The Renesas Electronics clock buffer is a low cost, high-speed single input to four output clock buffer. The 621S has best in class additive phase jitter of sub 50fsec.

Low additive phase jitter RMS of 50fs
Extremely low skew outputs of 50ps
Low cost clock buffer
Packaged in 8-pin SOIC and 8-pin DFN which are lead(Pb) free
Input/output clock frequency up to 200 MHz
Non-inverting output clock
Ideal for networking clocks
Output Enable mode of tri-states outputs
Advanced low power CMOS process
Extended temperature range of -40°C to +105°C