256Kbit asynchronous SRAM in a 28-SOJ – what you need to know
It uses a parallel interface and comes in a 28-SOJ surface-mount package. This part is typically used as a fast scratchpad, cache buffer, or working memory in embedded systems, telecom equipment, and industrial controllers where deterministic read/write timing matters.
15 ns access time – timing closure for the bus
For a processor running at 33 MHz or slower, this gives comfortable margin on a standard asynchronous memory bus. If your system clock is faster, you will need a synchronous SRAM or a faster asynchronous part with a 10 ns or 8 ns rating.
Industrial temperature range – where it fits
If your design runs at 3.3V, look for a 3.3V-rated variant in the CY7C199 family.
Obsolete – sourcing reality
Infineon lists the CY7C199C-15VI as obsolete. New production is not available from the factory. For a new design, consider a current-production 32K x 8 asynchronous SRAM in the same 28-SOJ footprint from Infineon or a second-source vendor such as ISSI or Alliance Memory.
28-SOJ package – footprint and compatibility
The 28-SOJ (Small Outline J-lead) body measures 7.62 mm wide, a common footprint for 32K x 8 SRAMs. Many 28-pin SOJ parts from different manufacturers share the same pinout, which simplifies cross-sourcing. The tube shipment is typical for prototype and low-volume builds; reel quantities may be available through surplus channels.