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CAT824MSDI-GT3 Datasheet(PDF) 1 Page - ON Semiconductor |
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CAT824MSDI-GT3 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 15 page CAT823, CAT824, CAT825 © 2010 SCILLC. All rights reserved. 1 Doc. No. MD-3027, Rev. D Characteristics subject to change without notice System Supervisory Voltage Reset with Watchdog and Manual Reset FEATURES n Automatically restarts microprocessor after Power failure n Monitors pushbutton for external override n Accurate under voltage system monitoring n Brownout detection system reset for use with 3.0, 3.3, and 5.0 volt systems n Pin and function compatible with the MAX823/24/25 products n Operating Range from -40°C to +85°C n Available in TSOT-23 5-lead and SC-70 packages For Ordering Information details, see page 13 & 14. APPLICATIONS n Microprocessor and Microcontroller based systems n Intelligent Instruments n Control Systems n Critical µP Monitors n Portable Equipment 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 push- button or a processor signal. PIN CONFIGURATION TSOT-23 5-Lead SC-70 5-Lead VCC CAT823 MR 2 3 1 WDI 5 4 RESET GND RESET MR VCC CAT824 RESET 2 3 1 WDI 5 4 RESET GND VCC CAT825 RESET 2 3 1 5 4 GND PIN FUNCTIONS Pin Name Function RESET ¯¯¯¯¯¯ CMOS Push-Pull Active Low Reset Output GND Ground MR ¯¯¯ Manual Reset input – Pulled high Internally by a 52k Ω resistor designed to be driven low by a mechanical pushbutton, open drain output or CMOS output. RESET CMOS Push-Pull Active High Reset Output WDI Watchdog Timer Input – Designed to be driven by a processor output or can be disabled by tri-stating or leaving open. VCC Power Supply |
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