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TPS3306-33 Datasheet(PDF) 2 Page - Texas Instruments |
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TPS3306-33 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 16 page TPS330615Q1, TPS330618Q1, TPS330620Q1, TPS330625Q1, TPS330633Q1 DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWER FAIL SGLS241B − MARCH 2004 − REVISED APRIL 2008 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description (continued) The various supervisory circuits 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 TPS3306-15 3.3 V 1.5 V 2.93 V 1.4 V TPS3306-18 3.3 V 1.8 V 2.93 V 1.68 V TPS3306-20 3.3 V 2 V 2.93 V 1.85 V TPS3306-25 3.3 V 2.5 V 2.93 V 2.25 V TPS3306-33 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 supervisory circuits monitor the SENSEn inputs and keep 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) = 100 ms, starts after SENSE1 and SENSE2 inputs have risen above VIT. When the voltage at SENSE1 or SENSE2 input drops below the VIT, the output becomes active (low) again. The integrated power-fail (PFI) comparator with separate open-drain (PFO) output can be used for low-battery detection, power-fail warning, or for monitoring a power supply other than the main supply. The TPS3306-xx devices integrate a watchdog timer that is periodically triggered by a positive or negative transition of the watch-dog timer (WDI). When the supervising system fails to retrigger the watchdog circuit within the time-out interval, tt(out) = 0.50 s, RESET becomes active for the time period td . This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. The TPS3306-xx devices are available in standard 8-pin SO packages. The TPS3306-xxQ family is characterized for operation over a temperature range of −40 °C to 125°C. AVAILABLE OPTIONS{ TA PACKAGED DEVICES} TOP-SIDE TA SMALL OUTLINE (D) TOP-SIDE MARKING Tape and reel TPS3306-15QDRQ1 615Q1 Tape and reel TPS3306-18QDRQ1 618Q1 −40 _C to 125_C Tape and reel TPS3306-20QDRQ1 620Q1 −40 C to 125 C Tape and reel TPS3306-25QDRQ1 625Q1 Tape and reel TPS3306-33QDRQ1 633Q1 † For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at http://www.ti.com. ‡ Package drawings, thermal data, and symbolization are available at http://www.ti.com/packaging. |
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