2.79V threshold supervisor in a SOT-23-6
It is a voltage supervisor in the TPS3808 family, built for applications that need a clean, glitch-free reset during power-up, brown-out, or supply dropout.
What the 2.79V threshold and adjustable timeout mean for the BOM
The 2.79V threshold is set for monitoring a nominal 3.3V rail with margin — it triggers reset before the rail drops below the minimum operating voltage of most 3.3V logic. The reset timeout is adjustable/selectable via an external capacitor on the CT pin, letting you match the delay to the power-up settling time of the downstream load. For a typical microcontroller with a 10 ms startup, you'd pick a capacitor that sets the timeout to around 20 ms to guarantee the supply is stable before the MCU starts executing code. The active-low, open-drain output lets you wire-OR the reset signal with other supervisors or a manual reset button on the same pull-up resistor. The output can sink enough current to drive the reset input of a CMOS MCU or FPGA directly.