Product Summary

The DS1818R-20+TR is a 3.3V EconoReset with Pushbutton. The DS1818R-20+TR 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 DS1818R-20+TR also monitors a pushbutton on the reset output. If the reset line is pulled low, a reset is generated upon release and the DS1818R-20+TR output will be held in reset output low for typically 150 ms.

Parametrics

DS1818R-20+TR absolute maximum ratings: (1)Voltage on VCC Pin Relative to Ground: -0.5V to +7.0V; (2)Voltage on RST Relative to Ground: -0.5V to +5VCC +0.5V; (3)Operating Temperature: -40 to +85℃; (4)Storage Temperature: -55 to +125℃; (5)Soldering Temperature: 260℃ for 10 seconds.

Features

DS1818R-20+TR features: (1)Automatically restarts a microprocessor after power failure; (2)Monitors pushbutton for external override; (3)Maintains reset for 150 ms after VCC returns to an in-tolerance condition; (4)Reduces need for discrete components; (5)Precision temperature-compensated voltage reference and voltage sensor; (6)Accurate 5%, 10% or 20% power monitoring; (7)Low-cost TO-92 or space saving surface mount SOT-23 packages available; (8)Efficient open-drain output with internal 5.5 kΩ pull-up resistor; (9)Operating temperature -40 to +85℃.

Diagrams

DS1818R-20+TR block diagram

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