55 ns asynchronous SRAM for 5V industrial buses
The Infineon CY62256LL-55ZI is a 256Kbit (32K x 8) asynchronous SRAM from the MoBL series, built for 5V parallel buses in industrial-temperature environments. With a 55 ns access time and a matching 55 ns write cycle, it's sized for microcontroller external memory expansion, data buffers, or configuration storage in systems that need a fast, byte-wide scratchpad. The 28-TSOP I footprint keeps the board area tight while still being hand-solderable with a fine tip and steady hands.
55 ns access time — bus timing fit
The 55 ns access time and 55 ns write cycle time are symmetric for read and write timing.
Industrial temperature grade — where it goes
Rated for -40°C to 85°C ambient, this SRAM is suited for factory automation, motor drives, outdoor telecom cabinets, and engine-bay electronics that see temperature swings. The 28-TSOP I package (0.465" body width) is a standard fine-pitch SOJ-derivative; it's surface-mount only, so plan for reflow or careful hand-soldering.
Lifecycle and sourcing
The CY62256LL-55ZI is listed as Active on Infineon's product status, so there's no last-time-buy risk for new designs. It's RoHS non-compliant per the original spec, so check your assembly's exemption requirements if you're in a RoHS-restricted region.