Obsolete — last-time-buy window closed
Infineon Technologies has marked the CY7C1355C-100BGC as Obsolete. This means the manufacturer has discontinued production and no last-time-buy window remains open. Sourcing now runs through independent distribution channels — quantities are lot-specific and confirmed at RFQ.
256K x 36 at 100 MHz — the pipeline decision
This is a 9 Mbit synchronous SRAM organized as 256K words by 36 bits. The 100 MHz clock frequency and 7.5 ns access time set the read/write throughput ceiling — the pipeline depth and output hold time relative to the next clock edge determine whether this part meets the bus timing in a given controller interface. The 36-bit word width suits systems that need parity or ECC bits alongside a 32-bit data path without an extra chip.
NoBL architecture — why it matters for back-to-back transactions
The NoBL (No Bus Latency) series eliminates the dead cycle between read and write operations that conventional synchronous SRAMs require. In a cache-line fill followed by a write-back, the controller can issue a write on the clock edge immediately after the read address — no idle cycle needed. This matters most in systems where memory bandwidth is the bottleneck, such as network packet buffers or DSP scratchpads.
119-ball PBGA — footprint and rework considerations
Housed in a 119-ball plastic BGA with a 14x22 mm body. The 1.27 mm ball pitch is standard for this density — four-layer board fan-out is straightforward, and the package is reworkable with a typical hot-air profile.
Supply rails and interface
The parallel memory interface uses standard LVTTL I/O levels; no external level translation is needed when the controller also runs at 3.3 V.