It is organized as 1M x 36 and clocks at 550 MHz over a parallel interface, which means back-to-back read-write transactions with zero dead cycles — the QDR II+ bus eliminates the turnaround penalty that standard burst SRAMs incur when switching from read to write. This part is designed for high-throughput data buffering in network switches, baseband processors, and test equipment where every nanosecond of bus idle cuts into throughput.
This is not a 3.3 V or 2.5 V legacy SRAM — the power tree must already have a clean 1.8 V rail with ±100 mV regulation, or the part drops out of spec.
Obsolete — no official successor on record
Infineon lists the CY7C1265KV18-550BZXC as Obsolete. No official replacement order code is published in the lifecycle record. Any alternate must be qualified against the 550 MHz clock rate, the 1M x 36 organization, and the 165-FBGA footprint — there is no drop-in second source from Infineon on the current active roster.
This SRAM is not rated for the -40°C cold start of a base station cabinet or the 85°C+ ambient inside a sealed industrial controller. If the system lives in a temperature-controlled data centre, lab, or office environment, the thermal margin is adequate. Outside that envelope, a wider-temperature QDR-family part would be needed — but those are also increasingly obsolete, so the whole class requires careful sourcing.