Texas Instruments TPS3823-33DBVR

Overview

TPS3823-33DBVR from Texas Instruments is a 3.3V supply voltage supervisor IC with integrated watchdog timer, active-low push-pull reset output, manual reset input, and 200ms reset delay. It monitors VDD ≥ 1.1V power-up, asserts RESET low when VDD falls below 2.93V (typ), and provides system-level fault recovery for microcontrollers in embedded control systems.

For engineers reviewing the TPS3823-33DBVR datasheet, TPS3823-33DBVR pinout, TPS3823-33DBVR application, or TPS3823-33DBVR equivalent, key selection criteria include its fixed 3.3V threshold (±2.5% over −40°C to 85°C), 1.6s watchdog timeout, 15μA quiescent current, SOT-23-5 package compatibility, and MR/WDI interface timing requirements.

Technical Context

The TPS3823-33DBVR implements a precision bandgap-based voltage reference with internal resistor divider to set V_IT− = 2.93V (nominal) and hysteresis of 50mV. Its watchdog timer requires periodic falling-edge transitions on WDI to prevent timeout; absence triggers a 200ms active-low RESET pulse. The device uses an internal oscillator and transition detector to manage reset assertion and release timing without external components.

Reset assertion occurs at VDD < 2.93V; release is delayed until VDD rises above 2.93V + 50mV and remains stable for 200ms. Manual reset (MR) overrides voltage monitoring and forces RESET low independently of VDD level or watchdog state. All logic inputs (MR, WDI) are CMOS-compatible with rail-to-rail thresholds.

Key Specifications

Pinout & Package

TPS3823-33DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90mm × 1.60mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3823A-33DBVR, the original TPS3823-33DBVR offers identical supervision accuracy and watchdog behavior but limits ambient operation to 85°C; versus TPS3820-33DBVR, it trades faster reset release for autonomous hardware watchdog coverage-critical for unattended embedded deployments.

Availability

TPS3823-33DBVR is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, wireless infrastructure, and notebook platform management requiring stable component supply and long-term manufacturability.

Supply support for TPS3823-33DBVR 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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS382x product line delivers highly integrated, low-power voltage supervisors with configurable reset timing and watchdog functions specifically engineered for reliable power-on initialization and runtime fault detection in processor-based systems.

FAQ

What is the exact reset threshold voltage for TPS3823-33DBVR across temperature?

The TPS3823-33DBVR has a guaranteed negative-going input threshold voltage (V_IT−) of 2.86V (min) to 3.00V (max) over −40°C to 85°C, with 2.93V typical. This 3.3V-specific threshold ensures precise supervision of nominal 3.3V rails while accommodating manufacturing tolerance and thermal drift without external calibration. The 50mV hysteresis prevents chatter during supply ramping.

Does TPS3823-33DBVR require external components for basic operation?

No, TPS3823-33DBVR requires no external components for core supervision functionality. Its fixed 3.3V threshold is set by an internal resistor divider, and the watchdog timer operates autonomously from the WDI pin. A 0.1μF ceramic bypass capacitor on VDD is recommended for noise immunity, but not mandatory for functional operation per datasheet specifications.

How does the watchdog timer in TPS3823-33DBVR respond to a floating WDI pin?

When WDI is left floating, TPS3823-33DBVR internally generates periodic pulses to prevent watchdog timeout. This default behavior avoids unintended resets in systems where WDI is unused. To disable watchdog entirely, tie WDI to GND or VDD; to enable active monitoring, drive WDI with clean falling edges at intervals ≤1.6s. The internal pulse generation is documented in TI's SLVS165O datasheet Section 7.3.4.

Can TPS3823-33DBVR drive a microcontroller reset pin directly?

Yes, TPS3823-33DBVR features a push-pull active-low RESET output capable of sinking up to 3mA (at VOL = 0.4V) and sourcing current to VDD. It interfaces directly with standard CMOS reset inputs (e.g., ARM, MSP430, PIC) without external pull-up resistors. The 200ms delay ensures adequate hold time for processor internal state initialization before release.

What is the maximum operating temperature for TPS3823-33DBVR?

The TPS3823-33DBVR is characterized for operation from −40°C to 85°C ambient temperature. For applications requiring extended temperature range, the pin-compatible TPS3823A-33DBVR variant supports −40°C to 125°C operation while maintaining identical electrical specifications, watchdog timing, and reset threshold performance.