The 100EL16 is a 5V differential receiver that contains an internally supply voltage source, VBB. When used in a single ended input condition the unused input must be tied to VBB. When operating in this mode use a 0.01 F capacitor to decouple VBB and VCC and also limit the current sinking or sourcing capability to 0.5mA. When VBB is not used it should be left open.