4 Mbit SRAM with 70 ns access — the memory slot it fills
The CY62147BV18LL-70BAI is a 4 Mbit static RAM organized as 256K words by 16 bits, with a 70 ns access time. The parallel interface and 70 ns cycle mean it fits into a 16-bit microcontroller or FPGA memory bus that expects asynchronous SRAM timing — no clock, no refresh, just chip-enable and output-enable strobes. It belongs to Infineon's MoBL2 series, a low-power SRAM family designed for battery-backed or portable equipment where standby current matters.
Industrial temperature range and package constraints
The 48-ball FBGA package (0.5 mm pitch typical for this density) demands a 4-layer PCB for signal fan-out — two-layer boards will not route the inner ball rows. The write cycle time matches the read access at 70 ns, so the bus timing is symmetric — no wait-state penalty when alternating reads and writes at the same clock rate.
The bulk packaging (loose trays or tubes, not tape-and-reel) means it ships in quantities typical for prototype or low-volume assembly. For reel-fed pick-and-place, check with your sourcing desk whether a tray-to-reel conversion is available at the distributor.