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TPS3813L30DBV Datasheet(PDF) 1 Page - Texas Instruments |
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TPS3813L30DBV Datasheet(HTML) 1 Page - Texas Instruments |
1 / 12 page TPS3813J25, TPS3813L30, TPS3813K33, TPS3813I50 PROCESSOR SUPERVISORY CIRCUITS WITH WINDOW-WATCHDOG SLVS331A – DECEMBER 2000 – REVISED APRIL 2001 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 features D Window-Watchdog With Programmable Delay and Window Ratio D 6-Pin SOT-23 Package D Supply Current of 9 µA (Typ) D Power On Reset Generator With a Fixed Delay Time of 25 ms D Precision Supply Voltage Monitor 2.5 V, 3 V, 3.3 V, 5 V D Open-Drain Reset Output D Temperature Range ...–40°C to 85°C typical applications D Applications Using DSPs, Microcontrollers, or Microprocessors D Safety Critical Systems D Automotive Systems D Heating Systems features description The TPS3813 family of supervisory circuits pro- vides circuit initialization and timing supervision, primarily for DSPs and processor-based systems. During power on, RESET is asserted when supply voltage (VDD) becomes higher than 1.1 V. There after, the supervisory circuit monitors VDD and keeps RESET active as long as VDD remains below the threshold voltage (VIT). An internal timer delays the return of the output to the inactive state (high) to ensure proper system reset. The delay time, td = 25 ms typical, starts after VDD has risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (VIT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (VIT) set by an internal voltage divider. For safety critical applications the TPS3813 family incorporates a so-called window-watchdog with programmable delay and window ratio. The upper limit of the watchdog time-out can be set by either connecting WDT to GND, VDD, or using an external capacitor. The lower limit and thus the window ratio is set by connecting WDR to GND or VDD. The supervised processor now needs to trigger the TPS3813 within this window not to assert a RESET. typical operating circuit WDR RESET WDT WDI VDD GND CWP VDD R RESET I/O GND 0.1 µF VDD TPS3813 uC 0.1 µF Copyright 2001, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 3 2 4 6 (TOP VIEW) 1 WDI GND WDT RESET VDD TPS3813 DBV PACKAGE WDR 5 ACTUAL SIZE 3,00 mm x 3,00 mm |
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