These comparators are optimized for low power 1.8V, single-supply applications with greater than rail-to-rail input operation. The internal input hysteresis eliminates output switching due to internal input noise voltage, reducing current draw. The open-drain output of the MCP6566/6R/6U/7/9 family requires a pull up resistor and it supports pull-up voltages above and below VDD which can be used to level shift. The output toggle frequency can reach a typical of 4 MHz (typical) while limiting supply current surges and dynamic power consumption during switching.