Add a V_CC bypass capacitor (0.1 µF or more). Either enable (G pin) input can turn on the receivers, so connect the desired enable to a compatible logic line output. The other enable input must be tied to the inactive state supply rail. If the receivers must always be active, then connect both enables to the supply rail such that at least one is set to an active-state rail. V_CC must be 5 V within 10% and logic inputs must provide TTL-compatible voltage levels A & B Inputs can lead to an external connector or can be left unconnected. The last receiver on a cable requires termination, either on-board or use as an external resistor. Unused Y outputs can be left unconnected.