What this 18Mbit synchronous SRAM does on the bus
The CY7C1383B-100AC is a 18Mbit synchronous SRAM organized as 1M x 18, clocked at 100 MHz with a pipelined read/write architecture. The 8.5 ns access time means the first word appears on the bus that many nanoseconds after the address is latched on the rising clock edge — a figure that sets the minimum cycle time for back-to-back reads in a cache or buffer application. The 100-TQFP (14x20 mm) package sits on a 0.5 mm pitch LQFP footprint — the same land pattern used by many synchronous SRAMs in this density class, so a board laid out for a compatible part may accept this device without a spin.
Infineon lists the CY7C1383B-100AC as Obsolete. For a BOM line that already uses this order code, the procurement decision is straightforward: source from the open market against a confirmed requirement.
Timing and supply — the two constraints that govern fit
The 100 MHz clock rate and 8.5 ns access time together define the read latency budget. In a pipelined synchronous interface, the controller must account for the pipeline depth (typically two cycles for the first read) plus the access time from the clock edge. A system designed for a 133 MHz or 166 MHz SRAM will not meet timing if this part is substituted without adjusting the controller's wait-state configuration. The supply tolerance is 3.135V to 3.6V — a 3.3V nominal rail with ±5% regulation stays inside this window.