DS1814

www.DataSheet4U.com DS1814/DS1819 5V and 3.3V MicroMonitor www.maxim-ic.com 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 RST PIN ASSIGNMENT 3 2 1 4 5 SOT-23-5 PACKAGE See Mech. Drawing PIN DESCRIPTION DS181xA 1 RST 2 GND PBRST 3 4 ST 5 VCC DS181xB 1 RST 2 GND 3 RST 4 ST 5 VCC DS181xC 1 RST 2 GND 3 RST 4 PBRST 5 VCC Active Low Reset Output Ground Pushbutton Reset Input Strobe Input Power Supply DEVICE RST PBRST WD X X DS181xA X DS181xB X X DS181xC X X x = "DS1814" for 5V devices x = "DS1819" for 3V devices X X Active Low Reset Output Ground Active High Reset Output Strobe Input Power Supply Active Low Reset Output Ground Active High Reset Output Pushbutton Reset Input Power Supply 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 temperaturecompensated reference and comparator circuit monitor the status of VCC. When an out-of-tolerance condition...