Datasheet for the Maxim MAX691 microprocessor supervisory circuit, which combines power-on reset generation, a watchdog timer, battery backup switchover and memory write protection. The 774 KB PDF includes pin descriptions, threshold voltages, timing diagrams and typical connections. When a microcontroller board resets constantly or fails to start, this document helps you check the reset output, watchdog input activity and backup battery switching, and decide whether the supervisor or the processor it monitors is at fault.
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