MAX6369

The MAX6369 are pin-selectable watchdog timers that supervise microprocessor (P) activity and signal when a system is operating improperly. During normal operation, the microprocessor MAX6369 should repeatedly toggle the watchdog input (WDI) before the selected watchdog timeout period elapses to demonstrate that the system is processing code properly. If the P does not provide a valid watchdog input transition before the timeout period expires, the supervisor asserts a watchdog (WDO) output to signal that the system is not executing the desired instructions within the expected time frame. The watchdog output pulse of MAX6369 can be used to reset the P or interrupt the system to warn of processing errors.

The MAX6369 are flexible watchdog timer supervisors that can increase system reliability through notification of code execution errors. The MAX6369 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 watchdog timeout period after the initial startup delay.
• Watchdog output/timing options: open drain (100ms) or push-pull (1ms). The MAX6369 operate over a +2.5V to +5.5V supply range and are available in miniature 8-pin SOT23 packages.