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TPS3125J18DBVT Datasheet(PDF) 2 Page - Texas Instruments |
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TPS3125J18DBVT Datasheet(HTML) 2 Page - Texas Instruments |
2 / 12 page www.ti.com DESCRIPTION TPS3123-xx TPS3124-xx, TPS3125-xx TPS3126-xx, TPS3128-xx SLVS227B – AUGUST 1999 – REVISED FEBRUARY 2004 The TPS312x family of ultralow voltage processor supervisory circuits provides 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 0.75 V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET output 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 = 180 ms, starts after VDD has risen above the threshold voltage (VIT). When the supply voltage drops below the threshold voltage (V IT), the output becomes active (low) again. No external components are required. All the devices of this family have a fixed-sense threshold voltage (V IT) set by a high precision internal voltage divider. The TPS3123/5/6/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active. The TPS3124 devices do not have the input MR, but include a high-level output RESET same as the TPS3125 and TPS3126 devices. In addition, the TPS3123/4/8 have a watchdog timer that needs to be triggered periodically by a positive or negative transition at WDI. When the supervising system fails to retrigger the watchdog circuit within the time-out interval t tout= 0.8 s, RESET output becomes active for the time period (td). This event also reinitializes the watchdog timer. The circuits are available in a 5-pin SOT23-5 package. The TPS312x devices are characterized for operation over a temperature range of -40 °C to 85°C. PACKAGE INFORMATION STANDARD VERSIONS(1) TA DEVICE NAME THRESHOLD VOLTAGE MARKING TPS3123J12DBVR(2) TPS3123J12DBVT(3) 1.08 V PBNI TPS3123G15DBVR(2) TPS3123G15DBVT(3) 1.40 V PBOI TPS3123J18DBVR(2) TPS3123J18DBVT(3) 1.62 V PBPI TPS3124J12DBVR(2) TPS3124J12DBVT(3) 1.08 V PBQI TPS3124G15DBVR(2) TPS3124G15DBVT(3) 1.40 V PBRI TPS3124J18DBVR(2) TPS3124J18DBVT(3) 1.62 V PBSI TPS3125J12DBVR(2) TPS3125J12DBVT(3) 1.08 V PBTI TPS3125G15DBVR(2) TPS3125G15DBVT(3) 1.40 V PBUI -40 °C to 85°C TPS3125J18DBVR(2) TPS3125J18DBVT(3) 1.62 V PBVI TPS3125L30DBVR(2) TPS3125L30DBVT(3) 2.64 V PBXI TPS3126E12DBVR(2) TPS3126E12DBVT(3) 1.14 V PFOI TPS3126E15DBVR(2) TPS3126E15DBVT(3) 1.43 V PFPI TPS3126E18DBVR(2) TPS3126E18DBVT(3) 1.71 V PFQI TPS3128E12DBVR(2) TPS3128E12DBVT(3) 1.14 V PFRI TPS3128E15DBVR(2) TPS3128E15DBVT(3) 1.43 V PFSI TPS3128E18DBVR(2) TPS3128E18DBVT(3) 1.71 V PFTI (1) Other versions available. Contact Texas Instruments for deetails, minimum order quantities apply. (2) The DBVR passive indicates tape and reel of 3000 parts. (3) The DBVT passive indicates tape and reel of 250 parts. 2 |
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