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STM6519APAAUB6F

Smart Reset IC, 7.5s delay, active-low OD output, 210ms tREC, 2-5.5V, 1µA, UDFN-6 1x1.45mm

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Manufacturer Part：

STM6519APAAUB6F

Package：

UDFN-6 (1.0 x 1.45 x 0.55 mm)

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Description

Product Overview

The STM6519APAAUB6F from STMicroelectronics is a single-pin Smart Reset IC that provides push-button reset with an extended setup delay of 7.5 seconds, preventing accidental resets from brief button presses. Operating from 2V to 5.5V with 1 µA supply current, it features an active-low open-drain reset output with 210 ms recovery timeout in a tiny UDFN-6 (1.0 x 1.45 mm) package.

Key Specifications

  • Function: Single-pin Smart Reset (push-button supervisor)
  • Smart Reset Delay (tSRC): 7.5 seconds typical (factory-programmed)
  • Recovery Timeout (tREC): 210 ms typical (factory-programmed)
  • SR Input: Active-low, no internal pull-up
  • Reset Output: Active-low, open-drain
  • Supply Voltage: 2.0V ~ 5.5V
  • Supply Current: 1 µA max
  • Operating Temperature: -40°C ~ 85°C
  • Package: UDFN-6 (1.0 x 1.45 x 0.55 mm)
  • RoHS: ECOPACK2 compliant

Features

  • Extended Smart Reset setup delay prevents accidental resets
  • Single push-button serves dual purpose: interrupt (short press) and hard reset (long press)
  • Factory-programmable tSRC from 0.5s to 10s in 0.5s steps
  • Factory-programmable tREC timeout options
  • Ultra-low 1 µA supply current
  • Open-drain reset output for wired-OR configuration
  • Compact UDFN-6 package for space-constrained designs

Applications

  • Consumer electronics reset protection
  • Handheld device power-cycle control
  • Embedded system hang recovery
  • Smartphone and tablet reset management
  • Industrial controller reset with debounce

The STM6519APAAUB6F from STMicroelectronics is a Smart Reset supervisor IC that solves the common problem of accidental system resets caused by brief push-button closures. The device requires the reset button to be held for a factory-programmed 7.5 seconds before asserting the reset output, effectively distinguishing between a software interrupt (short press) and a hardware reset (long press). The APAA variant features an active-low open-drain reset output with a 210 ms recovery timeout, ensuring a clean reset pulse duration. Operating from 2V to 5.5V with just 1 µA supply current, the device is ideal for battery-powered consumer electronics. The tiny UDFN-6 package (1.0 x 1.45 mm) enables placement in space-constrained designs.

The STM6519APAAUB6F monitors the Smart Reset (SR) input pin for an active-low condition. When the push-button is pressed, the device starts an internal timer. If the SR input returns high before the 7.5-second setup delay (tSRC) expires, no reset is generated — the MCU can handle the button press as a normal interrupt. If the SR input remains low for the full 7.5 seconds (indicating a deliberate long press or a hung system), the RST output asserts low. The reset output remains low for the factory-programmed recovery timeout (tREC = 210 ms) after the SR input goes high, ensuring the MCU receives a clean reset pulse regardless of the button release timing. The open-drain output allows wired-OR connection with other reset sources such as voltage supervisors.

Pin Name Function
1 NC No Connect
2 GND Ground
3 RST Reset output (active-low, open-drain)
4 VCC Power supply (2-5.5V)
5 SR Smart Reset input (active-low, connect to push-button)
6 NC No Connect

The STM6519APAAUB6F is used in consumer electronics where a single push-button serves dual purpose: a short press triggers a software interrupt (e.g., menu select), while a 7.5-second hold generates a hardware reset for system recovery. In handheld devices, the long delay prevents accidental resets during normal handling. For embedded controllers that may hang, the Smart Reset provides a reliable recovery mechanism without requiring a dedicated reset button. The 210 ms tREC ensures the MCU has sufficient time to complete its reset sequence. The ultra-low 1 µA supply current makes it transparent to the battery budget in always-on applications.

Model Manufacturer Key Difference
STM6519AHARUB6F STMicroelectronics 4.0s tSRC, no tREC (push-button controlled)
STM6519ALARUB6F STMicroelectronics 6.0s tSRC, no tREC
MAX811MEUS-T Analog Devices Simple reset, no Smart Reset delay
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