SCDS145C October 2003 – June 2018 SN74CB3Q3253
The application shown here is a 4-bit bus being multiplexed between two devices. the OE and S pins are used to control the chip from the bus controller. This is a very generic example, and could apply to many situations. If an application requires less than 4 bits, be sure to tie the A side to either high or low on unused channels.