STMicroelectronics STM6519ACARUB6F

Overview

STM6519ACARUB6F from STMicroelectronics is a single-pin, push-button Smart Reset™ supervisor IC designed for delayed reset assertion in portable electronics. It features a factory-programmed Smart Reset setup delay (tSRC) of 1.5 s (typ.), operates from 2.0 V to 5.5 V, draws only 1 µA supply current, and delivers active-low open-drain reset output (RST) without fixed tREC - meaning pulse width is fully push-button controlled. It is used in smartphones and e-readers to prevent spurious resets from brief button presses.

For engineers reviewing the STM6519ACARUB6F datasheet, STM6519ACARUB6F pinout, STM6519ACARUB6F application, or STM6519ACARUB6F equivalent, key selection criteria include its programmable tSRC delay step (0.5 s increments), absence of tREC timing guarantee, UDFN6 package footprint constraints, and compatibility with systems requiring glitch-immune, user-initiated hard reset via shared interrupt/reset button.

Technical Context

The STM6519 implements a digital timer-based Smart Reset logic that requires the SR input to be held low for ≥1.5 s (typ.) before asserting RST; no minimum reset pulse width is guaranteed, so RST de-asserts immediately upon SR release. Its internal threshold detection and test mode entry (via VSR > VCC + 1.1 V) are calibrated across –40 °C to +85 °C, with tSRC variation bounded at ±20% over temperature.

It supports dual-voltage-domain operation: SR may reside in a different voltage domain than VCC (e.g., VBAT), provided VCC powers up before or concurrently with SR to avoid inadvertent test mode activation. The device guarantees high-impedance RST output during undervoltage conditions when configured as open drain.

Key Specifications

Pinout & Package

STM6519ACARUB6F uses the UDFN6 (1.00 mm × 1.45 mm) package with wettable flanks, RoHS-compliant and halogen-free per ECOPACK®2. Pin 1 is marked by a dot; pins 5 and 6 are not bonded and must be connected to VSS.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar push-button reset supervisor applications.

Compared with MAX6326TUT+T and TPS3808G15DBVR, STM6519ACARUB6F uniquely combines factory-programmed tSRC, open-drain RST, integrated test mode with visual feedback, and zero external components - making it optimal for compact, cost-sensitive portable designs where button reuse and diagnostic capability are critical.

Availability

STM6519ACARUB6F is available at Aetrix Electronics and suitable for smartphone system reset, e-reader power management, portable GPS navigation, and Bluetooth headset recovery requiring stable component supply and consistent factory-programmed timing behavior.

Supply support for STM6519ACARUB6F 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, analog, and sensor solutions for automotive, industrial, and consumer markets.

The STM6519 belongs to ST's Smart Reset™ supervisor product line, engineered specifically to replace mechanical reset buttons with intelligent, delay-validated push-button interfaces in battery-powered portable electronics.

FAQ

Does STM6519ACARUB6F provide VCC monitoring or brown-out detection?

No. STM6519ACARUB6F lacks VCC threshold monitoring; it solely responds to the SR input signal. Its reset assertion depends entirely on the duration the SR pin is held low, not on supply voltage level. For combined VCC supervision and push-button reset, consider ST's STM63xx series with "B" or "C" suffixes indicating built-in voltage detectors.

What is the function of pins 5 and 6 on the UDFN6 package?

Pins 5 and 6 are not electrically bonded and serve no internal function. Per ST's datasheet, they must be externally connected to VSS (ground) to ensure mechanical stability, thermal dissipation, and EMI performance. Leaving them floating violates layout guidelines and may cause solder joint reliability issues or noise coupling.

Can STM6519ACARUB6F be used with SR and VCC in different voltage domains?

Yes - the SR input has fixed logic thresholds (VIL ≤ 0.3 V, VIH ≥ 0.85 × VCC), enabling use in mixed-voltage systems (e.g., SR driven from 1.8 V VBAT while VCC = 3.3 V). However, VCC must power up before or simultaneously with SR voltage to prevent inadvertent test mode entry caused by VSR > VCC + 1.1 V during startup.

Is the tREC timeout option enabled in STM6519ACARUB6F?

No. The "R" in the order code (STM6519ACARUB6F) explicitly denotes the "push-button controlled" variant - meaning RST de-asserts immediately when SR is released, with no factory-programmed tREC delay. This differs from variants ending in "A", "B", or "E", which embed fixed tREC values (e.g., 210 ms, 360 ms, or 1.28 ms).