View s-24s45i10 datasheet:

S-24S45I10 IL08 C-MOS 256-BIT SERIAL NVRAM —TOP VIEW— 1 4 CE DO CE IN 1 VDD 8 2 SK 3 DI SK IN 2 7 STORE 6 RECALL 7 STORE DI IN 3 6 RECALL DO OUT 4 GND 5 INPUT OUTPUT CE : CHIP ENABLE DO : SERIAL DATA SK : SERIAL CLOCK DI : SERIAL DATA RECALL : RECALL STORE : STORE 6 STATIC ROW CONTROL RECALL RAM 7 DECODER LOGIC STORE 256-BIT 8 VDD 5 GND 1 CE 3 INSTRUCTION COLUMN 4 DI DO REGISTER DECODER 2 SK INSTRUCTION 4-BIT DECODER COUNTER