What this 1:10 clock buffer does on your board
The 74FCT3807SOG is a single-circuit fanout buffer that takes one LVTTL clock input and distributes it to ten CMOS or TTL outputs. The 1:10 ratio means you can drive up to ten clock loads from one source without loading the upstream oscillator or PLL — the buffer isolates the input side from the output capacitance. Maximum frequency is 100 MHz.
Supply voltage and logic compatibility
The supply range is 3V to 3.6V. This is a 3.3V nominal part — it does not accept 5V on the input or output pins. If your upstream clock source is 5V LVCMOS, you need a level translator or a series resistor clamp before the 74FCT3807SOG input. The outputs are CMOS and TTL compatible at 3.3V, which matches most modern FPGAs, ASICs, and 3.3V microcontrollers. The input is LVTTL, which thresholds at 0.8V (VIL) and 2.0V (VIH) typical — that is a 1.2V noise margin at 3.3V. If your clock source swings rail-to-rail 3.3V, the input stage sees clean logic levels. A 1.8V or 2.5V clock source will not meet the VIH threshold without external biasing.
Active production and sourcing posture
Renesas continues to manufacture the 74FCT series, and this part is ROHS3 compliant. For BOM planning, this means no forced redesign for obsolescence in the near term.
What the 100 MHz and 1:10 ratio mean for your timing budget
At 100 MHz the period is 10 ns. The non-differential input and output (No/No) means this is a single-ended clock distribution part.