Clock fanout for single-ended rails
The 551SCMGI is a 1:4 fanout buffer from Renesas, designed to distribute a single-ended clock to four loads without differential signalling. It handles input and output as plain clock signals, so no CML or LVPECL translation is needed on the board. Maximum frequency is 200 MHz — adequate for most Ethernet, FPGA reference, and base-station clock trees. The supply voltage spans 1.71V to 3.465V, covering 1.8V, 2.5V, and 3.3V rails without an extra regulator.
Industrial temperature and package fit
The 8-UFDFN package with a 2x2 mm body saves board space — the 0.50 mm pitch demands a controlled solder profile but fits tight layouts. Non-differential I/O means the input and output are single-ended; the buyer avoids the termination resistor network that differential buffers require. The 1:4 ratio matches the most common fanout for splitting a master clock to four PLLs or ASICs.