64Kbit asynchronous SRAM in 28-SOJ — what this part is
The Infineon CY7C185-35SC is a 64Kbit asynchronous SRAM organized as 8K x 8 bits, with a 35 ns access time and parallel interface. Housed in a 28-SOJ (300 mil) surface-mount package, this part was designed for cache, scratchpad, or data-buffer roles in legacy 8-bit and 16-bit microcontroller and DSP systems where fast, simple memory expansion was needed without clock management.
35 ns access time — bus timing fit
The 35 ns access time is the key timing parameter for this asynchronous SRAM. For a legacy 8-bit controller running at 10-12 MHz or a 16-bit DSP with a 20-25 MHz bus, this timing provides adequate margin without wait states. If your system bus runs faster than about 28 MHz, you will need to budget for access-time compatibility — or consider a faster SRAM variant.
28-SOJ package — footprint and board fit
This is a surface-mount package with J-bend leads on 1.27 mm pitch. The SOJ footprint is distinct from SOIC — the J-lead profile saves board area but requires a specific land pattern. If your existing board uses a 28-pin SOIC or TSOP footprint, a layout change is needed.
Commercial temperature grade — deployment boundary
If your application sees temperature excursions outside 0°C to 70°C — such as outdoor telecom cabinets, factory floors, or under-hood electronics — this part will not meet the thermal specification and an industrial-temperature SRAM should be selected.