The IDT72264/72274 are monolithic, CMOS, high capacity, high speed, low power first-in, first-out (FIFO) memories with clocked read and write controls. These FIFOs have three main features that distinguish them among SuperSync FIFOs: First, the data path width can be changed from 9-bits to 18bits; as a result, halving the depth. A pin called Memory Array Select (MAC) chooses between the two options. This feature helps reduce the need for redesigns or multiple versions of PC cards, since a single layout can be used for both data bus widths.