The LFSPXO025494 is a 3.2 x 2.5mm 50ppm Crystal Oscillator with ceramic with a seam sealed metal lid, hermetically sealed. The CFPS-39 series oscillator with logic-1 to pad-1 enables oscillator output, logic-0 to pad-1 disables oscillator output, when disabled the oscillator output goes to the high impedance state. No connection to pad-1 enables oscillator output.