RAM module build - part 1

Hi Ben, I need your help. I am building this computer and I am now at the RAM part. I ordered sn74ls189AN from China. But when I connect them and try to set an address they get very hot. I have checked the wiring and even took a new breadboard and built everything new. But as soon when I set either one address pin or the write enable pin high the IC (and I tried all five) get hot. I have checkt the voltage. I am wondering if I got fake ICs. Or is there a difference between LS189N and 189AN?