50 ns multi-port SRAM — what the speed grade buys you
The SN74172N is a multi-port SRAM organized 8 words by 2 bits with a 50 ns access time. The 50 ns figure is the cycle-limiting spec: it sets the minimum read/write cycle time, so the part can keep up with a 20 MHz bus without wait states — fast enough for late-70s/early-80s TTL logic systems but not for modern high-speed memory interfaces. Multi-port means two or more ports can access the memory array simultaneously, which avoids arbitration delays in shared-memory designs — useful in dual-processor or DMA-heavy architectures where both sides need the same scratchpad.
Sourcing the SN74172N — availability and documentation
No stock-holding claim — each lot is sourced per RFQ through independent distribution channels. The part ships in Bulk packaging, which means tubes or trays depending on the date code — not tape-and-reel. Factor this into your incoming inspection and pick-and-place setup if you are running automated assembly.