OSC 644.53125MHZ 5 X 3.2MM LVPECL; Frequency Nom:644.53125MHz; Frequency Stability + / -:20ppm; Oscillator Case:SMD 3.2mm x 5mm; Supply Voltage Nom:3.3V; Product Range:Si545 Ultra Series; Operating Temperature Min:-40 C; ;RoHS Compliant: Yes