333 MHz QDR II SRAM — bandwidth and bus-fit
The CY7C1911KV18-333BZC is an 18 Mbit QDR II synchronous SRAM from Infineon, organized as 2M x 9. The 333 MHz clock rate means the device delivers a peak data rate of 666 MHz on the data bus (double-data-rate on reads and writes), which is the figure that governs the throughput ceiling in a high-speed buffer or cache application. QDR II (Quad Data Rate) architecture separates the read and write data ports, eliminating the bus-turnaround penalty that standard synchronous SRAMs incur when switching between read and write cycles. For a network processor or ASIC that streams packets in and out simultaneously, this keeps the bus fully utilized.
Core supply is 1.7 V to 1.9 V (nominal 1.8 V), a narrow window that demands a clean rail — a switching regulator with <10 mV ripple is typical, and the decoupling cap placement within 2 mm of each VDD pin is standard practice for this speed grade. This limits the part to indoor, controlled-environment equipment — telecom central office, data-center line cards, or benchtop test gear. Not suitable for outdoor or extended-temperature industrial enclosures without active cooling.
Active lifecycle — no design-in risk
No pin-compatible second-source or official successor is recorded — the BOM line is single-sourced to this order code.