350 MHz fanout buffer for automotive clock trees
The LMK00804BQWRGTTQ1 is a 2:4 fanout buffer — two input channels each distribute to two outputs, giving four LVCMOS/LVTTL outputs from differential or single-ended sources. The 350 MHz maximum frequency sets the ceiling for clock distribution; at that rate the output rise time into the load capacitance, not the buffer itself, limits the usable fan-out in a real PCB trace. Input compatibility spans HCSL, LVCMOS, LVDS, LVHSTL, LVPECL, LVTTL, and SSTL — this covers the common clock sources from PCIe reference oscillators to FPGA differential outputs.
AEC-Q100 Grade 1 — the temperature band for under-hood and engine bay
The 125°C upper limit aligns with under-hood and engine-bay environments where a 105°C summer soak still leaves margin.
Package footprint and thermal pad design rule
Housed in a 16-VFQFN with exposed pad, 3x3 mm body (supplier device package 16-VQFN). The wettable flank option aids AOI inspection after reflow — the side solder fillet is visible to the camera, which standard QFN side-wall plating does not guarantee. The exposed pad must be soldered to the PCB ground plane to achieve the datasheet thermal resistance; a 3x3 mm pad with at least nine thermal vias under the die attach area is the typical layout rule.