For a bus running at, say, 25 MHz (40 ns cycle), a 15 ns access leaves a 25 ns window for address decode, propagation, and setup before the processor latches data. That margin shrinks if the bus is shared or has additional buffers.
Commercial temperature grade — what it limits
It is not suited for outdoor base stations, engine bays, or unheated enclosures where the ambient can dip below freezing or exceed 70°C.
Infineon lists the CY7C199CN-15ZXC as obsolete. Buyers should expect to qualify date codes and inspect for counterfeit risk, as is standard for obsolete components sourced outside the factory channel.