The RelChip® RC21428801 is a 288K by 1 serial RAM. The control, address, and data are transmitted to/from the memory via a SPI interface. The RC21428801 also provides parity options and programmable operating modes: byte, page, and sequential. The RC21428801 includes battery backup to maintain memory state during power outages.
The RC21428801 supports byte, page, or sequential operating modes. Byte mode supports 8-bit, 9-bit, and 8-bit plus parity transfers. Page mode support 32 byte block read/writes (in 8 or 9-bit modes). Sequential mode operates on byte locations sequentially until stopped (SPI deselect).