74F224

This 64-bit active element First-In-First-Out (FIFO) is a monolithic Schottky-clamped transistor-transistor logic (STLL) array organized as 16 words of 4-bits each. A memory system using the 74F224 can be easily expanded in multiples of 15m+1 words or of 4n bits, or both (where n is the number of packages in the horizontal array).

However, an external gating is required (see Figure 1). For longer words using 74F224, the IR signals of the first-rank packages and OR signals of the last-rank packages must be ANDed for proper synchronization.The 3-State outputs controlled by a single input (OE) make bus connection and multiplexing easy.