166 MHz synchronous pipeline — what the clock and access time mean for your bus
The CY7C1354CV25-166AXCT is a 9 Mbit synchronous SRAM from Infineon's NoBL™ (No Bus Latency) family, organized as 256K words by 36 bits. The 166 MHz clock drives a pipelined read/write architecture that eliminates the dead cycle between consecutive reads — the NoBL™ feature lets the next address be presented on the clock edge immediately after the previous read, so back-to-back reads sustain full bus throughput without wait states. The 3.5 ns access time is the time from clock edge to valid data at the output pins. At 166 MHz (6 ns period), the pipeline depth means the first read incurs a latency of two clocks, but subsequent reads deliver one data word per clock. This matters for high-bandwidth data paths like network packet buffers or DSP coefficient tables where the bus is the bottleneck, not the core.
2.5 V supply rail and 36-bit word width — board integration
The 100-TQFP (14x20 mm) package has 0.5 mm pitch, so the board needs a 4-layer stack-up for clean fan-out of the 36 data lines plus address and control signals. The 36-bit word width matches a 32-bit data bus with 4 parity/ECC bits, or a 36-bit wide FIFO interface, without external byte-muxing logic. The commercial temperature range (0°C to 70°C) limits this part to indoor, controlled-environment equipment — telecom line cards, test instrumentation, or server DIMM buffers. It is not rated for industrial or automotive ambient conditions.
Last Buy — what the lifecycle status means for procurement
Infineon has placed the CY7C1354CV25-166AXCT in Last Buy status. This is the final ordering window before the part becomes permanently unavailable from the factory. For a BOM line that depends on this exact footprint and timing, the Last Buy window is the time to secure lifetime-buy inventory or qualify a replacement. Sourced through independent distribution against an RFQ; availability and pricing confirmed at quote time.