This document describes the DSC-3966/- products produced by Integrated Device Technology, Inc. in 1999, including models such as IDT72V81, IDT72V82, IDT72V83, IDT72V84, and IDT72V85. These products are dual-FIFO memories with features such as 15 ns ultra-high speed access time, low power consumption, asynchronous and simultaneous read and write, space-saving TSSOP package, etc. They are ideal for bidirectional, width expansion, depth expansion, bus-matching, and data sorting applications.