Texas Instruments TPS3780CDBVR

Overview

TPS3780CDBVR from Texas Instruments is a dual-channel, open-drain voltage detector IC designed for precision rail monitoring in low-power systems. It features 10% factory-set hysteresis, ±1% VIT+ threshold accuracy over –40°C to 125°C, and 2 µA typical quiescent current. The device monitors two independent supply rails (e.g., 3.3 V and 3.0 V) and asserts open-drain outputs to reset or enable inputs of microcontrollers, FPGAs, or LDOs.

For engineers reviewing the TPS3780CDBVR datasheet, TPS3780CDBVR pinout, TPS3780CDBVR application, or TPS3780CDBVR equivalent, key selection criteria include its 10% hysteresis option, open-drain output compatibility with 6.5 V pull-up rails independent of VDD, adjustable detection down to 1.2 V via external resistor dividers, and operation across 1.5 V–6.5 V supply range.

Technical Context

The TPS3780CDBVR implements two independent high-accuracy comparators with internal reference trimming-VIT+ = 1.074 V (±1%) and VIT– = VIT+ × (1 − 0.10) - enabling precise undervoltage detection with noise immunity. Its open-drain outputs support level-shifting: OUT1/OUT2 can be pulled up to 6.5 V regardless of VDD (1.5 V–6.5 V), allowing interface with higher-voltage logic domains.

Startup delay is fixed at 570 µs after VDD crosses VDD(min); propagation delays are 5.5 µs (rising) and 10 µs (falling). Input bias current is ±15 nA, enabling high-impedance resistor dividers (e.g., >1 MΩ total) without significant error-critical for battery-powered applications requiring minimal loading.

Key Specifications

Pinout & Package

SOT23-6 package (2.92 mm × 1.30 mm), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel voltage detector applications.

Compared with TPS3780DDBVR and MAX6315US29D3+, the TPS3780CDBVR uniquely delivers 10% hysteresis in an open-drain dual-channel configuration - essential for noisy industrial rails and mixed-voltage reset arbitration - while maintaining 2 µA quiescent current and 1.5–6.5 V operation.

Availability

TPS3780CDBVR is available at Aetrix Electronics and suitable for power-supply sequencing, portable medical devices, building automation sensors, and solid-state drives requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3780CDBVR 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 specializing in analog and embedded processing technologies, with leadership in precision analog ICs and power management solutions.

The TPS37xx family was designed specifically for high-accuracy, low-quiescent-current dual-rail monitoring in space-constrained, battery-sensitive, and thermally demanding applications - including automotive, industrial, and computing systems.

FAQ

What is the exact VIT+ threshold voltage for TPS3780CDBVR and how is it trimmed?

The TPS3780CDBVR has a factory-trimmed positive-going input threshold (VIT+) of 1.074 V ±1% over –40°C to 125°C. This value corresponds to the 10% hysteresis variant (TPS3780C) and is laser-trimmed during production to ensure accuracy without external calibration. The TPS3780CDBVR datasheet specifies VIT+ = 1.074 V (typical) with deviation bounded by ±1% across temperature and supply voltage.

Can TPS3780CDBVR monitor a 1.2 V rail directly, or does it require a resistor divider?

The TPS3780CDBVR cannot monitor a 1.2 V rail directly at its SENSE pins because its minimum VIT+ is 1.074 V - too close to cause reliable margin. However, it supports adjustable detection down to 1.2 V *via external resistor dividers*: applying a voltage divider to scale a higher rail (e.g., 3.3 V) down to match the 1.074 V threshold enables precise 1.2 V monitoring. The TPS3780CDBVR's ±15 nA input bias current ensures minimal divider error.

What is the maximum allowable pull-up voltage on OUT1 and OUT2 of TPS3780CDBVR?

The maximum allowable pull-up voltage on OUT1 and OUT2 of TPS3780CDBVR is 6.5 V, as specified in the Absolute Maximum Ratings table. This is independent of VDD - meaning OUT1/OUT2 can be pulled up to 5 V or 3.3 V logic rails even when VDD = 1.8 V. Exceeding 6.5 V risks permanent damage; the 7 V absolute max on SENSE pins does not apply to the open-drain outputs.

How does the 570 µs startup delay of TPS3780CDBVR affect system reset timing?

TPS3780CDBVR asserts valid output states only 570 µs after VDD rises above VDD(min) (~1.5 V). During this startup delay, outputs remain undefined - so downstream devices must tolerate indeterminate reset states. This delay ensures internal references stabilize before decision-making. For systems requiring faster reset assertion, designers must account for this fixed latency in power-on sequencing budgets or add external POR circuitry.

Is TPS3780CDBVR compatible with I²C or other digital interfaces?

No, TPS3780CDBVR is not compatible with I²C or any digital communication interface. It is a dedicated analog voltage detector IC with two comparator inputs (SENSE1/SENSE2) and two open-drain digital outputs (OUT1/OUT2). It lacks address pins, serial interface logic, or programmable registers. Its function is strictly threshold-based monitoring - not bus communication - and it operates autonomously without firmware interaction.