The Infineon (formerly Cypress) CY7C1570KV18-550BZXI is a 72Mbit synchronous SRAM using DDR II+ (Double Data Rate II+) architecture, organized as 2M words by 36 bits. It clocks at 550 MHz, delivering back-to-back read/write throughput without dead cycles between transactions — the DDR II+ bus-turnaround advantage over standard synchronous SRAM. The 36-bit wide word suits networking line cards, telecom switch fabrics, and high-end test equipment where a wide data path matches the ASIC or FPGA bus natively. The part comes in a 165-ball fine-pitch BGA (13x15 mm FBGA package).
At 550 MHz, the DDR II+ interface transfers data on both clock edges, so the effective data rate is 1.1 G transfers per second per pin. With a 36-bit bus, that is roughly 39.6 Gbit/s aggregate bandwidth. The synchronous pipeline means the SRAM can sustain back-to-back reads or writes without inserting idle cycles, critical for high-utilization buffer applications like packet processing. The 550 MHz rating is the maximum clock; the part also supports lower frequencies for power-sensitive modes.
Last Buy lifecycle — sourcing reality
Buyers filling a BOM line for an existing production run should secure final-order quantities through the LTB window. After that, availability shifts to the surplus and broker channel.
The 165-ball LBGA (13x15 mm FBGA) is a fine-pitch BGA — standard for high-density memory devices. Surface-mount assembly; MSL level should be verified from the latest Cypress handling note.