800 MHz fanout buffer with dual 1:4 trees
The CDCLVD2104RHDT from Texas Instruments is a dual fanout buffer that takes one input — LVCMOS, LVDS, or LVPECL — and distributes it to four LVDS outputs per circuit, with two independent circuits on the die. That means you can feed two separate clock domains from a single device, each getting a clean 1:4 split at up to 800 MHz. The differential input and output path is fully differential throughout, so common-mode noise on the clock line gets rejected rather than passed downstream.
Input flexibility saves a level translator
The input stage accepts LVCMOS single-ended signals as well as LVDS and LVPECL differential pairs. If your upstream oscillator or PLL puts out a 2.5V LVCMOS clock, you can feed it directly without an external level shifter — just one AC-coupling cap if the source is differential. The output is always LVDS, which is the standard for driving long PCB traces or backplane clock lines with low swing and good noise margin.
Industrial temperature range for outdoor and factory gear
Rated from -40°C to 85°C, this buffer fits telecom base stations, outdoor small cells, and industrial motor drives that see seasonal temperature swings. The 2.375 V to 2.625 V supply rail is tight — 2.5 V nominal — so make sure your regulator holds within that window across load and temperature; a 3.3 V rail needs a separate 2.5 V LDO.
Package and layout: 28-VQFN with exposed pad
The 28-VQFN (5x5 mm) package has an exposed thermal pad that must be soldered to a ground plane for both electrical return and heat sinking. The pad is the main thermal path — without a via array under it, the junction temperature climbs fast if you run both circuits at full 800 MHz into 50-ohm loads. Keep the decoupling capacitors within 2 mm of the supply pins; the datasheet layout example is worth following closely.
Lifecycle and sourcing
It is RoHS3 compliant.