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TPS3705-50DGNG4 Datasheet(PDF) 2 Page - Texas Instruments |
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TPS3705-50DGNG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 21 page TPS3705xx TPS3707xx PROCESSOR SUPERVISORY CIRCUITS WITH POWERFAIL SLVS184C − NOVEMBER 1998 − REVISED DECEMBER 2005 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description The TPS3705, TPS3707 family of microprocessor supply-voltage supervisors provide circuit initialization and timing supervision, primarily for DSP and processor-based systems. During power-on, RESET is asserted when the supply voltage VDD becomes higher than 1.1 V. Thereafter, the supply voltage supervisor 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, tdtyp= 200 ms, 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. The TPS3705-xx and TPS3707-xx devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active. The TPS370x-xx families integrate a power-fail comparator which can be used for low-battery detection, power-fail warning, or for monitoring a power supply other than the main supply. The TPS3705-xx devices have a watchdog timer that is periodically triggered by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval, tt(out) = 1.6 s, WDO becomes active. This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. The TPS3707-xx devices do not have the Watchdog function, but include a high-level output RESET. The product spectrum is designed for supply voltages of 2.5 V, 3 V, 3.3 V, and 5 V. The circuits are available in either 8-pin MSOP or standard SOIC packages. The TPS3705, TPS3707 devices are characterized for operation over a temperature range of −40 °C to 85°C. AVAILABLE OPTIONS PACKAGED DEVICES TA THRESHOLD VOLTAGE SMALL OUTLINE (D) POWER−PAD µ-SMALL OUTLINE (DGN) MARKING DGN PACKAGE CHIP FORM (Y) 2.63 V TPS3705−30D TPS3705−30DGN TIAAT TPS3705-30Y 2.93 V TPS3705−33D TPS3705−33DGN TIAAU TPS3705−33Y 4.55 V TPS3705−50D TPS3705−50DGN TIAAV TPS3705−50Y −40 °C to 85°C 2.25 V TPS3707−25D TPS3707−25DGN TIAAW TPS3707−25Y −40 C to 85 C 2.63 V TPS3707−30D TPS3707−30DGN TIAAX TPS3707−30Y 2.93 V TPS3707−33D TPS3707−33DGN TIAAY TPS3707−33Y 4.55 V TPS3707−50D TPS3707−50DGN TIAAZ TPS3707−50Y |
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