RT12770 23K256-I/P Microchip Sram Serial 256K 2.7V Pdip8
The 23K256-I/P is a 256K SPI bus low-power Serial SRAM Device. The bus signals required are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Communication to the device can be paused via the hold pin (hold).