The CY7C2563KV18-450BZC carries an official Obsolete product status. No direct LTB window or successor order code is recorded in the lifecycle entry. For a BOM line that still calls out this exact density and speed grade, procurement now depends on independent-distribution stock — new-old-stock or surplus inventory that was manufactured before the EOL cutoff.
450 MHz clock — the timing-critical spec
The headline rating here is the 450 MHz clock frequency. In a QDR II+ SRAM, that clock drives both read and write ports simultaneously, giving an effective data rate of 900 MHz on the I/O bus. For a system architect or FPGA designer, that 450 MHz figure sets the timing closure target for the controller interface — board trace length matching, PLL jitter budget, and setup/hold margins all tighten around this number. The 72Mbit density organized as 4M x 18 is sized for deep packet buffers in networking gear or high-speed data acquisition where the read-write turnaround penalty of a conventional SRAM would cost a cycle.
165-ball LBGA — layout considerations
The 165-LBGA (13x15 mm body per the supplier device package) is a fine-pitch BGA. For the PCB layout engineer, that means via-in-pad or microvia fanout under the ball field, plus a full ground plane under the center of the package for thermal relief.