Texas Instruments TPS3824-25DBVT

Overview

TPS3824-25DBVT from Texas Instruments is a voltage supervisor IC with integrated watchdog timer, active-high and active-low reset outputs, and 2.5V supply voltage monitoring. It delivers 200ms power-on reset delay, 1.6s watchdog timeout, 15μA typical supply current, and operates across −40°C to 85°C. It is used in microcontroller-based systems requiring reliable power sequencing and fault recovery.

For engineers reviewing the TPS3824-25DBVT datasheet, TPS3824-25DBVT pinout, TPS3824-25DBVT application, or TPS3824-25DBVT equivalent, key selection criteria include its dual-reset output logic (RESET and RESET), fixed 2.5V threshold with 30mV hysteresis, SOT-23-5 package compatibility, and watchdog timer behavior requiring WDI edge transitions every 1.6s to prevent reset assertion.

Technical Context

The TPS3824-25DBVT implements a precision bandgap reference and comparator-based supervision architecture with internal voltage divider setting VIT− = 2.25V (±2.5%). Its watchdog timer resets on missing falling edges at WDI beyond 1.6s, and its dual-output stage provides simultaneous push-pull active-low (RESET) and active-high (RESET) signals for flexible interface with diverse host logic families.

Reset assertion occurs when VDD falls below VIT− (2.25V), and deassertion is delayed by 200ms after VDD rises above VIT− + VHYS (2.28V). The MR input forces immediate reset regardless of VDD or watchdog state, and internal 90kΩ pullup ensures defined logic level when left unconnected.

Key Specifications

Pinout & Package

TPS3824-25DBVT uses a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision applications.

Compared with TPS3823-25DBVT and TPS3825-25DBVT, the TPS3824-25DBVT uniquely delivers both active-high and active-low reset outputs plus watchdog supervision-enabling single-chip coverage of power-on sequencing, manual reset, and runtime fault recovery without external components.

Availability

TPS3824-25DBVT is available at Aetrix Electronics and suitable for microcontroller power sequencing, industrial PLC monitoring, portable medical device safety, and battery-powered wireless sensor applications requiring stable component supply and long-term manufacturability.

Supply support for TPS3824-25DBVT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TPS382x product line was designed specifically for reliable power-on initialization and runtime supervision of DSPs, microcontrollers, and microprocessors-emphasizing low quiescent current, fixed-threshold accuracy, and integrated watchdog functionality in minimal footprint packages.

FAQ

What is the exact supply voltage threshold for TPS3824-25DBVT?

The TPS3824-25DBVT has a fixed negative-going input threshold voltage (VIT−) of 2.25V ±2.5%, specified over −40°C to 85°C. This value is set by an internal resistor divider and applies directly to the VDD pin; no external components are needed to configure the 2.5V supervision point. The hysteresis is 30mV, resulting in a turn-on threshold of 2.28V.

Does TPS3824-25DBVT support both active-high and active-low reset outputs simultaneously?

Yes, the TPS3824-25DBVT provides two independent reset outputs: RESET (Pin 1) is active-low push-pull, and RESET (Pin 3) is active-high push-pull. Both outputs assert/deassert in synchrony based on VDD monitoring and watchdog status. This dual-output architecture eliminates the need for external inverters or level-shifting circuitry in systems requiring mixed reset polarity interfaces.

How does the watchdog timer in TPS3824-25DBVT operate, and what is its timeout period?

The TPS3824-25DBVT watchdog timer requires a falling edge on the WDI pin at least once every 1.6 seconds (nominal) to remain inactive. If no qualifying edge occurs within that interval, RESET and RESET assert for 200ms. The timer clears on any WDI falling edge or when reset is asserted. Floating WDI generates internal pulses to prevent spurious timeout, but a 1kΩ pull-down is recommended if that behavior is undesirable.

What is the function of the MR pin on TPS3824-25DBVT, and how should it be used?

The MR (manual reset) pin on TPS3824-25DBVT is an active-low input that forces immediate assertion of both RESET and RESET outputs regardless of VDD level or watchdog state. It features an internal 90kΩ pullup to VDD, so leaving it unconnected maintains a logic-high idle state. To trigger reset, drive MR low for ≥1µs; reset remains active for the full 200ms delay after MR returns high.

Is TPS3824-25DBVT compatible with 3.3V or 5V supply rails, or only 2.5V?

The TPS3824-25DBVT is specifically configured for 2.5V supply supervision, with VIT− = 2.25V. It operates from VDD = 1.1V to 5.5V, but its threshold is fixed and not adjustable. For 3.3V or 5V rails, TI offers TPS3824-33DBVT (2.93V threshold) and TPS3824-50DBVT (4.55V threshold), respectively. Using TPS3824-25DBVT on higher rails will cause premature reset assertion and is not recommended.