Texas Instruments TPS3824-25DBVR

Overview

TPS3824-25DBVR from Texas Instruments is a voltage supervisor IC with integrated watchdog timer, fixed 2.5V supply threshold, active-high and active-low reset outputs, and 200ms reset delay. It operates from 1.1V to 5.5V, draws 15μA typical supply current, and is housed in a 5-pin SOT-23 package for microcontroller power-on reset and fault recovery in battery-powered systems.

For engineers reviewing the TPS3824-25DBVR datasheet, TPS3824-25DBVR pinout, TPS3824-25DBVR application, or TPS3824-25DBVR equivalent, key selection criteria include its dual-reset-output capability (RESET and RESET), 2.25V nominal threshold with ±50mV hysteresis, 1.6s watchdog timeout, manual reset input support, and compatibility with 3.3V/5V processor rails requiring robust brownout detection and system-level fault containment.

Technical Context

The TPS3824-25DBVR implements a precision bandgap-based voltage reference and comparator to monitor VDD against a fixed 2.25V threshold (VIT−), with 50mV hysteresis to prevent chatter during supply transients. Its internal oscillator drives both the 200ms power-on reset delay timer and the 1.6s watchdog timeout circuit, which resets on WDI pin edge transitions.

It features dual output stages: an active-low push-pull RESET and an active-high push-pull RESET - enabling direct interface to processors with either reset polarity requirement without external inverters. The MR input provides asynchronous reset assertion independent of VDD level or watchdog state.

Key Specifications

Pinout & Package

TPS3824-25DBVR uses a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts in portable electronics and embedded controllers.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3824-25DBVR, TPS3823-25DBVR reduces pin count and simplifies routing at the cost of losing active-high reset flexibility, while TPS3825-25DBVR trades watchdog coverage for dedicated manual reset control-making each alternative optimal only when those specific features are excluded from the system's fault-handling requirements.

Availability

TPS3824-25DBVR is available at Aetrix Electronics and suitable for microcontroller power sequencing, battery-powered sensor nodes, industrial programmable logic controllers, and wireless communication module reset management requiring stable component supply and long-term manufacturability.

Supply support for TPS3824-25DBVR 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 leader delivering analog and embedded processing solutions, with deep expertise in power management, signal chain, and real-time control ICs.

The TPS382x family is designed specifically for reliable power-on reset generation and system-level fault supervision in DSP, microcontroller, and microprocessor-based systems-emphasizing low power, small footprint, and deterministic timing behavior.

FAQ

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

The TPS3824-25DBVR has a nominal negative-going input threshold voltage (VIT−) of 2.25V, with guaranteed range of 2.20V to 2.30V over −40°C to +85°C. This threshold is factory-trimmed and fixed, enabling precise 2.5V rail supervision without external components. The device asserts reset when VDD falls below this value and releases it after VDD rises above VIT− + 50mV hysteresis.

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

Yes, TPS3824-25DBVR provides two independent reset outputs: an active-low RESET (Pin 1) and an active-high RESET (Pin 3). Both are push-pull and driven concurrently during reset assertion. This dual-output architecture allows direct connection to processors requiring either polarity-eliminating external inverters or level translators in mixed-system designs.

What is the watchdog timeout period for TPS3824-25DBVR, and how is it triggered?

The TPS3824-25DBVR features a 1.6s typical watchdog timeout (ttout), with min/max of 0.9s/2.5s. It is triggered by absence of a falling edge on the WDI pin within the timeout window. Each valid falling edge clears the timer; if WDI remains static (high or low) beyond ttout, RESET and RESET assert for the 200ms delay period. Floating WDI generates internal pulses to prevent spurious timeout.

Can TPS3824-25DBVR operate with supply voltages below 2.5V?

Yes, TPS3824-25DBVR functions across VDD = 1.1V to 5.5V. While its internal threshold is fixed at ~2.25V for 2.5V rail supervision, the device itself powers up and monitors correctly even when VDD is as low as 1.1V. This enables use in multi-rail systems where the supervisor runs from a separate low-voltage auxiliary supply while monitoring a higher main rail.

How does the manual reset (MR) input behave on TPS3824-25DBVR?

The MR input on TPS3824-25DBVR is active-low and internally pulled up to VDD (~90kΩ). Pulling MR low forces immediate assertion of both RESET and RESET outputs, overriding VDD level and watchdog state. RESET remains asserted for the full 200ms delay after MR returns high. Leaving MR unconnected or tied to VDD disables manual reset functionality.