Microchip Technology
XTAL OSC XO 622.0800MHZ LVPECL. Standard Clock Oscillators Ultra-Low Jitter,622.08MHz,LVPECL,<200fs Phase Jitter
IDT, Integrated Device Technology Inc
XTAL OSC XO 250.0000MHZ LVPECL. Standard Clock Oscillators 250 MHz, LVPECL 2.5V, 20 ppm