DRAM CMOS 1MB, 81C4256, DIP20; Memory type:DRAM; Memory size:1Mbit; Memory configuration:256K x 4bit; Temp, op. max:70°C; Temp, op. min:0°C; Base number:81; Case style:DIP; IC Generic number:81C4256; Logic function number:81C4256; Pins, No. of:20; Temperature range, IC:Commercial; Temperature, operating range:0°C to +70°C; Time, access:70ns