Maker : Catalyst Semiconductor
Part No. : CAT825

  Datasheet PDF : CAT825.pdf
  Cross Reference : CAT825 Cross Reference
  Buy Component : CAT825 Find Stock and Price

Shortcut : CAT823  CAT824  CAT825 

Product Information

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 www.DataSheet4U.com 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 Supply CAT823 CAT824 4 WDI ¯¯¯ MR RESET RESET GND RESET 1 2 3 5 VCC CAT825 4 MR WDI VCC © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. MD-3027, Rev. B CAT823, CAT824, CAT825 BLOCK DIAGRAM VCC WDI* LEVEL SENSE & TIMER TIMEOUT COMPARATOR RESET VCC VCC TOLERANCE BIAS + – DIGITAL DELAY VCC www.DataSheet4U.com VCC VOLTAGE REFERENCE RESET* 52kΩ MR* LEVEL SENSE & DEBOUNCE * Functions Available by Device Device CAT823 CAT824 CAT825 ¯¯¯¯¯¯ RESET x x x RESET x x ¯¯¯ MR x x WDI x x Doc. No. MD-3027, Rev. B 2 © Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT823, CAT824, CAT825 ABSOLUTE MAXIMUM RATINGS (1) Parameters Supply Voltage All other pins Input Current, VCC Output Current RST, ¯¯¯¯ RST Continuous Power Dissipations (TA = +70ºC) SC-70 5-lead (derate 3.1mW/ºC above +70ºC) TSOT-23 5-lead (derate 7.1mW/ºC above +70ºC) Storage www.DataSheet4U.com Temperature Operating Ambient Temperature Lead Soldering (10 seconds max) ESD Rating: Low Voltage Pins Human Body Model Machine Model RECOMMENDED OPERATING CONDITIONS Parameter VCC (TA = 0ºC to +70ºC) VCC (TA = -40ºC to +85ºC) All Other Pins Ambient Temperature Range 1.0 to 5.5 1.2 to 5.5 -0.1 to (VCC + 0.1) -40 to +85 Units V V V ºC 247 571 -65 to 150 -40 to +85 +300 2000 200 mW mW ºC ºC ºC V V Ratings 6 -0.3 to (VCC + 0.3) 20 20 Units V V mA mA Notes: (1) Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability. © Catalyst Semiconductor, Inc. Characteristics subject to change without notice 3 Doc. No. MD-3027, Rev. B CAT823, CAT824, CAT825 ELECTRICAL O...

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