MIC2777

MIC2777 MIC2777 Micrel, Inc. Dual Micro-Power Low Voltage Supervisor General Description The MIC2777 is a dual power supply supervisor that provides under-voltage monitoring, manual reset capability, and poweron reset generation in a compact 5-pin SOT package. Features include two under-voltage detectors, one fixed and one adjustable, and both active-high and active-low reset outputs. One under-voltage detector compares VDD against a fixed threshold. Ten factory-programmed thresholds are available. The other under-voltage detector is user-adjustable. The reset outputs are asserted for no less than 140ms at power-on and any time VDD or the input voltage drops below the corresponding reference voltage. They remain asserted for the timeout period after the input voltage and VDD subsequently rise back above the threshold boundaries. A reset can be generated at any time by pulling down on the adjustable input. Hysteresis is included to prevent chattering due to noise. Typical supply current is a low 3.5µA. Features Monitors two independent power supplies for under-voltage conditions One fixed and one user adjustable input 1.5% theshold accuracy Choice of factory-programmed thresholds User-adjustable input can monitor supplies as low as 0.3V Generates 140ms (minimum) power-on RESET pulse Manual reset capability Both active-high and active-low RESET outputs Input may be pulled above VDD (abs. max.) /RST output valid down to 1.2V Ultra-low supply current, 3.5µ...