Device identity and timing parametrics
The CY7C1399BN-15ZXC is a 256Kbit asynchronous SRAM from Infineon (formerly Cypress), organized as 32K x 8 bits. The 15 ns access time sets the window for the address-to-data valid path — the bus controller must sample the output within that window, and the 15 ns write cycle time (word, page) mirrors the same constraint on the write side. The commercial temperature grade (0°C to 70°C) limits it to indoor, controlled-environment boards — no extended or industrial range is specified.
This part is marked obsolete by the manufacturer. Sourcing is through independent distribution channels — quantities are confirmed per RFQ, and the buyer should verify date code and lot traceability at quote time.
Housed in a 28-TSSOP package (0.465" body width, 11.80 mm width) with a surface-mount footprint, the part is supplied in tray format. The supplier device package is designated 28-TSOP I — the standard thin small-outline package for this density class. The 0.65 mm pitch (typical for TSOP I) requires a controlled-impedance layout if the bus is shared with other fast SRAMs, but at 15 ns the trace-length matching is less critical than for synchronous memories.