Texas Instruments TPS389018DSET

Overview

TPS389018DSET from Texas Instruments is a precision voltage supervisor IC designed to monitor 1.8 V power rails in microcontroller and processor systems. It features 1% threshold accuracy (V_ITN = 1.73 V), programmable reset delay (40 μs to 30 s via external capacitor), open-drain RESET output, and ultra-low quiescent current of 2.1 μA - enabling reliable power-on reset and brownout detection in battery-powered embedded applications.

For engineers reviewing the TPS389018DSET datasheet, TPS389018DSET pinout, TPS389018DSET application, or TPS389018DSET equivalent, key selection criteria include its fixed 1.8 V monitoring threshold, –40°C to +125°C operating range, WSON-6 package compatibility, and support for manual reset assertion and glitch-immune SENSE input handling.

Technical Context

The TPS389018DSET implements a precision bandgap reference and comparator with built-in hysteresis (0.325–0.825%) to ensure stable RESET assertion/deassertion during rail transitions. Its CT pin uses a 1.15 µA precision charging current and 1.23 V comparator threshold to set delay time via external capacitor, enabling accurate timing across temperature.

Operation relies on dual thresholds: V_ITN = 1.73 V (negative) and V_ITP = 1.740 V (positive), delivering 1% accuracy over –40°C to +125°C. The open-drain RESET output supports pull-up to any rail ≤5.5 V independent of V_DD, while MR input allows system-level reset initiation without affecting monitored supply integrity.

Key Specifications

Pinout & Package

TPS389018DSET is housed in a 1.5-mm × 1.5-mm WSON-6 package with wettable flanks, optimized for space-constrained PCB layouts and automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS389018DSET, TPS389015DSET shifts threshold downward by 0.23 V and cannot monitor 1.8 V rails accurately, while MAX6326UT18+T sacrifices 82% quiescent current savings and thermal range - making TPS389018DSET optimal for precision, low-power, high-temp 1.8 V supervision.

Availability

TPS389018DSET is available at Aetrix Electronics and suitable for microcontroller power sequencing, FPGA configuration monitoring, industrial sensor node reset, and automotive body control module applications requiring stable component supply across extended temperature ranges.

Supply support for TPS389018DSET 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, embedded processing, and power management technologies, with decades of expertise in high-reliability supervisory circuits.

The TPS3890 family was engineered specifically for low-power, high-accuracy voltage monitoring in space- and energy-constrained systems - targeting microcontroller, FPGA, and processor-based applications demanding precise reset timing and extended temperature operation.

FAQ

What is the exact threshold voltage specification for TPS389018DSET?

The TPS389018DSET has a factory-set negative threshold voltage (V_ITN) of 1.73 V and positive threshold voltage (V_ITP) of 1.740 V, with maximum ±1% accuracy across –40°C to +125°C. This tight tolerance ensures deterministic reset behavior for 1.8 V rails without design margin overhead. The TPS389018DSET datasheet specifies these values in Section 7.5 Electrical Characteristics under V_ITN/V_ITP accuracy test conditions.

How do I calculate the CT capacitor value needed for a specific reset delay with TPS389018DSET?

Use the formula t_PD(r) (sec) = C_CT (µF) × 1.07 + 25 µs (nominal), derived from the TPS389018DSET's 1.15 µA CT charging current and 1.23 V comparator threshold. For example, a 1.5 nF capacitor yields ~1.03 ms delay. Always select low-leakage ceramic capacitors and verify worst-case timing at temperature extremes using ICT(max) and VCT(min) per Section 8.3.1. The TPS389018DSET design procedure in Figure 25 confirms this method.

Can TPS389018DSET monitor voltages other than 1.8 V?

No - the TPS389018DSET is a fixed-threshold device calibrated exclusively for 1.8 V rails (V_ITN = 1.73 V). To monitor other voltages, use the adjustable TPS389001DSET with external resistor divider, or select another fixed variant (e.g., TPS389025DSET for 2.5 V). Attempting to repurpose TPS389018DSET for non-1.8 V rails violates its specified operating conditions and invalidates accuracy guarantees.

What is the recommended pullup resistor value for the RESET pin of TPS389018DSET?

Texas Instruments recommends a RESET pullup resistor between 10 kΩ and 1 MΩ, with 1 MΩ used in the TPS389018DSET typical application (Figure 25) to minimize current draw during asserted state. Selection depends on rise time requirements and bus capacitance: lower values improve speed but increase static current. The TPS389018DSET datasheet specifies R_PU = 1–1000 kΩ in Section 7.3 Recommended Operating Conditions.

Does TPS389018DSET support operation below 1.5 V supply voltage?

No - the absolute minimum V_DD for TPS389018DSET is 1.5 V per Section 7.3 Recommended Operating Conditions. Below this, the internal reference and comparator cannot maintain specified threshold accuracy or timing performance. The device enters undefined behavior below V_POR = 0.8 V, and RESET output becomes unreliable. Always ensure V_DD remains ≥1.5 V during normal operation of TPS389018DSET.