133 MHz synchronous SRAM with 512K x 36 organization
The CY7C1381KVE33-133AXI is a 18 Mbit synchronous SDR SRAM organized as 512K words by 36 bits, clocked at 133 MHz with a 6.5 ns access time from the clock edge.
What the clock and access time mean for your bus
At 133 MHz, the 6.5 ns access time means the SRAM can deliver data within one clock cycle at full speed — the memory controller does not need to insert wait states for reads at this frequency, which keeps the pipeline full in cache-line fills or packet buffer reads. The 36-bit wide data bus (512K x 36) is a natural fit for processors with 32-bit data paths plus parity or ECC — the extra 4 bits can carry byte parity without needing a second chip.
Package and board integration
Housed in a 100-lead TQFP (14x20 mm body), the 0.5 mm pitch fine-pitch QFP requires careful fan-out on a 4-layer board — the inner rows of pins route to inner-layer vias, while the outer rows can escape on the top layer. The surface-mount package is supplied in trays, which is the standard handling format for production pick-and-place — no tape-and-reel reeling needed for this density.