Texas Instruments TPS3110E12DBVT

Overview

TPS3110E12DBVT from Texas Instruments is an ultralow-supply-current voltage supervisor IC with integrated watchdog timer and push-pull active-low RESET output, designed for microprocessor reset supervision. It features a fixed 1.2V VDD threshold (±0.75% accuracy), 1.2μA typical supply current, 130ms power-on reset delay, and operates from 0.9V to 3.6V supply over –40°C to 125°C. It is used in battery-powered DSP systems requiring reliable power-up sequencing and runtime fault detection.

For engineers reviewing the TPS3110E12DBVT datasheet, TPS3110E12DBVT pinout, TPS3110E12DBVT application, or TPS3110E12DBVT equivalent, key selection criteria include its 1.2V precision trip point, watchdog timeout of 1.1s (typ), push-pull output drive capability, SENSE input for auxiliary rail monitoring, and 6-pin SOT-23 package compatibility with space-constrained embedded designs.

Technical Context

The TPS3110E12DBVT implements a dual-comparator architecture: one monitors VDD against a factory-trimmed 1.2V threshold (VIT– = 1.142V typ at 25°C), while a second compares the SENSE input to a 0.551V reference. Its internal watchdog timer triggers RESET if the WDI pin fails to toggle within 1.1s (typ), providing fail-safe microprocessor supervision beyond basic power monitoring.

RESET assertion is governed by OR logic across VDD undervoltage, SENSE undervoltage, manual reset (MR) activation, and watchdog timeout events. The push-pull output delivers defined high/low states without external pull-up, supporting direct interface to microcontroller reset inputs with 0.3V VOL (IOL = 3mA, VDD = 3.3V) and 0.8×VDD VOH (IOH = –3mA).

Key Specifications

Pinout & Package

TPS3110E12DBVT is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3110E12DBVT, the TPS3110E15DBVT offers identical supervision architecture at a different threshold voltage, while the TPS3823-12DBVT trades watchdog capability and push-pull drive for lower static current-making it suitable only where runtime reliability is secondary to battery longevity.

Availability

TPS3110E12DBVT is available at Aetrix Electronics and suitable for battery-powered edge nodes, automotive body control modules, industrial PLC I/O modules, and DSP-based motor drives requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3110E12DBVT 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 power management and system supervision ICs.

The TPS31xx family was engineered specifically for low-power, high-reliability reset supervision in DSP and microcontroller systems-emphasizing precision threshold accuracy, nanoscale quiescent current, and integrated watchdog functionality for safety-critical embedded applications.

FAQ

What is the exact VDD threshold voltage of the TPS3110E12DBVT and how stable is it over temperature?

The TPS3110E12DBVT has a nominal VDD threshold of 1.2V with ±0.75% accuracy at 25°C. Over the full –40°C to 125°C operating range, the threshold varies from 1.084V to 1.199V (min/max), corresponding to a temperature coefficient of –0.019%/K. This stability is confirmed in Section 6.5 of the SLVS363H datasheet, ensuring predictable reset behavior across automotive and industrial thermal profiles without external trimming.

Does the TPS3110E12DBVT require an external pull-up resistor on its RESET pin?

No, the TPS3110E12DBVT features a push-pull RESET output, eliminating the need for an external pull-up resistor. It actively drives high (VOH ≥ 0.8×VDD at –3mA) and low (VOL ≤ 0.3V at 3mA) states, enabling direct connection to microcontroller reset inputs. This simplifies layout, reduces component count, and guarantees monotonic reset release timing-unlike open-drain alternatives such as the TPS3106 series.

How does the watchdog timer in the TPS3110E12DBVT function, and what is its timeout period?

The TPS3110E12DBVT watchdog timer resets the system if the WDI pin remains static (high or low) longer than its timeout period of 1.1s (typical), with min/max values of 0.55s and 1.65s. A rising or falling edge on WDI clears the timer. This feature is documented in Section 7.3.1 and Figure 6-4 of the datasheet, providing hardware-enforced recovery from firmware hangs without software intervention.

Can the TPS3110E12DBVT monitor a 3.3V supply rail, and if so, how?

Yes, the TPS3110E12DBVT can monitor a 3.3V rail using its SENSE input, which compares against a 0.551V internal reference. A resistor divider (e.g., R1 = 820kΩ, R2 = 430kΩ) scales the 3.3V rail to 1.2V at SENSE, triggering reset when the scaled voltage falls below 0.551V-corresponding to ~1.6V actual rail voltage. This method is validated in Figure 7-5 and Section 7.3.4 of the SLVS363H datasheet.

What is the minimum VDD required for the TPS3110E12DBVT to operate its SENSE and WDI functions?

The TPS3110E12DBVT requires VDD ≥ 0.8V to enable proper operation of the SENSE comparator and WDI watchdog input, as specified in Section 6.3 (Recommended Operating Conditions). Below 0.8V, these functions are not guaranteed-though the device continues to monitor VDD itself down to 0.4V for initial power-on reset assertion. This constraint ensures reference stability and comparator headroom for reliable auxiliary monitoring.