The IDT72V3631/72V3641/72V3651 are pin and functionally compatible versons of the IDT723631/723641/723651, designed to run off a 3.3V supply for exceptionally low-power consumption. These devices are monolithic highspeed, low-power, CMOS clocked FIFO memory. It supports clock frequencies up to 67 MHz and has read access times as fast as 10ns. The 512/1,024/2,048 x 36 dual-port SRAM FIFO buffers data from port A to Port B. The FIFO memory has retransmit capability, which allows previously read data to be accessed again. The FIFO operates in First Word Fall Through mode and has flags to indicate empty and full conditions and conditions and two programmable flags (Almost-Full and Almost-Empty) to indicate when a selected number of words is stored in memory. Communication between each port may take place with