(CAT823 - CAT825) System Supervisory Voltage Reset
Description
CAT823, CAT824, CAT825
System Supervisory Voltage Reset with Watchdog and Manual Reset
FEATURES
Automatically restarts microprocessor after Power failure Monitors pushbutton for external override Accurate under voltage system monitoring
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DESCRIPTION
The CAT823, CAT824, and CAT825 provide basic reset and monitoring functions for the electronic systems.
Each device monitors the system voltage and maintains a reset output until that voltage reaches the device’s specified trip value and then maintains the reset output active condition until the device’s internal timer, after a minimum timer of 140ms; to allow the systems power supply to stabilize.
The CAT823 and CAT824 also have a watchdog input which can be used to monitor a system signal and cause a reset to be issued if the signal fails to change state prior to a timeout condition.
The CAT823 and CAT825 also provide a manual reset input which can be used to initiate reset if pulled low.
This input can be directly attached to a pushbutton or a processor signal.
Brownout detection system reset for use with 3.
0, 3.
3, and 5.
0 volt systems Pin and function compatible with the MAX823/24/25 products Operating Range from -40°C to +85°C Available in TSOT-23 5-lead and SC-70 packages For Ordering Information details, see page 13.
APPLICATIONS
Microprocessor and Microcontroller based systems Intelligent Instruments Control Systems Critical µP Monitors Portable Equipment
PIN CONFIGURATION
TSOT-23 5-Lead SC-70 5-Lead
RESET GND MR 1 2 3 5 VCC RESET GND 4 WDI RESET 1 2 3 5 VCC
PIN FUNCTIONS
Pin Name ¯¯¯¯¯¯ RESET GND Function CMOS Push-Pull Active Low Reset Output Ground Manual Reset input – Pulled high Internally by a 52kΩ resistor designed to be driven low by a mechanical pushbutton, open drain output or CMOS output.
CMOS Push-Pull Active High Reset Output Watchdog Timer Input – Designed to be driven by a processor output or can be disabled by tri-stating or leaving open.
Power Supp...
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