The 72V251 is an 8K x 9 First-In, First-Out memory with clocked read and write controls. It is a 3.3V version of the 72251 device and is applicable for a wide variety of data buffering needs such as graphics, local area networks and interprocessor communication. It has 9-bit input and output ports. The Read Clock can be tied to the Write Clock for single clock operation or the two clocks can run asynchronous of one another for dualclock operation.