Details, datasheet, quote on part number: TPS3820-33DBVT
PartTPS3820-33DBVT
CategorySemiconductors => Power Management => Supervisor and Reset IC
Part familyTPS3820 Voltage Monitor With Watchdog Timer
DescriptionVoltage Monitor With Watchdog Timer 5-SOT-23 -40 to 85
CompanyTexas Instruments, Inc.
StatusACTIVE
ROHSY
SampleYes
DatasheetDownload TPS3820-33DBVT datasheet
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Specifications 
Operating Temperature Range(C)-40 to 85
Package GroupSOT-23
RatingCatalog
Output Driver Type / Reset OutputActive-low,Push-pull
Iq(Typ)(uA)15
Watchdog Timer WDI(sec)0.2
# of Supplies Monitored1
Monitored Voltage 1 (typ)(Nom)(V)3.3,5
FeaturesActive Low Enable,Manual Reset,Watchdog Timer
VCC(Min)(V)1.1
VCC(Max)(V)5.5
Reset Threshold Accuracy(%)2.4
Approx. Price (US$)0.65 | 1ku
Monitored Voltage 2 (typ)(Nom)(V)N/A
Threshold Voltage 2 (typ)(Typ)(V)N/A
Threshold Voltage 1(Typ)(V)2.93,4.55
Time Delay(ms)25
  Mecanical Data
Pin nbPackage typeInd stdJEDEC codePackage qtyCarrierDevice markWidth (mm)Length (mm)Thick (mm)Pitch (mm)
5DBVSOT-23R-PDSO-G250SMALL T&RPDEI 1.62.91.2.95

 

Features, Applications

features

Delay Time ms (TPS3820) Manual Reset Input (TPS3820/3/5/8) Reset Output Available in Active-Low (TPS3820/3/4/5), Active-High (TPS3824) and Open-Drain (TPS3828) Supply Voltage Supervision Range 5 V Watchdog Timer (TPS3820/3/4/8) Supply Current 15 µA (Typ) SOT23-5 Package Temperature Range. to 85°C

applications

or Microprocessors Industrial Equipment Programmable Controls Automotive Systems Portable/Battery-Powered Equipment Intelligent Instruments Wireless Communications Systems Notebook/Desktop Computers

description

The TPS382x family of supervisors provides circuit initialization and timing supervision, primarily for DSP and processor-based systems.

During power-on, RESET is asserted when GND 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, td, 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.

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.

This document contains information on products in more than one phase of development. The status of each device is indicated on the page(s) specifying its electrical characteristics.

The TPS3820/3/5/8 devices incorporate a manual reset input, MR. A low level at MR causes RESET to become active. The TPS3824/5 devices include a high-level output RESET. TPS3820/3/4/8 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, ttout, RESET becomes active for the time period td. This event also reinitializes the watchdog timer. Leaving WDI unconnected disables the watchdog. In applications where the input to the WDI pin may be active (transitioning high and low) when the TPS3820/3/4/8 is asserting RESET, the TPS3820/3/4/8 does not return to a non-reset state when the input voltage is above Vt. If the application requires that input to WDI is active when RESET is asserted, WDI must be decoupled from the active signal. This can be accomplished by using an N-channel FET in series with the WDI pin, with the gate of the FET connected to the RESET output as shown in Figure 1.

Figure 1 The product spectrum is designed for supply voltages 3.3 V, and 5 V. The circuits are available 5-pin SOT23-5 package. The TPS382x devices are characterized for operation over a temperature range to 85°C.

PACKAGE INFORMATION DEVICE NAME TPS3828-33DBVT TPS3828-50DBVT DEVICE NAME TPS3828-33DBVR TPS3828-50DBVR THRESHOLD VOLTAGE§ 4.55 V MARKING PDEI PDDI PAPI PAQI PARI PASI PATI PAUI PAVI PAWI PDGI PDFI PDII PDHI

The DBVT package indicates tape and reel of 250 parts. The DBVR package indicates tape and reel of 3000 parts. § For other threshold voltage versions, please contact the local TI sales office.

FUNCTION/TRUTH TABLE INPUTS MR¶ # TPS3824/5 VDD>VIT OUTPUTS RESET RESET#

 

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