DS1230Y-70 256K Nonvolatile SRAM by Dallas Semiconductor. package: 28-pin wide DIP Download Dallas Semiconductor DS1230Y-70 datasheet: Please note these are NOS (New Old Stock Items), however the lithium battery backup part of this chip is disconnected and does not go live until it is programmed for the first time, thus extending unused shelflife. RoHS compliant: no