THE BIG DEAL: Memory-chip maker Micron Technology Inc. said Monday that it is buying Elpida Memory Inc. for about $750 million in cash. The companies put the deal’s total value at approximately $2.5 billion. That includes about $1.75 billion in future annual installment payments that Micron would make through 2019.

A SMALLER DEAL: Micron is also purchasing Powerchip Technology Corp.’s 24 percent stake in Rexchip Electronics Corp. for approximately $334 million. Elpida has about a 65 percent stake in Rexchip. Combined, this will give Micron Technology an 89 percent stake in Rexchip.