Texas Instruments TPS3813L30DBVT

Overview

TPS3813L30DBVT from Texas Instruments is a window-watchdog supervisory IC for microcontroller and DSP systems, featuring a fixed 2.64V supply voltage threshold (VIT), 25ms power-on reset delay, 9µA typical supply current, open-drain RESET output, and programmable watchdog window ratio via WDR/WDT pins. It operates across –40°C to +85°C and is used in safety-critical embedded systems requiring dual-voltage monitoring and time-bound software execution validation.

For engineers reviewing the TPS3813L30DBVT datasheet, TPS3813L30DBVT pinout, TPS3813L30DBVT application, or TPS3813L30DBVT equivalent, key selection criteria include its precise 2.64V VIT tolerance (±30mV), configurable watchdog window (e.g., 1:31.8 to 1:127.7 ratios), SOT-23-6 package footprint, glitch immunity (3µs), and compatibility with 2V–6V supply rails in industrial and medical timing supervision.

Technical Context

The TPS3813L30DBVT integrates a precision voltage comparator with internal 2.64V reference and hysteresis (35mV), plus a dual-boundary window-watchdog timer whose upper timeout (0.25s–2.5s) is set by WDT pin state or external capacitor (155pF–63nF), and lower boundary ratio (1:25.8–1:127.7) is selected via WDR tied to GND or VDD. Its RESET output remains low until VDD exceeds 2.64V and stays asserted for 25ms after threshold crossing.

It requires no external components for basic operation: VDD powers internal bandgap, oscillator, and logic; WDI must be actively toggled within the programmed window to prevent RESET assertion; all six pins have defined I/O roles with strict floating-pin avoidance requirements on WDI, WDR, and WDT.

Key Specifications

Pinout & Package

TPS3813L30DBVT is housed in a 6-pin SOT-23 package (2.90mm × 1.60mm body size) with gull-wing leads, optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3813L30DBVT, TPS3813K33DBV offers higher threshold for 3.3V systems but identical watchdog flexibility, while MAX6326UT26D3+ trades window-watchdog capability for lower quiescent current and push-pull output - making it appropriate only for non-safety-critical reset-only use cases.

Availability

TPS3813L30DBVT is available at Aetrix Electronics and suitable for infusion pump safety monitoring, electricity meter firmware integrity, and HVAC controller fault recovery requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical and industrial certifications.

Supply support for TPS3813L30DBVT 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 focused on analog, embedded processing, and connectivity technologies, serving industrial, automotive, and communications markets with high-reliability components.

The TPS3813xxx family was designed specifically for safety-critical embedded systems needing simultaneous voltage supervision and programmable window-watchdog functionality - targeting medical, energy, and infrastructure applications demanding IEC 62304 or UL 60730 compliance.

FAQ

What is the exact supply voltage threshold (VIT) of the TPS3813L30DBVT?

The TPS3813L30DBVT has a precisely trimmed negative-going input threshold voltage (VIT) of 2.64V, with a guaranteed range of 2.58V to 2.70V across –40°C to +85°C. This value is factory-set and does not require external calibration. The TPS3813L30DBVT uses an internal voltage divider to establish this fixed threshold, making it ideal for 3.0V system supervision where margin above nominal rail is critical.

How does the window-watchdog function work on the TPS3813L30DBVT?

The TPS3813L30DBVT implements a two-boundary watchdog: the upper timeout (e.g., 0.25s or 2.5s) is set by WDT pin state or external capacitor, while the lower boundary ratio (e.g., 1:31.8 or 1:127.7) is selected via WDR tied to GND or VDD. The supervised processor must assert WDI within this window - missing either bound triggers RESET. This dual-boundary mechanism detects both early hangs and late execution, unlike standard watchdogs.

What package type and dimensions does the TPS3813L30DBVT use?

The TPS3813L30DBVT is packaged in a 6-pin SOT-23 (DBV) case with nominal body dimensions of 2.90mm × 1.60mm and standard gull-wing lead form. It is compatible with automated pick-and-place and reflow soldering per IPC/JEDEC J-STD-020. The pinout is fixed: WDI (1), GND (2), WDT (3), VDD (4), WDR (5), RESET (6). No alternate packages are offered for this variant.

Can the TPS3813L30DBVT operate from a 2.5V supply rail?

Yes, the TPS3813L30DBVT supports VDD from 2V to 6V per its Recommended Operating Conditions. However, its 2.64V VIT threshold means that at a 2.5V nominal rail, the device will assert RESET continuously since VDD never exceeds VIT. It is therefore unsuitable for 2.5V systems - use TPS3813J25DBV (2.25V VIT) instead. The TPS3813L30DBVT is intended for 3.0V systems where 2.64V provides appropriate undervoltage margin.

What is the recommended bypass capacitor for the TPS3813L30DBVT VDD pin?

A 0.1µF ceramic capacitor placed as close as possible to the VDD and GND pins is mandatory for stable operation of the TPS3813L30DBVT. This capacitor suppresses high-frequency noise, ensures clean power-up sequencing, and maintains reference stability for the internal bandgap and comparator. TI specifies X7R or better dielectric; placement within 2mm of the pins and direct connection to solid ground plane are required to meet glitch immunity and reset timing specifications.