DESCRIPTION

The DS1831C Multi-Supply Monitor & Reset monitors up to 4 system voltages: 2.5 volt supply, 3.3 (or 3) volt supply, and 2 additional user configurable voltage monitors. DS1831 power for internal operation comes from the higher voltage level of the 3.3 volt input or the 2.5 volt input. One of these inputs must be greater than 1 volt for device operation. Pushbutton (manual reset) functionality is provided for the 2.5 volt reset, the 3.3 volt reset or for all reset outputs by the master pushbutton. The DS1831D replaces one reference comparator and the master pushbutton with watchdog and the DS1831E replaces the 3.3-volt PBRST with a last reset status output.

FEATURES

■ 2.5V power-on reset
■ 3.3 (or 3V) power-on reset
■ 2 referenced comparators with separate outputs for monitoring additional supplies
■ Internal power is drawn from higher of either the IN2.5V input or the IN3.3V input
■ Excellent for systems designed to operate with multiple power supplies
■ Asserts resets during power transients
■ Pushbutton reset input for system override
■ Maintains reset for user configurable times of 10 ms, 100 ms, or 1 sec
■ Watchdog timer for software monitoring (DS1831D)
■ Precision temperature-compensated voltage reference and voltage sensor
■ 16 pin DIP & 16 pin 150 mil SOIC available
■ Operating Temperature of -40°C to +85°C