ST STM1811LWX7F

简单复位/加电复位4.62V1

Overview

■ ± 2.5% reset threshold accuracy: (–40 °C to 105 °C) ■ Available in the SOT23-3 package ■ Fully compatible with DS181x and MXD181x products. Description STM181x devices are low power reset devices used to monitor power supplies for microcontrollers. They perform a single function: asserting a reset signal whenever VCC supply voltage drops below a preset value and keeping it asserted until VCC has risen above the preset threshold for a minimum period of time (trec). They provide excellent circuit reliability without additional external components when used with +3.0 V / +3.3 V (STM1815–STM1818), and +5 V (STM1810–STM1813) power supply systems. A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance condition. When an invalid VCC condition occurs, the reset output (RST) is forced low (or high in the case of RST) and remains asserted for trec after VCC rises above the reset threshold.  STM1811LWX7F has an active-low RST output. The open-drain devices STM1811LWX7F also have an internal pull-up resistor to VCC. When used to initiate manual reset, RST debounces signals from devices such as mechanical switches. For devices with this feature, the release of the external switch triggers the reset period. The STM181x devices are guaranteed to output the correct logic state for VCC down to 1.0 V (0 °C to +105 °C). They also provide a reset comparator designed to ignore fast transients on VCC. Reset thresholds are available between +2.55 V and +4.62 V. These small, low power devices are ideal for use in portable equipment.  All are available in the space-saving 3-pin SOT23 package, and are specified from –40 °C to +105 °C.

Features

Tape & Reel (TR) Package
Simple Reset/Power-On Reset type
Minimum supply voltage of 1.2V
4μA operating supply current

1 Number of Voltages Monitored

Applications

There are a lot of STMicroelectronics
STM1811LWX7F Voltage Supervisors applications.

• Power distribution systems of operating room
• Power distribution systems of infant care room
• Power distribution systems of ICU
• Power distribution systems of CCU
• emergency room
• Medical-specific isolation transformer
• Medical-specific insulation monitor
• Transformer load monitoring equipment
• External alarm
• Display equipment