72Mbit QDR II+ SRAM at 400 MHz — memory selection memo
It operates from a 1.7V to 1.9V core supply and clocks at 400 MHz, delivering back-to-back read and write transactions on separate data ports without bus-turnaround dead cycles.
At 400 MHz, the QDR II+ interface delivers a peak data rate of 14.4 Gbps per device (36-bit bus at double data rate). The parallel memory interface means the address and control signals must be routed with matched trace lengths and controlled impedance on the PCB. The 165-ball FBGA package (13x15 mm) provides enough signal and ground balls to keep the return path clean at this frequency. Expect to budget at least four decoupling capacitors per supply pin group within 5 mm of the package.
Industrial temperature grade — deployment envelope
The 1.7V to 1.9V supply range aligns with modern 1.8V core logic families, but verify your system's supply tolerance — a 1.8V rail with ±5% regulation stays within the window; a 1.8V rail with ±10% does not.
Listed as Active, meaning Infineon continues production. The base product number CY7C1565 covers multiple speed and temperature variants, so if the 400 MHz industrial grade is the target, the -400BZXI suffix locks in that exact combination.
Package and mounting — layout checklist
Surface-mount 165-ball FBGA with a 13x15 mm body.