32Mbit pseudo-SRAM at 133 MHz Quad SPI
The IS66WVQ8M4DBLL-133BLI is a volatile pseudo-SRAM organized 8M x 4, clocked at 133 MHz over a Quad I/O SPI interface. At that speed the 45 ns write-cycle time is the limiting factor for burst-write throughput — the Quad I/O bus delivers four bits per SCK edge, but the memory array itself needs that 45 ns per word or page write before the next operation can begin.
24-TFBGA footprint and board integration
The supplier device package is a 24-TFBGA (6x8 mm) with surface-mount tray packing. BGA rework is sensitive to the paste-print and reflow profile — the 45 ns write cycle is a memory-array spec, not a thermal constraint, but the reball process for this pitch requires a hot-air or IR rework station capable of uniform preheat across the 6×8 mm die area to avoid package crack on thermal cycling. Because the memory is volatile, there is no non-volatile storage content to preserve during a power-off cycle — the bring-up checklist does not need to account for data-retention state, which simplifies the boot sequence compared to flash or EEPROM-backed designs.