Device identity — MoBL® 4Mbit asynchronous SRAM
The CY62147VLL-70ZIT is a 4Mbit asynchronous SRAM from the MoBL® series, organized 256K x 16 with a parallel interface. The 70 ns access time and 70 ns write cycle time (word/page) set the bus timing for the memory controller — this is the speed grade that decides whether the part can keep up with the host processor's read/write strobe without wait states.
Package and board-fit — 44-TSOP II
Packaged in a 44-TSOP (0.400", 10.16 mm width) with supplier device package 44-TSOP II, surface-mount. The 70 ns access time means the part is best suited for legacy parallel-bus designs where the controller expects a 70 ns or slower cycle — a 10 ns part like the CY7C1041GE30-10ZSXI would be overkill unless you need the margin for a faster bus.