Texas Instruments TPS3780DDRYT

Overview

TPS3780DDRYT from Texas Instruments is a dual-channel, low-power, high-accuracy voltage detector IC with open-drain outputs, operating from 1.5 V to 6.5 V supply and supporting –40°C to 125°C ambient temperature. It features adjustable detection thresholds down to 1.2 V via external resistor dividers, 1% threshold accuracy, and factory-set 1% hysteresis (TPS3780D variant). It monitors two independent rails-e.g., core and I/O supplies-in portable medical devices and power-supply sequencing circuits.

For engineers reviewing the TPS3780DDRYT datasheet, TPS3780DDRYT pinout, TPS3780DDRYT application, or TPS3780DDRYT equivalent, key selection criteria include its open-drain output compatibility with mixed-voltage systems, ultra-low 2 µA typical quiescent current, ±1% VIT+ accuracy over temperature, and µSON-6 package for space-constrained PCB layouts.

Technical Context

The TPS3780DDRYT implements two independent comparators with internal precision reference and programmable hysteresis (1% for D-grade), enabling stable rail monitoring under noise-prone conditions. Each SENSE input accepts voltages up to 6.5 V regardless of VDD, allowing direct monitoring of higher-voltage rails without level-shifting.

Its open-drain outputs (OUT1/OUT2) support pull-up to any voltage ≤6.5 V independent of VDD, enabling interface with diverse logic families (e.g., 1.8-V, 3.3-V, or 5-V reset inputs). Startup delay is fixed at 570 µs after VDD crosses VDD(min), ensuring deterministic power-on behavior in multi-rail systems.

Key Specifications

Pinout & Package

TPS3780DDRYT is housed in a 1.45 mm × 1.00 mm, 6-pin µSON (DRY) package with wettable flanks for automated optical inspection. Thermal resistance RθJA = 306.7°C/W enables operation at full rating in compact enclosures without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3780DDRYT, TPS3780DBVR offers identical functionality in a larger, more manufacturable package, while MAX6816EUT+T sacrifices channel count, accuracy, and interface flexibility to reduce unit cost-making it viable only for single-rail, cost-sensitive consumer applications.

Availability

TPS3780DDRYT is available at Aetrix Electronics and suitable for power-supply sequencing, portable medical sensors, building automation controllers, and solid-state drives requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3780DDRYT 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 voltage supervision and low-power system monitoring ICs.

The TPS37xx family was designed specifically for space- and power-constrained applications requiring dual-rail monitoring with high accuracy and flexible output interfacing-targeting portable, industrial, and automotive subsystems.

FAQ

What is the maximum allowable voltage on the SENSE1 and SENSE2 pins of the TPS3780DDRYT?

The TPS3780DDRYT SENSE1 and SENSE2 pins tolerate voltages from –0.3 V to 7 V, independent of VDD. This allows direct monitoring of rails up to 6.5 V (e.g., 5-V USB or industrial 24-V derived supplies via resistive divider) without clamping diodes or level shifters. Exceeding 7 V risks permanent damage per absolute maximum ratings.

Does the TPS3780DDRYT require an external pull-up resistor on OUT1 and OUT2?

Yes, the TPS3780DDRYT features open-drain outputs (OUT1 and OUT2), so external pull-up resistors are mandatory to establish a defined high state. The datasheet specifies RPU between 1.5 kΩ and 10 MΩ; typical values are 10–100 kΩ depending on rise time and bus capacitance. Pull-up voltage may be up to 6.5 V, independent of VDD.

How does the 1% hysteresis of the TPS3780DDRYT improve system reliability?

The 1% hysteresis in the TPS3780DDRYT prevents output oscillation during slow-rising or noisy supply transitions. For a 3.3-V rail, this equates to a 33-mV window between VIT+ (3.333 V) and VIT– (3.299 V), rejecting transients ≤33 mV and eliminating false resets caused by switching noise or thermal droop-critical in DSP and FPGA applications.

Can the TPS3780DDRYT monitor two different voltage domains simultaneously?

Yes, the TPS3780DDRYT independently monitors SENSE1 and SENSE2 with separate thresholds and outputs. For example, SENSE1 can supervise a 1.8-V core rail (using R1/R2 divider), while SENSE2 monitors a 5-V I/O rail (using R3/R4 divider), with OUT1 and OUT2 driving respective reset inputs-enabling true dual-domain supervision in SoC-based systems.

What is the startup behavior of the TPS3780DDRYT during power-on?

Upon VDD crossing VDD(min), the TPS3780DDRYT enters a 570-µs startup delay before responding to SENSE inputs. During this period, outputs remain in high-impedance (open-drain) state. After delay completion, OUT1/OUT2 assert based on instantaneous SENSE1/SENSE2 voltage relative to VIT–/VIT+, ensuring deterministic reset timing aligned with system power stabilization.