12:1 clock mux — what it does on your board
The Renesas 850S1201BGILFT is a single-circuit 12:1 clock multiplexer that routes one of twelve LVCMOS or LVTTL clock inputs to a single LVCMOS/LVTTL output. It handles clock rates up to 250 MHz, so it fits systems where a processor, FPGA, or SerDes needs to select among multiple reference clocks — say, a base frequency for normal operation and a lower-speed fallback for debug or power-save mode. The 12:1 ratio means you can park a dozen crystal oscillators or PLL outputs on the inputs and switch between them without external mux logic.
Supply range and temperature — where it lives
Supply voltage spans 2.375 V to 3.465 V.
Renesas lists the 850S1201BGILFT as Active and ROHS3 compliant. You can drop it into a new BOM today and expect it to be there for the production run. ROHS3 means it meets the current exemption list — no special paperwork for EU-bound equipment.