Datasheet Microchip MIC2774 — Ficha de datos

MIC2774
Dual Micro-Power Low Voltage Supervisor General Description Features The MIC2774 is a dual power supply supervisor that
provides undervoltage monitoring, manual reset capability,
and power-on reset generation in a compact 5-pin SOT-23
package. Features include two undervoltage 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 for the monitoring of voltages lower than those
supported by previous supervisor ICs. Monitors two independent power supplies for
undervoltage conditions One fixed and one user-adjustable input Choice of ten factory-programmed thresholds Adjustable input can monitor supplies as low as 0.3V Generates 140ms (min.) 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.) /RST output valid down to 1.2V Ultra-low supply current, 3.5ВµA typical Rejects brief input transients IttyBittyв„ў 5-pin SOT-23 package Pin-compatible upgrade for MAX6306/09/12 The reset outputs are asserted at power-on and at any
time either voltage drops below the programmed threshold
voltage 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 3.5ВµA.
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