SiTIME
MEMS OSC XO 20.0000MHZ LVCMOS. Standard Clock Oscillators 20MHz +/-100ppm 3.3V +/-10% -20C+70C
Microchip Technology
MEMS OSC XO 50.0000MHZ CMOS SMD. Standard Clock Oscillators MEMS Oscillator, High Perf, Single CMOS Output, -40C-105C, 10ppm