MAX6369_11 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Pin-Selectable Watchdog Timers

19-1676; Rev 5; 1/11
Pin-Selectable Watchdog Timers
General Description
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.
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:
• Watchdog startup delay: provides an initial delay
before the watchdog timer is started.
• Watchdog timeout period: normal operating watch-
dog timeout period after the initial startup delay.
• 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
Industrial Controllers
Critical µP and Microcontroller (µC) Monitoring
Automotive
Telecommunications
Networking
Features
o Precision Watchdog Timer for Critical
µP Applications
o Pin-Selectable Watchdog Timeout Periods
o Pin-Selectable Watchdog Startup Delay Periods
o Ability to Change Watchdog Timing Characteristics
Without Power Cycling
o Open-Drain or Push-Pull Pulsed Active-Low
Watchdog Output
o Watchdog Timer Disable Feature
o +2.5V to +5.5V Operating Voltage
o 8µA Low Supply Current
o No External Components Required
o Miniature 8-Pin SOT23 Package
Ordering Information
PART
TEMP
RANGE
PIN-
TOP
PACKAGE MARK
MAX6369KA-T
-40°C to +125°C 8 SOT23 AADC
MAX6369KA/V-T -40°C to +125°C 8 SOT23 AEQV
MAX6369KA/V+T -40°C to +125°C 8 SOT23 AEQV
MAX6370KA-T
-40°C to +125°C 8 SOT23 AADD
MAX6371KA-T
-40°C to +125°C 8 SOT23 AADE
MAX6372KA-T
-40°C to +125°C 8 SOT23
AADF
MAX6373KA-T
-40°C to +125°C 8 SOT23 AADG
MAX6374KA-T
-40°C to +125°C 8 SOT23 AADH
Note: All devices are available in tape-and-reel only. Required
order increment is 2,500 pieces.
/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.
Pin Configuration appears at end of data sheet.
Selector Guide
PART
MAX6369
MAX6370
MAX6371
MAX6372
MAX6373
MAX6374
OUTPUT
Open Drain
Push-Pull
Open Drain
Push-Pull
Open Drain
Push-Pull
WDO PULSE
WIDTH (ms)
100
1
100
1
100
1
MINIMUM STARTUP DELAY
MINIMUM WATCHDOG TIMEOUT
Selectable: 1ms to 60s
Selectable: 1ms to 60s
60s
60s
Selectable: 200µs to 60s or first edge
Selectable: 200µs to 60s or first edge
Selectable: 1ms to 60s
Selectable: 1ms to 60s
Selectable: 1ms to 60s
Selectable: 1ms to 60s
Selectable: 30µs to 10s
Selectable: 30µs to 10s
________________________________________________________________ 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.