1Mbit parallel NOR flash with 70 ns read access
The SST39SF010A-70-4C-WHE is a 1Mbit parallel NOR flash memory organized as 128K x 8 bits, with a 70 ns access time that sets the read-cycle window for the host bus. It operates from a single 4.5V to 5.5V supply, which means it is a 5V-only part. The write cycle time is 20 µs per word or page, typical for this generation of parallel NOR flash.
The package is a 32-TFSOP (0.488-inch body width, 12.40 mm) with a standard 32-TSOP footprint. The 0.50 mm pin pitch is fine enough that a 2-layer PCB can route the address and data bus if the traces are kept short and the supply decoupling is local; a 4-layer board with a solid ground plane is safer for signal integrity on the parallel bus.