The AAT4290 and AAT4291 SmartSwitch products aremembers of AnalogicTech’s Application Specific PowerMOSFET? (ASPM?) product family. The AAT4290 and
AAT4291 are five and three P-channel MOSFETs, respectively,configured for use as a microprocessor I/O expander.Having independent drain outputs and a commonsource input, they operate with an input voltage rangingfrom 1.8V to 5.5V, making them ideal for 2.5V, 3.3V, or5V systems, as well as systems powered by lithium-ion/polymer batteries. Each switch features a 500ns turn-ontime. The switch states are controlled by AnalogicTech’sSimple Serial Control? (S2Cwire?) interface which permitsease of control and efficiency of size. The quiescentsupply current is very low, typically 4.5μA. In shutdownmode, the supply current is reduced to less than 1μA.