Texas Instruments TPS389015DSET

Overview

TPS389015DSET from Texas Instruments is a precision voltage supervisor IC designed to monitor 1.5 V system rails and assert an open-drain RESET signal upon undervoltage detection. It delivers 1% threshold accuracy (VITN = 1.44 V), programmable delay from 40 μs to 30 s via external capacitor, and ultra-low 2.1 μA quiescent current - enabling reliable power-on reset in battery-powered microcontroller systems.

For engineers reviewing the TPS389015DSET datasheet, TPS389015DSET pinout, TPS389015DSET application, or TPS389015DSET equivalent, this device serves as a low-power, high-accuracy reset supervisor for space-constrained embedded designs requiring stable rail monitoring across –40°C to +125°C.

Technical Context

The TPS389015DSET implements a precision bandgap reference and comparator with built-in hysteresis (0.325–0.825%) to ensure clean, noise-immune RESET assertion/deassertion. Its SENSE input monitors voltages up to 5.5 V independently of VDD (1.5–5.5 V), while the CT pin uses a 1.15 µA precision current source charging a capacitor to set delay time per t_PD(r) = C_CT × 1.07 + 25 µs.

Manual Reset (MR) provides asynchronous reset initiation with 100 ns glitch immunity; RESET output is open-drain, supporting pull-up to any rail ≤5.5 V regardless of VDD. The device enters undefined state below VPOR (0.8 V) and asserts RESET during UVLO (VPOR < VDD < 1.5 V).

Key Specifications

Pinout & Package

TPS389015DSET is housed in a 1.5-mm × 1.5-mm, 6-pin WSON (DSE) package with wettable flanks, optimized for automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS389012DSET, the TPS389015DSET provides exact 1.5 V rail compatibility without external components; versus MAX6315US15D3+T, it delivers 74% lower quiescent current and field-configurable delay - essential for adaptive power management in modern embedded systems.

Availability

TPS389015DSET is available at Aetrix Electronics and suitable for microcontroller power sequencing, FPGA configuration monitoring, battery-powered edge nodes, and industrial PLC power management requiring stable component supply across extended temperature ranges.

Supply support for TPS389015DSET 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TPS3890 family was engineered specifically for ultra-low-power, high-accuracy voltage supervision in space- and energy-constrained applications - targeting battery-operated IoT sensors, automotive ADAS modules, and industrial edge controllers.

FAQ

What is the exact threshold voltage specification for TPS389015DSET?

The TPS389015DSET has a nominal negative threshold voltage (VITN) of 1.44 V with ±1% accuracy over –40°C to +125°C. This corresponds to a guaranteed range of 1.4256 V to 1.4544 V at TJ = 25°C, tightening to ±0.5% typical. The positive threshold (VITP) is 1.449 V, yielding 0.575% hysteresis. These values are factory-trimmed and verified per TI's production test flow - no external calibration is needed for TPS389015DSET.

How do I calculate the CT capacitor value for a specific reset delay using TPS389015DSET?

Use the formula t_PD(r) = C_CT × 1.07 + 25 µs, where t_PD(r) is the desired rising-edge reset delay in seconds and C_CT is capacitance in farads. For example, a 100 ms delay requires C_CT = (0.1 – 25×10^–6) / 1.07 ≈ 93.4 nF. Select a 100 nF X7R ceramic capacitor with ≤20% tolerance and place it within 2 mm of the CT pin with short, low-inductance traces to minimize leakage error in TPS389015DSET.

Can TPS389015DSET monitor a 3.3 V rail while powered from 1.5 V?

Yes. The SENSE input of TPS389015DSET accepts 0 V to 5.5 V independent of VDD, so it can directly monitor a 3.3 V rail while VDD = 1.5 V. However, the fixed 1.44 V threshold applies only to the SENSE pin voltage - to supervise 3.3 V, you must use the adjustable TPS389001 variant with an external resistor divider. The TPS389015DSET itself is strictly for 1.5 V rail monitoring; attempting to use it for 3.3 V would cause immediate, permanent assertion of RESET.

What is the maximum allowable pullup resistance on the RESET pin of TPS389015DSET?

The RESET pin of TPS389015DSET supports pullup resistors from 10 kΩ to 1 MΩ per TI's recommended operating conditions. At 1 MΩ, the worst-case VOL remains ≤0.25 V with I_RESET = 0.4 mA and VDD ≥1.5 V. Higher values increase rise time and susceptibility to noise; values below 10 kΩ raise quiescent current unnecessarily. For 3.3 V logic interfaces, a 47 kΩ pullup balances speed, noise immunity, and power - confirmed in TPS389015DSET characterization data.

Does TPS389015DSET require a decoupling capacitor on the VDD pin?

Yes. A 0.1 µF ceramic capacitor must be placed as close as possible to the VDD pin of TPS389015DSET, per TI's layout guidelines. This stabilizes the internal reference and comparator during transient load events on the monitored rail. Without it, the device may exhibit erratic RESET assertion due to supply bounce - especially during MR-triggered resets or rapid SENSE voltage transitions. The capacitor must be X7R or better, with low ESR, and connected directly to the VDD and GND pins using short, wide traces.