MAX6369–MAX6374 Pin-Programmable Watchdog Timers

The MAX6369-MAX6374's pin-selectable watchdog timer activates a microprocessor (MCU) and signals the system to operate. In normal operation, the MCU repeatedly toggles the watchdog input before the selected watchdog timeout period. If the MCU does not provide a valid watchdog input, the system does not execute the expected instructions. The watchdog output pulse can be used to reset the MCU or interrupt the system to warn of a processing error.

The MAX6369-MAX6374 are flexible watchdog timers that can improve system reliability by notifying code execution errors. This family offers a variety of pin-selectable watchdog timing options to match a wide range of system timing applications:

Watchdog Start Delay: A delay is provided before an initial watchdog timer starts.

Watchdog timeout period: Watchdog timeout period delay at initial startup after normal operation.

Watchdog output/timing options: open-drain (100 ms) or push-pull (1 ms).

The MAX6369–MAX6374 operate from a +2.5 V to +5.5 V supply range and are available in a tiny 8-pin SOT23 package.

Key Features

Watchdog Timer for Critical Precision Microprocessor Applications

Pin-selectable watchdog timeout period

Pin-selectable watchdog start-up delay period

No ability to change watchdog timing characteristics during power cycle

Open-drain or push-pull pulse low watchdog output

Watchdog timer disable function

+2.5 V to +5.5 V operating voltage

8μA low supply current

No external components required

Tiny 8-pin SOT23 package