128K x 8 SRAM with 70 ns access — bus timing and memory map
The M5M5V108DKV-70HIST is a 128K x 8 standard SRAM from Mitsubishi, organized as 128K words of 8 bits each, with a 70 ns access time. The 70 ns rating governs the read/write cycle timing on the bus — a 70 ns access means the data is valid 70 ns after the address is presented, which sets the minimum wait-state requirement for the memory controller. The 128K x 8 organization maps directly to an 8-bit data bus and provides 128 KB of volatile storage, suitable for code scratchpad, data buffering, or lookup tables in embedded systems.