18Mbit synchronous SRAM for cache and buffer memory
The Infineon CY7C1381KVE33-133AXIT is a 18Mbit synchronous SDR SRAM organized as 512K x 36, clocked at 133 MHz with a 6.5 ns access time. The 36-bit wide data bus suits applications like network packet buffers, cache memory for processors, or high-speed data acquisition where a single chip provides the full word width without external muxing.
Parametric fit: clock, access, and voltage headroom
At 133 MHz the memory supports a 7.5 ns cycle time; the 6.5 ns access time from clock edge to data valid means the controller has roughly 1 ns of setup margin at the receiver before the next clock edge, assuming matched trace delays. The supply range of 3.135V to 3.6V covers the nominal 3.3V rail with ±5% tolerance — a common industrial bus voltage. The 0.465V headroom below the 3.6V abs-max ceiling gives the regulator room to ride through transients without hitting the clamp.
The 100-TQFP supplier package variant shares the same footprint.
The base product number CY7C1381 indicates a mature synchronous SRAM family with multiple speed and temperature grades sharing the same pinout. The Tape & Reel packaging suits automated pick-and-place assembly in medium-to-high volume runs.