MAXIM DS1818R-5+T&R

The DS1818 EconoReset uses a precision temperature-compensated reference and comparator circuit to monitor the status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 150 ms to allow the power supply and processor to stabilize. The DS1818 also monitors a pushbutton on the reset output. If the reset line is pulled low, a reset is generated upon release and the DS1818 output will be held in reset output low for typically 150 ms.

• Improves Reliability of Processor Operation
• Temperature-Compensated Voltage Monitor for Precise, Automated PowerFail Detection
• Automatically Restarts a Microprocessor After Power Failure
• Maintains Reset for 150ms After VCC Returns to Tolerance for Processor Stabilization
• Monitors Pushbutton for External Override
• Active-Low Reset Output Efficient Open-Drain Output with Internal 5.5kΩ Pullup Resistor Saves Power and Space
• 35μA (max) Quiescent Current
• Allows for Easy Design with No Complicated Settings
• Fixed 3.3V Reset Threshold
• 5%, 10%, and 20% Tolerance Versions Available
• Operates in Most Commercial and Industrial Environments
• -40°C to +85°C Operating Temperature Range
• MXD1818 Offers Improved Performance over the DS1818