30µs to 10s
Open Drain
Push-Pull
100
1
60s
Open Drain
Push-Pull
100
1
Selectable: 200µs to 60s or first edge
Selectable: 200µs to 60s or first edge
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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