PMC-Sierra announced Tuesday that it has received and is evaluating an unsolicited proposal from Microsemi to acquire the company for $2.4 billion, or $11.50 per share, in cash and stock. Sunnyvale, Calif.-based PMC-Sierra, which agreed earlier in October to be acquired by Skyworks Solutions for $2 billion, said the board believes the $2.4 billion proposal from Microsemi "would reasonably be expected to lead to a superior proposal," though it still recommends the all-cash transaction with Skyworks Solutions valued at $2 billion.