Texas Instruments TPS3110E09DBVR

Overview

TPS3110E09DBVR from Texas Instruments is an ultralow-supply-current voltage supervisor IC with integrated watchdog timer, designed for power-on reset and runtime supervision of microprocessors operating at 0.9V nominal supply. It features a fixed 0.86V VDD threshold (±0.75% accuracy), 1.2μA typical supply current, 130ms reset delay, push-pull active-low RESET output, and WDI input for watchdog timeout detection up to 1.65s. Used in battery-powered DSP systems requiring reliable brownout and software fault recovery.

For engineers reviewing the TPS3110E09DBVR datasheet, TPS3110E09DBVR pinout, TPS3110E09DBVR application, or TPS3110E09DBVR equivalent, key selection criteria include its 0.86V trip point, –40°C to 125°C operation, SOT-23-6 package, watchdog timeout programmability via WDI edge timing, and compatibility with sub-1V logic monitoring in portable embedded systems.

Technical Context

The TPS3110E09DBVR implements a precision bandgap-based voltage reference and comparator architecture to monitor VDD against a factory-trimmed 0.86V threshold. Its internal 130ms power-on reset timer initiates only after VDD exceeds VIT– + VHYS (≥0.88V), ensuring stable assertion before system initialization. The watchdog circuit resets on missing edges at WDI-either rising or falling-with timeout configurable between 0.55s and 1.65s depending on VDD level.

RESET is a push-pull output capable of sinking 5mA and sourcing 3mA, eliminating external pull-up requirements. The SENSE input monitors auxiliary voltages down to 0.551V with 15mV hysteresis and OR-combines with VDD and MR logic to drive the same RESET output, enabling dual-rail supervision without additional logic.

Key Specifications

Pinout & Package

TPS3110E09DBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3110E09DBVR, TPS3110E12DBVR shifts the supervision threshold upward for improved noise immunity on 1.2V rails, while TPS3823-09DBVR removes watchdog complexity and increases quiescent current-making it suitable only for simpler, static reset applications without runtime fault detection.

Availability

TPS3110E09DBVR is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered telematics, industrial edge controllers, and low-power wireless gateways requiring stable component supply across extended production lifecycles.

Supply support for TPS3110E09DBVR 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 company delivering analog and embedded processing solutions, with leadership in power management, signal chain, and microcontroller technologies.

The TPS31xx family was engineered specifically for ultra-low-power voltage supervision in battery-critical and thermally demanding embedded systems, combining precision thresholds, nanoscale leakage control, and integrated watchdog functionality in minimal footprint packages.

FAQ

What is the exact VDD trip voltage of the TPS3110E09DBVR and how stable is it over temperature?

The TPS3110E09DBVR has a nominal VDD trip voltage of 0.86V with ±0.75% accuracy at 25°C. Over the full –40°C to 125°C range, the trip voltage varies from 0.817V to 0.903V (±5% total deviation), with a temperature coefficient of –0.019%/K. This stability is achieved through laser-trimmed internal resistors and a curvature-corrected bandgap reference, ensuring reliable operation in automotive and industrial environments where the TPS3110E09DBVR is commonly deployed.

Does the TPS3110E09DBVR require an external pull-up resistor on the RESET pin?

No, the TPS3110E09DBVR does not require an external pull-up resistor on the RESET pin because it features a push-pull output stage. The RESET pin actively drives high and low, eliminating the need for external biasing. This reduces BOM count and PCB area-key advantages in space-constrained designs using the TPS3110E09DBVR-while maintaining full 3.3V/1.8V logic compatibility across its operating voltage range.

How does the watchdog timer in the TPS3110E09DBVR function, and what are its timing limits?

The watchdog timer in the TPS3110E09DBVR triggers RESET if no edge (rising or falling) is detected on the WDI pin within a timeout window ranging from 0.55s to 1.65s, depending on VDD level. At VDD ≥ 0.85V, the nominal timeout is 1.1s. The timer resets on each WDI transition, enabling flexible firmware polling intervals. This behavior is fully specified in the TPS3110E09DBVR datasheet and requires no configuration registers or external components.

Can the TPS3110E09DBVR monitor two different supply rails simultaneously?

Yes, the TPS3110E09DBVR can monitor two supply rails simultaneously: VDD (primary rail, 0.86V threshold) and an auxiliary rail via the SENSE pin (0.551V threshold). Using an external resistor divider on SENSE, designers can scale higher voltages (e.g., 3.3V or 5V) down to the 0.551V reference. Both inputs feed into OR-combined logic driving the single RESET output, allowing coordinated reset assertion if either rail fails-making the TPS3110E09DBVR ideal for multi-rail embedded systems.

What is the minimum VDD required for the TPS3110E09DBVR to operate correctly with SENSE and WDI functions enabled?

The TPS3110E09DBVR requires VDD ≥ 0.8V for proper operation of the SENSE and WDI functions, as specified in the Recommended Operating Conditions table. Below 0.8V, the internal reference for SENSE (0.551V) and WDI edge detection circuitry may become unstable. The device remains functional for VDD monitoring down to 0.4V (RESET asserted), but full feature operation-including watchdog timing and auxiliary rail supervision-requires VDD ≥ 0.8V. This constraint is explicitly documented for the TPS3110E09DBVR and applies across its full temperature range.