Texas Instruments TPS3824-50DBVR

Overview

TPS3824-50DBVR from Texas Instruments is a voltage supervisor IC with integrated watchdog timer, fixed 5.0V supply monitoring threshold (V_IT− = 4.49–4.64 V), 200ms reset delay, and dual active-high/active-low push-pull RESET outputs. It operates from 1.1V to 5.5V, draws 15µA typical supply current, and is used in microcontroller-based systems requiring reliable power-on reset and fault detection.

For engineers reviewing the TPS3824-50DBVR datasheet, TPS3824-50DBVR pinout, TPS3824-50DBVR application, or TPS3824-50DBVR equivalent, key selection criteria include its 5.0V supervision accuracy, 1.6s watchdog timeout, manual reset input compatibility, SOT-23-5 package footprint, and dual-output logic flexibility for interfacing with both legacy and modern processor reset architectures.

Technical Context

The TPS3824-50DBVR implements a fixed-threshold voltage supervision architecture with internal hysteresis (50mV) and an independent watchdog timer triggered by WDI falling edges. Its reset assertion is initiated when VDD falls below 4.49V and held for 200ms after VDD rises above 4.54V (V_IT− + V_HYS).

It features dual output drivers: active-low RESET (pin 1) and active-high RESET (pin 3), both push-pull, enabling direct connection to processors with either reset polarity requirement. The MR input (pin 4) forces reset independently of VDD level, and the WDI input (pin 5) must be toggled within 1.6s to prevent timeout-induced reset.

Key Specifications

Pinout & Package

TPS3824-50DBVR is housed in a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body size and standard lead pitch. Pin 1 is RESET (active-low), Pin 2 is GND, Pin 3 is RESET (active-high), Pin 4 is MR (manual reset input), and Pin 5 is VDD (supply input). All pins are surface-mount compatible with IPC-7351B footprint requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823-50DBVR, the TPS3824-50DBVR adds active-high reset capability for flexible processor interfacing, while TPS3825-50DBVR offers identical dual-output functionality with confirmed pin-to-pin compatibility - making it the preferred alternative for seamless migration or second-source assurance.

Availability

TPS3824-50DBVR is available at Aetrix Electronics and suitable for industrial automation, medical devices, and wireless infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3824-50DBVR 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 specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in industrial, automotive, and communications markets.

The TPS382x family was designed specifically for robust power-supply monitoring and system-level fault recovery in DSP, microcontroller, and microprocessor applications - emphasizing low power, small footprint, and deterministic reset timing.

FAQ

What is the exact reset threshold voltage range for TPS3824-50DBVR?

The TPS3824-50DBVR has a negative-going input threshold voltage (V_IT−) of 4.49 V (min), 4.55 V (nom), and 4.64 V (max) across −40°C to 85°C. This 5.0V nominal supervision point is factory-trimmed and includes 50mV hysteresis to prevent chatter during slow-rising or noisy supply transitions. The value is specified in Section 6.5 of the SLVS165O datasheet.

Does TPS3824-50DBVR support both active-high and active-low reset outputs simultaneously?

Yes, TPS3824-50DBVR provides two independent reset outputs: pin 1 (RESET) is active-low, and pin 3 (RESET) is active-high - both implemented as push-pull drivers. This dual-output architecture allows direct connection to processors requiring either polarity without external logic, as confirmed in the Pin Functions table (Section 5) and Functional Block Diagram (Section 7.2).

What is the watchdog timeout period for TPS3824-50DBVR, and how is it triggered?

The TPS3824-50DBVR watchdog timeout (t_tout) is 0.9–2.5 seconds, with 1.6s nominal. It is triggered by absence of a falling edge on the WDI pin (pin 5) within that interval. The timer resets on each WDI falling edge and also clears when RESET is asserted. This behavior is documented in Section 7.3.4 and Table 6-8 of the SLVS165O datasheet.

Can the manual reset (MR) input of TPS3824-50DBVR override the watchdog or power-on reset functions?

Yes, the MR input (pin 4) is asynchronous and forces immediate reset assertion regardless of VDD level, watchdog state, or power-on timing. When MR is pulled low, both RESET and RESET go active (low and high respectively) for the full 200ms delay period, even if VDD is within specification. This is explicitly defined in Table 5-1 and Section 7.3.1 of the datasheet.

Is TPS3824-50DBVR pin-compatible with other members of the TPS382x family?

TPS3824-50DBVR shares the same 5-pin SOT-23 (DBV) package and pinout as TPS3823-50DBVR and TPS3825-50DBVR, with identical pin assignments: pin 1=RESET, pin 2=GND, pin 3=RESET, pin 4=MR, pin 5=VDD. However, TPS3828 variants differ with open-drain output and relocated WDI pin - always verify against the specific device's Figure 5-x diagrams in the datasheet.