256Kbit asynchronous SRAM for legacy parallel buses
The Infineon CY7C199CNL-15VXI is a 256Kbit asynchronous SRAM organized as 32K x 8 bits with a parallel memory interface, housed in a 28-SOJ surface-mount package.
15 ns access time and write cycle timing
With a 15 ns access time and matching 15 ns write cycle time (word, page mode), this SRAM delivers a 66 MHz equivalent bus throughput — the limiting factor is the bus turn-around time, not the memory itself. The 15 ns access means the address-to-data valid delay is 15 ns max; a 5V CPLD or FPGA driving the bus must meet this setup window at the receiver, which tightens the timing closure on a 66 MHz bus.
Infineon lists the CY7C199CNL-15VXI as Obsolete.
28-SOJ package and board integration
The J-lead form factor allows visual solder-joint inspection and is rework-friendly with a hot-air station — no bottom-side thermal pad to manage. Supplied in Tube, the part is suitable for hand-place or low-volume assembly; the tube quantity is typically 13-15 units per tube depending on the supplier's packing standard.