IDT72021/031/041s are high-speed, low-power, dual-port memory devices commonly known as FIFOs (First-In/First-Out). Data can be written into and read from the memory at independent rates. The order of information stored and ex- tracted does not change, but the rate of data entering the FIFO might be different than the rate leaving the FIFO. Unlike a Static RAM, no address information is required because the read and write pointers advance sequentially. The IDT72021/ 031/041s can perform asynchronous read and write operations, and have four status flags (Full, Empty, Half-Full and Almost Empty/Almost Full).
The IDT72021, IDT72031, and IDT72041 are high‑speed, low‑power CMOS asynchronous FIFO memories offered in 1K × 9, 2K × 9, and 4K × 9 word depths. They provide ultra‑fast access times, output‑enable control, and four status flags for data flow monitoring.
The devices are supplied in 32‑pin DIP and PLCC packages, meet MIL‑STD‑883 Class B requirements, and operate over a wide temperature range from –55 °C (military) to +125 °C. Detailed DC and AC electrical characteristics, pin configurations, and timing diagrams are included.
| Memory depth | 1K × 9 (IDT72021), 2K × 9 (IDT72031), 4K × 9 (IDT72041) |
|---|---|
| Access time | 25 ns (IDT72021), 35 ns (IDT72031/041) |
| Package types | 32‑pin DIP and PLCC |
| Status flags | Full, Empty, Half‑Full, Almost Empty/Almost Full |
The devices provide Full, Empty, Half‑Full, and Almost Empty/Almost Full flags to monitor data overflow and underflow.
They are available in 32‑pin DIP and PLCC packages.
The IDT72021 has a 25 ns access time.