Texas Instruments TPS3110E09DBVT

Overview

TPS3110E09DBVT 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 supply. It features a fixed 0.86V VDD threshold (±0.75% accuracy), 1.2μA typical supply current, 130ms power-on reset delay, push-pull active-low RESET output, and WDI watchdog input-enabling reliable system initialization and fault detection in battery-powered DSPs and microcontrollers.

For engineers reviewing the TPS3110E09DBVT datasheet, TPS3110E09DBVT pinout, TPS3110E09DBVT application, or TPS3110E09DBVT equivalent, key selection criteria include its 0.86V trip point, –40°C to 125°C operation, SOT-23-6 package, watchdog timeout of 1.1s (typ), and ability to assert RESET down to VDD = 0.4V-critical for ultra-low-voltage embedded systems requiring deterministic reset behavior and fail-safe monitoring.

Technical Context

The TPS3110E09DBVT implements a precision bandgap-based voltage reference and comparator architecture to monitor VDD against a factory-trimmed 0.86V threshold with 0.75% accuracy over temperature. Its internal reset timer initiates only after VDD exceeds VIT– + VHYS (≥0.88V), ensuring stable assertion before release.

Watchdog functionality relies on edge-triggered WDI input: any rising or falling edge resets the 1.1s (typ) timeout counter; failure to refresh within this window forces active-low RESET assertion. The push-pull output drives loads directly without external pull-up, supporting 3mA sink capability at VOL ≤ 0.3V.

Key Specifications

Pinout & Package

TPS3110E09DBVT is housed in a 6-pin SOT-23 (DBV) package, 2.90 mm × 2.80 mm footprint, optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3110E09DBVT, TPS3110E12DBVT offers identical watchdog and SENSE capability but targets 1.2V systems, while MAX6315US29D3+T provides basic reset at higher voltage without runtime supervision-making TPS3110E09DBVT uniquely suited for ultra-low-voltage, safety-critical embedded designs requiring both precision thresholding and firmware liveness assurance.

Availability

TPS3110E09DBVT is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC controllers, wireless edge nodes, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for TPS3110E09DBVT 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 and embedded processing solutions, with decades of expertise in power management and precision analog ICs.

The TPS31xx family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in battery-constrained and thermally demanding embedded systems-emphasizing sub-1μA operation, wide temperature resilience, and integrated watchdog reliability.

FAQ

What is the exact VDD threshold voltage of the TPS3110E09DBVT and how accurate is it?

The TPS3110E09DBVT has a nominal VDD threshold voltage (VIT–) of 0.86 V, with a guaranteed accuracy of ±0.75% over temperature (–40°C to 125°C). At 25°C, the specification is 0.854 V (min) to 0.866 V (max); across the full temperature range, it remains within 0.817 V to 0.903 V. This precision enables reliable supervision of 0.9V supply rails without external calibration. The TPS3110E09DBVT achieves this via factory-trimmed internal voltage dividers and bandgap references.

Does the TPS3110E09DBVT require an external pull-up resistor on the RESET pin?

No, the TPS3110E09DBVT does not require an external pull-up resistor on the RESET pin because it features an active-low push-pull output stage. Unlike open-drain supervisors, the TPS3110E09DBVT actively drives RESET high (up to 0.8×VDD) and low (≤0.3V at 3mA), eliminating dependency on external components. This simplifies design, reduces BOM count, and improves noise immunity in electrically noisy environments-key advantages confirmed in the TPS3110E09DBVT electrical characteristics table.

How does the watchdog timer in the TPS3110E09DBVT operate, and what is its timeout period?

The TPS3110E09DBVT watchdog timer is edge-triggered: any rising or falling transition on the WDI pin resets the timeout counter. If no edge occurs within the timeout window, RESET is asserted for the standard 130ms delay. The typical timeout period is 1.1 seconds, with a min/max range of 0.55 s to 1.65 s (at VDD ≥ 0.85V). This behavior is explicitly defined in the TPS3110E09DBVT timing requirements section and enables robust firmware liveness checking without precise timing constraints.

Can the TPS3110E09DBVT monitor a second voltage rail, and if so, how?

Yes, the TPS3110E09DBVT can monitor a second voltage rail using its dedicated SENSE pin, which compares the applied voltage to an internal 0.551V reference. To supervise voltages above 0.551V (e.g., 3.3V, 5V), a resistor divider scales the rail down to match the reference. The resulting logic signal is OR-wired with VDD and MR status, meaning either rail fault triggers RESET. This dual-rail capability is documented in the TPS3110E09DBVT functional block diagram and SENSE feature description.

What is the minimum supply voltage at which the TPS3110E09DBVT can assert RESET, and why is this important?

The TPS3110E09DBVT can assert RESET down to a minimum VDD of 0.4V, as specified in the absolute maximum ratings and functional description. This capability ensures reliable reset generation even during deep brown-out or battery depletion scenarios where other supervisors may lose functionality. For applications like energy-harvesting nodes or coin-cell devices, this 0.4V operation margin is critical to guarantee system shutdown before data corruption or undefined MCU states occur-directly supported by TPS3110E09DBVT's internal architecture and test conditions.