Texas Instruments TPS3850H50DRCT

Overview

TPS3850H50DRCT from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for high-reliability power-rail monitoring in microcontroller and SoC systems. It delivers 0.8% threshold accuracy over –40°C to +125°C, supports 1.6 V–6.5 V supply range, features open-drain RESET and WDO outputs, and enables ±4% or ±7% fault windows on rails from 0.9 V to 5.0 V - used in ultrasound scanners and active antenna systems.

For engineers reviewing the TPS3850H50DRCT datasheet, TPS3850H50DRCT pinout, TPS3850H50DRCT application, or TPS3850H50DRCT equivalent, key selection criteria include factory-programmed vs capacitor-programmable reset/watchdog timing, SENSE pin hysteresis (0.5%), watchdog disable capability via SET pins, and compatibility with tight-tolerance 1.2 V/1.8 V/3.3 V/5.0 V rails in industrial and medical embedded systems.

Technical Context

The TPS3850H50DRCT implements dual independent timing paths: one for RESET delay (programmable via CRST pin using capacitor or 10-kΩ pullup) and another for window watchdog boundaries (tWDL/tWDU), both derived from an internal precision clock. Its window comparator uses matched reference circuitry to achieve 0.8% VIT+(OV) and VIT–(UV) accuracy across temperature, with 0.5% hysteresis ensuring immunity to rail noise and glitches.

Watchdog operation is configurable via SET0/SET1 logic inputs and CWD pin state (capacitor, 10-kΩ pullup, or NC), enabling eight distinct watchdog ratios including 1:8, 3:4, and 1:2 - with dedicated WDO output asserting only when RESET is high, supporting fault isolation in safety-critical firmware recovery sequences.

Key Specifications

Pinout & Package

TPS3850H50DRCT is housed in a 3.00-mm × 3.00-mm, 10-pin VSON package (DRC) with exposed thermal pad connected internally to GND. The package supports high-density PCB layouts and efficient heat dissipation in thermally constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3850H50DRCT, TPS3851H50DRCT adds power-switching functionality at the expense of higher quiescent current (15 µA vs 10 µA), while MAX6373KA29+T sacrifices programmability and accuracy for lower unit cost and simpler integration in fixed-threshold use cases.

Availability

TPS3850H50DRCT is available at Aetrix Electronics and suitable for ultrasound scanners, active antenna systems, robot servo drives, and infusion pumps requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3850H50DRCT 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 and embedded processing technologies, with decades of expertise in precision power management and reliability-critical IC design.

The TPS3850 family was developed to address the growing demand for high-accuracy, multi-function supervisory ICs in medical imaging, 5G infrastructure, and industrial automation - combining voltage monitoring, watchdog timing, and robust ESD protection in a miniature VSON package.

FAQ

What is the operating temperature range for the TPS3850H50DRCT?

The TPS3850H50DRCT operates across a junction temperature range of –40°C to +125°C, validated per JEDEC JESD22-A108. This range supports deployment in under-hood automotive modules, base station RF units, and portable medical devices where ambient temperatures exceed 85°C. All electrical specifications, including 0.8% threshold accuracy and 10 µA supply current, are guaranteed across this full range.

How does the TPS3850H50DRCT implement window watchdog functionality?

The TPS3850H50DRCT implements window watchdog functionality through independent lower (tWDL) and upper (tWDU) time boundaries, both programmable via CWD pin configuration and SET0/SET1 logic states. A falling edge on WDI must occur between these boundaries to prevent WDO assertion. The TPS3850H50DRCT supports ratios of 1:8, 3:4, and 1:2, with factory-programmed or capacitor-set timing values - enabling precise alignment with firmware execution windows.

Can the TPS3850H50DRCT monitor multiple voltage rails simultaneously?

No, the TPS3850H50DRCT has a single SENSE input and is designed to supervise one voltage rail per device. To monitor multiple rails (e.g., 1.2 V core and 3.3 V I/O), separate TPS3850H50DRCT units are required - each configured with appropriate threshold settings via external resistor dividers on the SENSE pin. The device does not support rail multiplexing or internal voltage scaling.

What is the purpose of the CRST and CWD pins on the TPS3850H50DRCT?

The CRST pin programs the RESET delay timeout (tRST) using either a capacitor (703 µs–3.22 s) or 10-kΩ pullup resistor (8.5–11.5 ms), while the CWD pin programs the watchdog upper boundary (tWDU) using the same methods. Both pins are evaluated by an internal state machine every time the SENSE voltage re-enters the valid window, allowing dynamic timing reconfiguration during system operation - a feature unique to the TPS3850H50DRCT among TI's supervisor portfolio.

Does the TPS3850H50DRCT support disabling the watchdog timer?

Yes, the TPS3850H50DRCT supports watchdog disable via specific logic states on SET0 and SET1 pins - for example, SET0 = high and SET1 = low disables the watchdog function entirely. When disabled, the WDI input is ignored, and WDO remains in high-impedance state regardless of WDI activity. This capability is documented in Section 6.6 of the datasheet and enables safe firmware development without unintended resets.