Digi-Key – Low-current ultra-small pushbutton reset supervisors (Micrel - MIC2788)

Available now from Digi-Key, Micrel’s MIC2788 and MIC2789 are low-current, ultra-small, pushbutton reset supervisors with long set-up delays. The devices feature two manual reset inputs and two reset outputs. They initiate a reset for the reset timeout period when the /MR0 and /MR1 inputs are asserted low for a period longer than the set-up delay. The two manual reset inputs and long set-up period help to avoid unintended system resets. Both manual reset inputs can be tied together if a single push-button reset is desired.

The MIC2788 features integrated pull-up resistors on the /MR0 and /MR1 inputs, while the MIC2789 requires external pull-up resistors. The PDY input pin selects between a 2s, 4s, or 6 s set-up period. Factory-programmed reset timeout periods of 140ms (minimum) and 240 ms (minimum) are available. An active-low, open-drain reset output (/RST) and an active-high, push-pull reset output (RSTP) provide flexibility when interfacing to various microcontrollers, PMICs, or load switches.

Typical applications include smart phones, MP3 players, portable navigation devices, set-top boxes (STBs) and tablets / pads.