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