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TPS3305 датащи(PDF) 2 Page - Texas Instruments |
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TPS3305 датащи(HTML) 2 Page - Texas Instruments |
2 / 13 page TPS3305-18, TPS3305-25, TPS3305-33 DUAL PROCESSOR SUPERVISORS SLVS198 – DECEMBER 1998 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) The various supply voltage supervisors are designed to monitor the nominal supply voltage, as shown in the following supply voltage monitoring table. SUPPLY VOLTAGE MONITORING DEVICE NOMINAL SUPERVISED VOLTAGE THRESHOLD VOLTAGE (TYP) DEVICE SENSE1 SENSE2 SENSE1 SENSE2 TPS3305-18 3.3 V 1.8 V 2.93 V 1.68 V TPS3305-25 3.3 V 2.5 V 2.93 V 2.25 V TPS3305-33 5 V 3.3 V 4.55 V 2.93 V During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the supply voltage supervisor monitors the SENSEn inputs and keeps RESET active as long as SENSEn remains below the threshold voltage VIT+. An internal timer delays the return of the RESET output to the inactive state (high) to ensure proper system reset. The delay time, td typ = 200 ms, starts after SENSE1 and SENSE2 inputs have risen above the threshold voltage VIT+. When the voltage at SENSE1 or SENSE2 input drops below the threshold voltage VIT–, the RESET output becomes active (low) again. The TPS3305-xx devices integrate a watchdog timer that is periodically triggered by a positive or negative transition of WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, tt(out) = 1.6 s, RESET becomes active for the time period td . This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. The TPS3305-xx family of devices incorporates a manual reset input, MR. A low level at MR causes RESET to become active. In addition to the active-low RESET output, the TPS3305-xx family includes an active-high RESET output. The TPS3305-xx devices are available in either 8-pin MSOP or standard 8-pin SO packages. The TPS3305-xx family is characterized for operation over a temperature range of – 40 °C to 85°C. AVAILABLE OPTIONS PACKAGED DEVICES TA SMALL OUTLINE (D) PowerPAD ™ µ-SMALL OUTLINE (DGN) MARKING DGN PACKAGE CHIP FORM (Y) TPS3305-18D TPS3305-18DGN TIAAM TPS3305-18Y –40 _C to 85_C TPS3305-25D TPS3305-25DGN TIAAN TPS3305-25Y TPS3305-33D TPS3305-33DGN TIAAO TPS3305-33Y PowerPAD is a trademark of Texas Instruments Incorporated. |
Аналогичный номер детали - TPS3305 |
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Аналогичное описание - TPS3305 |
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