Hot-selling and scarce TPS3813K33DBVT Family Processor Supervisory Circuits With Window-Watchdog SOT23-6 spot stock

Product Descriptions

The TPS3813xxx family of supervisory circuits provide circuit  initialization  and  timing  supervision,  primarily for DSPs and processor-based systems.

During  power  on,  RESET  is  asserted when  supply voltage (VDD) becomes higher than 1.1V. Thereafter, the   supervisory   circuit   monitors   V DD    and   keeps RESET  active  as  long  as  V DD   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  = 25ms typical, starts after V DD  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 (VIT) set by an internal voltage divider.

For   safety   critical   applications   the   TPS3813xxx family   incorporates   a   so-called   window-watchdog with  programmable  delay  and  window  ratio.  The upper  limit  of  the  watchdog  time-out  can  be  set by  either  connecting  WDT  to  GND,  V DD,  or  using an  external  capacitor. The  lower  limit  and thus the window  ratio  is set  by connecting WDR to GND or V DD. The supervised processor now needs to trigger the TPS3813xxx within this window  not to assert aRESET.

The product spectrum is designed for supply voltages of 2.5V, 3V, 3.3V, and 5V. The circuits are available in a 6-pin SOT-23 package.

The   TPS3813xxx   devices   are   characterized   for operation over a temperature range of –40°C to 85°C.​

Product Features

•   Window-watchdog with programmable delay and window ratio

•   6-Pin SOT-23 package

•   Supply current of 9µA (typical)

•    Power-on reset generator with a fixed delay time of 25ms

•    Precision supply voltage monitor (VIT):2.5V, 3V, 3.3V, and 5V

•    Open-drain reset output

•   Temperature range: –40°C to 85°C

Product Applications

•   Active Antenna System mMIMO (AAS)

•   Storage area network

•    Electricity meters

•   Safety critical systems

•    Infustion pump

•    HVAC controller

Product Specification

Product Photos

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