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DS1819

Dallas Semiconductor
Part Number DS1819
Manufacturer Dallas Semiconductor
Description 5V/3.3V MicroMonitor
Published Jan 28, 2009
Detailed Description www.DataSheet4U.com DS1814/DS1819 5V and 3.3V MicroMonitor www.maxim-ic.com FEATURES § § § § § § § § § § Halts and re...
Datasheet PDF File DS1819 PDF File

DS1819
DS1819

Overview
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 occurs, an internal power-fail signal is generated which forces the reset(s) to an active state.
When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 140ms to allow the power supply and processor to stabilize.
1 of 8 122001 DS1814/DS1819 The DS1814/DS1819 ‘A’ and ‘C’ perform pushbutton reset control.
They debounce the pushbutton input and generate an active reset pulse width of 140ms minimum.
The DS1814/9 ‘A’ and ‘B’ versions perform a w...


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