STMicroelectronics STM6519AUARUB6F

Overview

STM6519AUARUB6F from STMicroelectronics is a single-pin Smart Reset™ supervisory IC that implements programmable extended reset delay (tSRC = 10.0 s typ.) on an active-low push-button input (SR), delivers active-low open-drain reset output (RST), operates from 2.0 V to 5.5 V, draws only 1 µA supply current, and is housed in a 1.00 mm × 1.45 mm UDFN6 package. It enables reliable system recovery in portable consumer electronics by distinguishing short interrupts from hard resets.

For engineers reviewing the STM6519AUARUB6F datasheet, STM6519AUARUB6F pinout, STM6519AUARUB6F application, or STM6519AUARUB6F equivalent, key selection criteria include tSRC = 10.0 s factory setting, absence of tREC (push-button-controlled RST deassertion), SR input with no internal pull-up, and open-drain RST output without internal pull-up - all confirmed in the production datasheet DocID022111 Rev 7.

Technical Context

The STM6519AUARUB6F implements a precision digital timer for Smart Reset functionality: its tSRC delay is factory-programmed to 10.0 s (typ.), with ±20% variation over –40 °C to +85 °C, and uses internal logic to detect sustained SR low assertion before asserting RST. No tREC timeout is programmed, so RST remains asserted only while SR stays low.

It supports test mode entry via SR overvoltage (VCC + 0.9 V to VCC + 1.4 V), triggering a shortened 42 ms (typ.) initial delay (tSRC-INI) and enabling rapid functional verification. The device guarantees high-glitch immunity and safe power-up sequencing across mixed-voltage domains.

Key Specifications

Pinout & Package

The STM6519AUARUB6F is packaged in a 6-pin UDFN (Ultra-thin Dual Flat No-lead) package measuring 1.00 mm × 1.45 mm with 0.5 mm pitch, ECOPACK®2 compliant (RoHS, halogen-free), and features wettable flanks for automated optical inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM6519AHARUB6F (4 s tSRC) and MAX6326UR29+T (fixed V_TH, no tSRC), the STM6519AUARUB6F uniquely delivers the longest factory-programmed delay (10 s) without tREC, making it optimal for applications requiring maximum user intent confirmation before system reset.

Availability

STM6519AUARUB6F is available at Aetrix Electronics and suitable for mobile phones, e-books, MP3 players, and portable navigation devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for STM6519AUARUB6F 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for automotive, industrial, and consumer markets.

The STM6519 belongs to ST's Smart Reset™ supervisory IC product line, engineered specifically to replace mechanical reset buttons with intelligent, low-power, single-pin push-button reset solutions for space-constrained portable electronics.

FAQ

What is the factory-programmed tSRC value for STM6519AUARUB6F?

The STM6519AUARUB6F has tSRC factory-programmed to 10.0 seconds (typical), with ±20% tolerance over –40 °C to +85 °C. This value is fixed per the "U" in the order code (per Table 6, DocID022111 Rev 7) and cannot be modified in-circuit. No external components affect this timing.

Does STM6519AUARUB6F include internal pull-up resistors on SR or RST?

No. The "A" in the fourth position (AUAR) indicates active-low SR input with no internal pull-up; the "A" in the fifth position confirms active-low open-drain RST output with no internal pull-up. External pull-up resistors must be added for proper button interface and RST bus termination.

Can STM6519AUARUB6F be used in systems with different SR and VCC voltage domains?

Yes - its fixed SR input threshold and open-drain RST output enable cross-domain use (e.g., SR driven from 3.3 V domain, VCC = 1.8 V). However, VCC must power up before or simultaneously with SR voltage to avoid inadvertent test mode entry (V_SR > V_CC + 0.9 V).

Is there a defined reset pulse width (tREC) for STM6519AUARUB6F?

No. The "R" in the fifth position of the order code (AUAR) explicitly denotes "push-button controlled" - meaning RST deasserts immediately when SR is released, with no factory-programmed tREC. This differs from variants ending in "A", "B", or "F", which specify fixed tREC durations.