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Reset & watchdog ICs

TPS3823-Q1

ACTIVE

Active-low, push-pull, automotive voltage supervisor (reset IC) with 1.6-s watchdog & manual reset

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Data sheet

TPS3823-Q1

ACTIVE
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Product details

Rating Automotive Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.25, 2.93, 4.55 Features Manual reset capable, Undervoltage monitor only, Watchdog timer Reset threshold accuracy (%) 2.4 Iq (typ) (mA) 0.015 Output driver type/reset output Active-low, Push-Pull Time delay (ms) 200 Watchdog timer WDI (s) 1.6 Operating temperature range (°C) -40 to 125
Rating Automotive Number of supplies monitored 1 Threshold voltage 1 (typ) (V) 2.25, 2.93, 4.55 Features Manual reset capable, Undervoltage monitor only, Watchdog timer Reset threshold accuracy (%) 2.4 Iq (typ) (mA) 0.015 Output driver type/reset output Active-low, Push-Pull Time delay (ms) 200 Watchdog timer WDI (s) 1.6 Operating temperature range (°C) -40 to 125
SOT-23 (DBV) 5 8.12 mm² (2.9 mm × 2.8 mm)
  • Qualified for automotive applications
  • AEC-Q100 Qualified With the Following Results:
    • Device temperature grade 1: –40°C to 125°C
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • ESD protection exceeds 2000V Per MIL-STD-883, Method 3015; using human body model (C = 100pF, R = 1500Ω)
  • Power-on reset generator with fixed delay time of 200ms (TPS3823/4/5/8-xx-Q1) or 25ms (TPS3820-xx-Q1)
  • Manual reset input (TPS3820/3/5/8-xx-Q1)
  • Reset output available in active-low (TPS3820/3/4/5-xx-Q1), Active-High (TPS3824/5-xx-Q1), and open drain (TPS3828-xx-Q1)
  • Supply voltage supervision range: 2.5V, 3V, 3.3V, 5V
  • Watchdog timer (TPS3820/3/4/8-xx-Q1)
  • Supply current of 15µA (typical)
  • 5-Pin SOT-23 package
  • Temperature range: −40°C to 125°C
  • Qualified for automotive applications
  • AEC-Q100 Qualified With the Following Results:
    • Device temperature grade 1: –40°C to 125°C
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • ESD protection exceeds 2000V Per MIL-STD-883, Method 3015; using human body model (C = 100pF, R = 1500Ω)
  • Power-on reset generator with fixed delay time of 200ms (TPS3823/4/5/8-xx-Q1) or 25ms (TPS3820-xx-Q1)
  • Manual reset input (TPS3820/3/5/8-xx-Q1)
  • Reset output available in active-low (TPS3820/3/4/5-xx-Q1), Active-High (TPS3824/5-xx-Q1), and open drain (TPS3828-xx-Q1)
  • Supply voltage supervision range: 2.5V, 3V, 3.3V, 5V
  • Watchdog timer (TPS3820/3/4/8-xx-Q1)
  • Supply current of 15µA (typical)
  • 5-Pin SOT-23 package
  • Temperature range: −40°C to 125°C

For all new designs with TPS3820-xx-Q1, use the TPS3820-xxQPDBVRQ1 part number. The TPS3820-xxQP is functionally equivalent and a replacement to the TPS3820xxQ. The TPS3820-xxQDBVRQ1 is not recommended for new designs (NRND).

The TPS382x-xx-Q1 family of supervisors provide circuit initialization and timing supervision, primarily for DSP and processor-based systems. During power on, RESET asserts when the supply voltage VDD becomes greater than 1.1V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET active low 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 verify a 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. The TPS382x-xx-Q1 family also offers watchdog time out options of 200ms (TPS3820-xx-Q1) and 1.6s (TPS3823/4/8-xx-Q1).

For all new designs with TPS3820-xx-Q1, use the TPS3820-xxQPDBVRQ1 part number. The TPS3820-xxQP is functionally equivalent and a replacement to the TPS3820xxQ. The TPS3820-xxQDBVRQ1 is not recommended for new designs (NRND).

The TPS382x-xx-Q1 family of supervisors provide circuit initialization and timing supervision, primarily for DSP and processor-based systems. During power on, RESET asserts when the supply voltage VDD becomes greater than 1.1V. Thereafter, the supply voltage supervisor monitors VDD and keeps RESET active low 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 verify a 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. The TPS382x-xx-Q1 family also offers watchdog time out options of 200ms (TPS3820-xx-Q1) and 1.6s (TPS3823/4/8-xx-Q1).
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet TPS382x-xx-Q1 Voltage Monitor With Watchdog Timer datasheet (Rev. E) PDF | HTML Mar 19, 2025
Application note Voltage Supervisors (Reset ICs): Frequently Asked Questions (FAQs) (Rev. A) Mar 17, 2020
Functional safety information TPS382x-Q1 Functional Safety FIT Rate and Failure Mode Distribution Dec 19, 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics Jun 28, 2019
Application brief Latching a Voltage Supervisor (Reset IC) (Rev. A) Apr 5, 2019
Application note Disabling the Watchdog Timer for TI's Family of Supervisors Oct 30, 2003

Design & development

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Evaluation board

TPS382-Q1EVM — Evaluation module for the TPS382x-Q1 voltage supervisors with integrated watchdog

The TPS382-Q1EVM evaluation module (EVM) has five different TPS382x-Q1 devices to let you evaluate and test the different features of the product family.  The EVM includes devices with 2.5-V, 3-V, 3.3-V and 5-V fixed monitoring, watchdog input, manual reset, (...)
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