DS1817

Features:

Automatically restarts a microprocessor after power failure
Maintains reset for 150 ms after V_CCreturns to an in-tolerance condition
Reduces need for discrete components
Precision temperature-compensated voltage reference and voltage sensor
Accurate 5%, 10% or 20% power monitoring
20% tolerance for use with 3.0-volt systems
Low-cost TO-92 or space saving surface mount SOT-23 packages available
Push-pull active high output
Operating temperature -40°C to +85°C


Pinout




PIN DESCRIPTION
TO-92
1    RST        Active High Reset Output
2    V_CC        Power Supply
3    GND       Ground

SOT-23
1    RST        Active High Reset Output
2    V_CC        Power Supply
3    GND       Ground


Specifications

Voltage on V_CCPin Relative to Ground                                           -0.5V to +7.0V
Voltage on RST Relative to Ground                                        -0.5V to 5V_CC+0.5V
Operating Temperature                                                               -40°C to +85°C
Storage Temperature                                                                -55°C to +125°C
Soldering Temperature                                                      260°C for 10 seconds


This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.


Description

The DS1817 EconoReset uses a precision temperature reference and comparator circuit to monitor the status of the power supply (V_CC). When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces reset to the active state. When V_CC 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.