STM1815TWX7F
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STMicroelectronics STM1815TWX7F

Manufacturer No:
STM1815TWX7F
Manufacturer:
STMicroelectronics
Package:
Tape & Reel (TR)
Description:
IC SUPERVISOR 1 CHANNEL SOT23-3
Delivery:
Payment:
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Product Introduction

Overview

The STM1815TWX7F is a low power reset circuit produced by STMicroelectronics. It is designed to monitor power supplies for microcontrollers, ensuring reliable operation by asserting a reset signal when the supply voltage drops below a preset threshold. This device is part of the STM181x family, which offers various output configurations and features tailored for different applications.

Key Specifications

Parameter Value Description
Supply Voltage Monitoring 3 V, 3.3 V, 5 V Precision monitoring of supply voltages
Output Configuration Active-low, push-pull RST output configuration for STM1815TWX7F
Reset Pulse Width 100 ms (min.) Minimum duration the reset signal is asserted after VCC rises above the reset threshold
Supply Current 4 µA (typ.) Typical supply current consumption
Reset Thresholds 2.55 V, 2.88 V, 3.06 V, 4.37 V, 4.62 V (typ.) Factory-trimmed reset thresholds
Operating Temperature –40 °C to 105 °C Temperature range for guaranteed operation
Package SOT23-3 Package type for the device
Reset Threshold Accuracy ± 2.5% (–40 °C to 105 °C) Accuracy of the reset threshold over the operating temperature range

Key Features

  • Precision Voltage Monitoring: Monitors 3 V, 3.3 V, and 5 V supply voltages with high accuracy.
  • Low Power Consumption: Typical supply current of 4 µA, making it suitable for portable and low-power applications.
  • Multiple Output Configurations: Available in push-pull active-low, push-pull active-high, and open-drain active-low configurations.
  • Reset Pulse Width: Ensures the reset signal is asserted for a minimum of 100 ms after VCC rises above the reset threshold.
  • Power Supply Transient Immunity: Designed to ignore fast transients on VCC, enhancing reliability.
  • Manual Reset Detect: For certain models, features a debounced manual reset capability, ideal for use with mechanical switches.
  • Compact Packaging: Available in the space-saving 3-pin SOT23 package.

Applications

The STM1815TWX7F is ideal for use in various applications where reliable power supply monitoring is crucial, such as:

  • Portable Equipment: Due to its low power consumption and compact packaging.
  • Microcontroller Systems: Ensures the microcontroller starts in a known state during power-up, power-down, and brownout conditions.
  • Embedded Systems: Provides a reliable reset mechanism to prevent code-execution errors.
  • Industrial and Automotive Systems: Operates over a wide temperature range, making it suitable for harsh environments.

Q & A

  1. What is the primary function of the STM1815TWX7F?

    The primary function is to monitor the power supply voltage and assert a reset signal to the microcontroller if the voltage drops below a preset threshold.

  2. What are the supported supply voltages for the STM1815TWX7F?

    The device supports precision monitoring of 3 V, 3.3 V, and 5 V supply voltages.

  3. What is the typical supply current of the STM1815TWX7F?

    The typical supply current is 4 µA.

  4. What is the minimum reset pulse width for the STM1815TWX7F?

    The minimum reset pulse width is 100 ms.

  5. Does the STM1815TWX7F have manual reset capability?

    No, the STM1815TWX7F does not have manual reset capability. This feature is available in models like STM1813 and STM1818.

  6. What is the operating temperature range for the STM1815TWX7F?

    The operating temperature range is –40 °C to 105 °C.

  7. In what package is the STM1815TWX7F available?

    The device is available in the 3-pin SOT23 package.

  8. How accurate is the reset threshold of the STM1815TWX7F?

    The reset threshold accuracy is ± 2.5% over the operating temperature range.

  9. Is the STM1815TWX7F immune to power supply transients?

    Yes, the device is designed to ignore fast transients on VCC.

  10. Can the STM1815TWX7F be used with bidirectional microcontroller reset pins?

    Yes, especially models with open-drain outputs like STM1811 and STM1816, which interface easily with bidirectional reset pins.

Product Attributes

Type:Simple Reset/Power-On Reset
Number of Voltages Monitored:1
Voltage - Threshold:3.06V
Output:Push-Pull, Totem Pole
Reset:Active Low
Reset Timeout:100ms Minimum
Operating Temperature:-40°C ~ 105°C (TA)
Mounting Type:Surface Mount
Package / Case:TO-236-3, SC-59, SOT-23-3
Supplier Device Package:SOT-23-3
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Similar Products

Part Number STM1815TWX7F STM1817TWX7F STM1818TWX7F STM1816TWX7F STM1815RWX7F STM1815SWX7F
Manufacturer STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics STMicroelectronics
Product Status Active Active Active Active Active Active
Type Simple Reset/Power-On Reset Simple Reset/Power-On Reset Simple Reset/Power-On Reset Simple Reset/Power-On Reset Simple Reset/Power-On Reset Simple Reset/Power-On Reset
Number of Voltages Monitored 1 1 1 1 1 1
Voltage - Threshold 3.06V 3.06V 3.06V 3.06V 2.55V 2.88V
Output Push-Pull, Totem Pole Push-Pull, Totem Pole Open Drain, Bidirectional Open Drain or Open Collector Push-Pull, Totem Pole Push-Pull, Totem Pole
Reset Active Low Active High Active Low Active Low Active Low Active Low
Reset Timeout 100ms Minimum 100ms Minimum 100ms Minimum 100ms Minimum 100ms Minimum 100ms Minimum
Operating Temperature -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) -40°C ~ 105°C (TA) -40°C ~ 105°C (TA)
Mounting Type Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount Surface Mount
Package / Case TO-236-3, SC-59, SOT-23-3 TO-236-3, SC-59, SOT-23-3 TO-236-3, SC-59, SOT-23-3 TO-236-3, SC-59, SOT-23-3 TO-236-3, SC-59, SOT-23-3 TO-236-3, SC-59, SOT-23-3
Supplier Device Package SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3 SOT-23-3

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