CAT824 Datasheet | Catalyst Semiconductor

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 .. 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 patible 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...