Texas Instruments TPS3899DL01DSERQ1

Overview

TPS3899DL01DSERQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive nano-power voltage supervisor with open-drain active-low RESET output, ±0.5% threshold accuracy, 125nA typical quiescent current, and programmable sense/reset delay via external capacitors on CTS/CTR pins-used to monitor critical rails or push-button inputs in ADAS and radar ECUs.

For engineers reviewing the TPS3899DL01DSERQ1 datasheet, TPS3899DL01DSERQ1 pinout, TPS3899DL01DSERQ1 application, or TPS3899DL01DSERQ1 equivalent, key selection considerations include its 0.505V adjustable VIT− threshold, 1.5mm × 1.5mm WSON-6 (DSE) package, dual-capacitor timing control, built-in 5% hysteresis, and operation across –40°C to +125°C ambient.

Technical Context

The TPS3899DL01DSERQ1 implements a precision comparator with separate SENSE and VDD pins, enabling independent monitoring of voltage rails distinct from its supply. Its internal reference delivers ±0.5% VIT− accuracy over temperature, and built-in 5% hysteresis prevents chatter during threshold crossings.

Timing is controlled by two dedicated pins: CTS sets sense delay (assertion) via external capacitor (50µs min to ~6.2s max), while CTR sets reset delay (deassertion) with identical range; both use internal 500kΩ pull-ups and 0.73×VDD trip thresholds. Glitch immunity is specified at 10µs for 5% VIT− overdrive.

Key Specifications

Pinout & Package

Package: 1.5mm × 1.5mm WSON-6 (DSE), moisture-sensitive level 1, no lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3899PL01DSERQ1, the TPS3899DL01DSERQ1 requires an external pull-up but offers greater interface flexibility (level-shifted RESET). Compared with TLV809E25DBVRQ1, it provides adjustable threshold, nanoscale IQ, and capacitor-programmable timing-critical for modern ADAS power architecture.

Availability

TPS3899DL01DSERQ1 is available at Aetrix Electronics and suitable for Advance Driver Assistance Systems (ADAS), Radar ECU, and Automotive Gateway applications requiring stable component supply, long-term automotive lifecycle support, and AEC-Q100-compliant traceability.

Supply support for TPS3899DL01DSERQ1 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 automotive, industrial, and power management ICs.

The TPS3899-Q1 product line delivers ultra-low-power, high-accuracy voltage supervision for safety-critical automotive subsystems-including ADAS, infotainment, and electrification-where reliability, precision, and compact size are mandatory.

FAQ

What is the function of the CTS pin on the TPS3899DL01DSERQ1?

The CTS pin on the TPS3899DL01DSERQ1 sets the sense delay-the time between SENSE falling below VIT− and RESET assertion. It uses an internal 500kΩ pull-up and trips at 0.73×VDD; connecting a capacitor to ground programs delays from 50µs (open) to ~6.2s (10µF). This enables push-button debouncing and noise rejection on monitored rails.

Does the TPS3899DL01DSERQ1 require an external pull-up resistor on the RESET pin?

Yes, the TPS3899DL01DSERQ1 has an open-drain active-low RESET output and requires an external pull-up resistor to a valid logic rail (up to 6V). Typical values range from 10kΩ to 100kΩ depending on rise-time and bus loading requirements. No pull-up is needed for push-pull variants like TPS3899PL01DSERQ1.

Can the TPS3899DL01DSERQ1 monitor a voltage rail different from its VDD supply?

Yes-the TPS3899DL01DSERQ1 features independent SENSE and VDD pins. SENSE accepts 0–6V inputs regardless of VDD (0.85–6V), enabling true dual-rail monitoring (e.g., VDD = 3.3V powering the supervisor while SENSE monitors a 1.2V core rail). This supports functional safety redundancy in ASIL-B designs.

What is the minimum operating voltage for the TPS3899DL01DSERQ1?

The TPS3899DL01DSERQ1 operates down to 0.85V on both VDD and SENSE pins. Below this, the device cannot guarantee proper reset assertion or internal circuit functionality. Its VPOR (power-on reset) voltage is 700mV, ensuring defined output behavior once VDD exceeds that threshold during startup.

How does the built-in hysteresis improve system reliability in the TPS3899DL01DSERQ1?

The TPS3899DL01DSERQ1 includes 5% typical hysteresis (VHYS = 5% × VIT−), meaning RESET deasserts only when SENSE rises above VIT− + VHYS-not at the same threshold it asserted. This prevents oscillation during slow-rising/falling rails or noisy conditions, ensuring clean, single-event reset signaling critical for microcontroller boot stability.