18 Mbit synchronous SRAM for high-throughput buffering
The Infineon CY7C1383D-133AXC is a 18 Mbit synchronous SDR SRAM organized as 1M x 18, clocked at 133 MHz with a 6.5 ns access time. It uses a parallel interface and operates from a 3.135V to 3.6V supply.
133 MHz clock and 6.5 ns access — timing budget for the bus
At 133 MHz the clock period is roughly 7.5 ns, and the 6.5 ns access time leaves about 1 ns of margin for PCB trace delay, clock skew, and setup/hold at the controller. That is tight — you will want to verify timing closure with the memory controller's AC timing specs, especially if the board has more than one load on the data bus. The synchronous SDR architecture eliminates the dead cycles of asynchronous SRAM on back-to-back reads, which is why this part was common in packet buffers and FIFO emulation.
It belongs in office-environment switches, test equipment, or server motherboards — not in a motor drive enclosure or outdoor cabinet. If your BOM calls for industrial temperature, look at the -133AXI variant (if still available) or a pin-compatible synchronous SRAM that carries the -I suffix.
That means new production has stopped and the only channel is surplus or broker inventory. Every lot we source is date-code and marking verified against Infineon's factory etch standards.