The CY7C1328G-133AXIT: Sourcing now runs through independent distribution — each reel is lot-verified and the date-code laser etch is cross-checked against Infineon's own marking standards to screen out re-marked or relabeled stock.
133 MHz synchronous SRAM — timing and organization
The CY7C1328G-133AXIT is a 4.5 Mbit synchronous SRAM organized as 256K x 18 bits. The 18-bit word width is useful for systems that need a parity or ECC check bit alongside each 16-bit data word — a common pattern in networking and telecom line cards where single-bit error detection is non-negotiable. It runs at a 133 MHz clock with a 4 ns access time, meaning the first word appears on the bus within 4 clock cycles after the address is latched — the pipelined SDR architecture keeps the data flowing at the clock rate once the pipeline is full.
Industrial temperature and surface-mount footprint
The 100-TQFP package (14x20 mm body,) is a standard fine-pitch QFP with 0.5 mm lead pitch, reflow-compatible with lead-free profiles. The memory interface is parallel — all address and data lines route to the controller in parallel, which means the PCB layout must keep trace lengths matched within a few hundred mils to avoid skew on the synchronous bus. The 100-LQFP footprint is well-documented in Infineon's application notes; the thermal pad on the underside of the TQFP variant should be soldered to a copper plane for heat sinking.