MIC2775

MIC2775 Micro-Power Voltage Supervisor IttyBitty® General Description The MIC2775 is a power supply supervisor that provides undervoltage monitoring, manual reset capability, and power-on reset generation in a compact 5-pin SOT package. Features include an undervoltage detector, a delay generator, a manual reset input, and both activehigh and active-low reset outputs. The undervoltage detector compares VDD against a fixed threshold. Ten factory-programmed thresholds are available. The reset outputs are asserted for no less than 140ms at power-on and any time the input voltage drops below the reference voltage. It remains asserted for the timeout period after the input voltage subsequently rises back above the threshold boundary. A reset can be generated at any time by asserting the manual reset input, /MR. This reset output will remain active at least 140ms after the release of /MR. The /MR input can also be used to daisychain the MIC2775 onto existing power monitoring circuitry or other supervisors. Hysteresis is included to prevent chattering due to noise. Typical suppy current is an ultralow 3.5µA. Datasheets and support documentation are available on Micrel’s website at: www.micrel.com. Features Monitors power supply for undervoltage conditions Choice of factory-programmed thresholds Generates 140ms (minimum) power-on reset pulse Manual reset capability Both active-high and active-low reset outputs /RST output valid down to 1.2V Ultra-low supply current, 3...