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Voltage monitor with watchdog timer

TPS3828-50DBVR General Description

TPS3828-50DBVR is a member of the TPS382x supervisors tailored for initialization and timing supervision in DSP and processor-centric systems. Its critical function during power on involves the assertion of RESET once the supply voltage VDD surpasses 1.1 V. Subsequently, the voltage supervisor continually monitors VDD, retaining RESET in a low state unless VDD exceeds the predetermined threshold voltage, VIT−. An internal timer deployment ensures the appropriate system reset by introducing a delay (td) upon VDD surpassing the threshold voltage (VIT− + VHYS). Should the supply voltage dip below the threshold voltage VIT−, the output reverts to an active low state. The TPS382x family offers fixed-sense threshold voltage (VIT–) established by an internal voltage divider, eliminating the necessity for external elements. Watchdog time out alternatives include 200 ms (TPS3820) and 1.6 s (TPS3823, TPS3824, and TPS3828)

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Key Features

  • Power-on reset generator with a fixed delay time of 200 ms (TPS3823, TPS3824, TPS3825, and TPS3828) or 25 ms (TPS3820)
  • Manual reset input (TPS3820, TPS3823, TPS3825, and TPS3828)
  • Reset output available in active-low (TPS3820, TPS3823, TPS3824, and TPS3825), active-high (TPS3824 and TPS3825), and open drain (TPS3828)
  • Supply voltage supervision range: 2.5 V, 3 V, 3.3 V, 5 V
  • Watchdog timer (TPS3820, TPS3823, TPS3824, and TPS3828)
  • Supply current of 15 µA (typical)
  • 5-pin SOT-23 package
  • Temperature range: −40°C to 85°C (−40°C to 125°C for TPS3823A-33)
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TI Inventory


Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.93, 4.55
Features Manual reset capable, Watchdog timer Reset threshold accuracy (%) 2.4
Iq (typ) (mA) 0.015 Output driver type/reset output Active-low, Open-drain
Time delay (ms) 200 Supply voltage (min) (V) 1.1
Supply voltage (max) (V) 5.5 Rating Catalog
Watchdog timer WDI (s) 1.6 Operating temperature range (°C) -40 to 85

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