• 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

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.