ON Semiconductor (ON) plunged approximately 12% to around $110 in early trading after announcing a $7 billion all-stock acquisition of Synaptics late yesterday, its largest deal ever. The chipmaker will exchange 1.35 shares for each Synaptics share, representing a 19% premium and diluting existing shareholders by giving Synaptics investors 12% of the combined company. Investors balked at the hefty price tag and di...