描述 Description

The MIC2774 is a dual power supply supervisor that provides under-voltage monitoring, manual reset capability, and power-on reset generation in a compact 5-pin SOT package.Features include two under-voltage detectors, one fixed and one adjustable, and a choice of reset outputs. One undervoltage detector compares VDD against a fixed threshold. Ten factory-programmed thresholds are available. The second, user-adjustable input is compared against a 300mV reference.This low reference voltage allows monitoring voltages lower than those supported by previous supervisor ICs.The reset outputs are asserted at power-on and any time either voltage drops below the programmed threshold voltages and remains asserted for 140ms (min.) after they subsequently rise back above the threshold boundaries.Manual reset functionality can be provided by a switch connected between ground and the /MR input. A wide choice of voltage thresholds provides for a variety of supply voltages and tolerances. Hysteresis is included to prevent chattering due to noise. Typical supply current is a low 3.5μA.

特性 Features

? Monitors two independent power supplies for under-voltage conditions
? One fixed and one user adjustable input
? Choice of factory-programmed thresholds
? Adjustable input can monitor supplies as low as 0.3V
? Generates 140ms (minimum) power-on reset pulse
? Manual reset input
? Choice of active-high, active-low, or open-drain activelow reset outputs
? Inputs may be pulled above VDD(7V abs. max.)
? Open-drain output can be pulled above VDD?(7V abs max.)
? /RST output valid down to 1.2V
? Ultra-low supply current, 3.5μA typical
? Rejects brief input transients
? IttyBitty??5-lead SOT-23 package
? Pin compatible upgrade for MAX6306/09/12

簡(jiǎn)介

MIC2774屬于集成電路（IC）的監(jiān)控器。由制造生產(chǎn)的MIC2774監(jiān)控器PMIC 監(jiān)控器用于監(jiān)視和/或控制電路中的電壓軌，能夠連接微控制器以維持一定的功率限值。監(jiān)控器類型包括電池備用電路、監(jiān)控器、多電壓監(jiān)控器、電源監(jiān)控器、穩(wěn)壓器/監(jiān)控器、復(fù)位計(jì)時(shí)器、定序器、簡(jiǎn)單復(fù)位/上電復(fù)位、智能開/關(guān)控制器、系統(tǒng)管理器、電壓檢測(cè)器和看門狗電路。