133 MHz synchronous SRAM — what the clock and access time mean for your design
The CY7C1352B-133AC is a Cypress 4.5 Mbit synchronous SRAM organized as 256K x 18 bits, clocked at 133 MHz with a 4.2 ns access time. The 133 MHz clock rate means the part can sustain back-to-back read or write transactions every cycle, with no dead cycles between accesses, as long as the pipeline is kept full.
Package and footprint — 100-TQFP, surface-mount assembly
The CY7C1352B-133AC comes in a 100-lead TQFP with a 14 mm x 20 mm body (100-TQFP). It is a surface-mount package, so the board footprint is a standard 0.5 mm pitch QFP land pattern. The package is not a fine-pitch BGA, so visual inspection and rework are straightforward with a hot-air station.
If you have an active BOM that calls out this exact order code, you cannot rely on factory lead times — every unit must be sourced from existing inventory held by distributors or brokers. The 256K x 18 synchronous SRAM function is still served by current-production parts from Cypress (now Infineon) and other vendors, but none are pin-compatible drop-in replacements without a board spin. For a production run, the safest path is to qualify a currently-manufactured synchronous SRAM in the same package and pinout family, then respin the board if needed.