Datasheet MAX6369, MAX6370, MAX6371, MAX6372, MAX6373, MAX6374 (Maxim)

19-1676; Rev 1; 7/00
Pin-Selectable Watchdog Timers MAX6369–MAX6374 General Description Features
The MAX6369–MAX6374 are pin-selectable watchdog ♦
Precision Watchdog Timer for Critical
timers that supervise microprocessor (µP) activity and
µP Applications
signal when a system is operating improperly. During normal operation, the microprocessor should repeated- ♦
Pin-Selectable Watchdog Timeout Periods
ly toggle the watchdog input (WDI) before the selected ♦
Pin-Selectable Watchdog Startup Delay Periods
watchdog timeout period elapses to demonstrate that the system is processing code properly. If the µP does ♦
Ability to Change Watchdog Timing Characteristics
not provide a valid watchdog input transition before the
Without Power Cycling
timeout period expires, the supervisor asserts a watch- ♦
Open-Drain or Push-Pull Pulsed Active-Low
dog (WDO) output to signal that the system is not exe- cuting the desired instructions within the expected time
Watchdog Output
frame. The watchdog output pulse can be used to reset ♦
Watchdog Timer Disable Feature
the µP or interrupt the system to warn of processing ♦
+2.5V to +5.5V Operating Voltage
errors. The MAX6369–MAX6374 are flexible watchdog timer ♦
8µA Low Supply Current
supervisors that can increase system reliability through ♦
No External Components Required
notification of code execution errors. The family offers several pin-selectable watchdog timing options to ♦
Miniature 8-Pin SOT23 Package
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-
Ordering Information
dog timeout period after the initial startup delay.
TEMP. PIN- TOP
• Watchdog output/timing options: open drain (100ms)
PART RANGE PACKAGE MARKS
or push-pull (1ms).
MAX6369
KA-T -40°C to +85°C 8 SOT23-8 AADC The MAX6369–MAX6374 operate over a +2.5V to +5.5V
MAX6370
KA-T -40°C to +85°C 8 SOT23-8 AADD supply range and are available in miniature 8-pin SOT23 packages.
MAX6371
KA-T -40°C to +85°C 8 SOT23-8 AADE
MAX6372
KA-T -40°C to +85°C 8 SOT23-8 AADF
________________________Applications MAX6373
KA-T -40°C to +85°C 8 SOT23-8 AADG Embedded Control Systems
MAX6374
KA-T -40°C to +85°C 8 SOT23-8 AADH Industrial Controllers
Note:
All devices are available in tape-and-reel only. Required Critical µP and Microcontroller (µC) Monitoring order increment is 2,500 pieces. Automotive Telecommunications
Pin Configuration appears at end of data sheet.
Networking
Selector Guide WDO PULSE PART OUTPUT MINIMUM STARTUP DELAY MINIMUM WATCHDOG TIMEOUT WIDTH (ms)
MAX6369 Open Drain 100 Selectable: 1ms to 60s S el ectab le: 1ms to 60s MAX6370 Push-Pull 1 Selectable: 1ms to 60s S el ectab le: 1ms to 60s MAX6371 Open Drain 100 60s S el ectab le: 1ms to 60s MAX6372 Push-Pull 1 60s S el ectab le: 1ms to 60s MAX6373 Open Drain 100 S el ectab le: 200µs to 60s or fi rst ed ge S el ectab le: 30µs to 10s MAX6374 Push-Pull 1 S el ectab le: 200µs to 60s or fi rst ed ge S el ectab le: 30µs to 10s
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