SPXO Crystal Oscillators Epson SPXO Crystal Oscillator products suit a broad variety of requirements with popular interface types (LVCMOS, LVPECL, LVDS), power supplies from 1.8V to 5.0V, and a wide range of frequencies covering 1MHz to 700MHz. They feature 3 architectures: AT-cut crystal (LVCMOS outputs, 1MHz to 75MHz), AT-cut HFF crystal (LVCMOS, LVPECL, and LVDS outputs, 80-175MHz), and AT-cut crystal + PLL (LVPECL and LVDS, 75MHz to 700MHz).