DESCRIPTION

The DS1814 5-Volt MicroMonitor and the DS1819 3.3V MicroMonitor monitor three vital conditions for a microprocessor: power supply, software execution, and external override. First,a precision temperature compensated reference and comparator circuit monitor the status of VCC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces the reset(s) to an active state. When VCCreturns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 140ms to allow the power supply and processor to stabilize.

FEATURES

Halts and restarts an out-of-control microprocessor

Holds microprocessor in check during power transients

Automatically restarts microprocessor after power failure

Monitors pushbutton for external override

Accurate 5%, 10%, or 20% (3V only) microprocessor power monitoring

Eliminates the need for discrete components

20% tolerance for use with 3.0V systems

Pin- and function-compatible with the MAX823/24/25 products

Low cost SOT-23-5 package

Industrial temperature range: -40
C to +85
C