Texas Instruments TPS389020DSER

Overview

TPS389020DSER from Texas Instruments is a precision voltage supervisor IC that monitors 2.0 V system rails with ±1% threshold accuracy, asserts an open-drain RESET signal on undervoltage or manual reset, and supports user-programmable delay from 40 μs to 30 s via external capacitor on CT pin-used in microcontroller power sequencing for industrial control and battery-powered edge devices.

For engineers reviewing the TPS389020DSER datasheet, TPS389020DSER pinout, TPS389020DSER application, or TPS389020DSER equivalent, key selection criteria include its 2.1 μA quiescent current, –40°C to +125°C operating range, 1.5-mm × 1.5-mm WSON-6 package, and fixed 1.90 V negative threshold (VITN) with 0.575% hysteresis-critical for reliable POR in space-constrained embedded systems.

Technical Context

The TPS389020DSER implements a precision bandgap reference and comparator-based supervision architecture with built-in hysteresis, enabling stable reset assertion/deassertion even under marginal rail conditions. Its CT pin uses a 1.15 µA internal current source charging an external capacitor to generate programmable delay, while SENSE input accepts up to 5.5 V independent of VDD.

It operates across 1.5 V to 5.5 V supply range and features MR input with 100 ns glitch immunity, open-drain RESET output compatible with pull-up voltages up to 5.5 V, and low-leakage SENSE input (<100 nA at 5 V), supporting accurate monitoring of low-voltage rails without loading sensitive power domains.

Key Specifications

Pinout & Package

TPS389020DSER is housed in a 1.5-mm × 1.5-mm, 6-pin WSON package with wettable flanks, optimized for automated optical inspection and thermal performance in compact designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS389020DSER, TPS389018DSER offers identical functionality for 1.8 V rails but cannot replace it on 2.0 V without redesign, while MAX6326UT20+T sacrifices programmability and MR flexibility for lower cost and simpler integration in non-critical applications.

Availability

TPS389020DSER is available at Aetrix Electronics and suitable for industrial motor control, edge AI sensor nodes, automotive body controllers, and medical wearable chargers requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS389020DSER 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 high-reliability ICs.

The TPS3890 family was designed specifically for precision, low-power voltage supervision in space-constrained and battery-sensitive applications-from industrial PLCs to portable medical devices-emphasizing accuracy, configurability, and wide temperature operation.

FAQ

What is the exact negative threshold voltage (VITN) of the TPS389020DSER?

The TPS389020DSER has a nominal negative threshold voltage (VITN) of 1.90 V with ±1% accuracy over –40°C to +125°C. This value is factory-trimmed and specified in the Device Comparison Table of the SLVSD65A datasheet. It is distinct from other variants like TPS389018 (1.73 V) or TPS389025 (2.40 V), and applies exclusively to the TPS389020DSER part number.

Does the TPS389020DSER require an external pull-up resistor on the RESET pin?

Yes, the TPS389020DSER features an open-drain RESET output and requires an external pull-up resistor-typically between 10 kΩ and 1 MΩ-to the desired logic-high voltage (up to 5.5 V). The resistor value must be selected based on load capacitance and leakage current to ensure VOL remains ≤0.25 V at 0.4 mA sink, as specified in the Electrical Characteristics table for the TPS389020DSER.

Can the TPS389020DSER monitor a voltage rail higher than its VDD supply?

Yes, the TPS389020DSER SENSE input accepts voltages from 0 V to 5.5 V regardless of VDD level (1.5 V to 5.5 V). For example, the TPS389020DSER can supervise a 3.3 V I/O rail while powered from a separate 1.8 V supply-enabling flexible power domain isolation without level-shifting components.

What is the minimum CT capacitor value needed to achieve a 1 ms reset delay with the TPS389020DSER?

Using the worst-case parameters (ICT = 1.35 µA max, VCT = 1.17 V min), the TPS389020DSER requires ≥1.149 nF on the CT pin for a guaranteed 1 ms delay. With ±20% ceramic capacitor tolerance, a 1.5 nF or larger capacitor ensures compliance-verified in TI's application note for Delfino MCU power sequencing using the TPS389020DSER.

Is the TPS389020DSER pin-compatible with other members of the TPS3890 family?

Yes, all TPS3890 variants-including TPS389020DSER, TPS389018DSER, and TPS389025DSER-share identical WSON-6 (DSE) pinout and package dimensions (1.5 mm × 1.5 mm). This allows direct substitution within the same family when threshold voltage and application timing align, simplifying BOM rationalization across multiple rail voltages.