Quad 2-input EXCLUSIVE-NOR gate with Schmitt-trigger inputs and open-drain output

The 74HCS266 is a quad 2-input EXCLUSIVE-NOR gate with open-drain output. Inputs include clamp diodes. This enables the use of current limiting resistors to interface inputs to voltages in excess of VCC.

All inputs are Schmitt-trigger inputs, capable of transforming slowly changing input signals into sharply defined, jitter-free output signals.