The MM54HC253 MM74HC253 utilizes advanced silicongate CMOS technology to achieve the low power consumption and high noise immunity of standard CMOS integrated circuits along with the capability to drive 10 LS-TTL loads The large output drive and TRI-STATE features of this device make it ideally suited for interfacing with bus lines in bus organized systems When the output control input is taken high the multiplexer outputs are sent into a high impedance state When the output control is held low the associated multiplexer chooses the correct output channel for the given input signals determined by the select A and B inputs