The Texas Instruments LMK01000ISQE/NOPB is a 2:8 fanout buffer and divider for high-speed clock distribution, accepting a differential clock input and delivering eight LVDS or LVPECL outputs at up to 1.6 GHz. It operates from a 3.15 V to 3.45 V supply over the industrial temperature range of -40°C to 85°C, making it a fit for telecom infrastructure, base station, and test equipment clock trees where signal integrity and deterministic skew matter. The 2:8 ratio means a single differential clock source can feed eight downstream PLLs, converters, or FPGAs without additional buffering.
The supply range is tighter than a typical 3.3 V ±10% rail — 3.15 V to 3.45 V. That 300 mV window reflects the internal PLL and output driver sensitivity to supply noise. On the board, place a 0.1 µF ceramic within 2 mm of each supply pin and a 10 µF bulk cap near the exposed pad. The 48-WQFN (7x7 mm) exposed pad must be soldered to a ground plane with at least nine thermal vias to keep the junction below 85°C under continuous 1.6 GHz operation.
Differential I/O — why it matters for jitter budget
Both the clock input and all eight outputs are differential (Yes/Yes per the datasheet). That means the part rejects common-mode noise from the supply and ground bounce, which is critical when distributing a low-jitter reference to ADCs or high-speed serial transceivers. If your system uses single-ended clocks, you will need an external balun or a single-ended-to-differential converter ahead of the input.
The base product number LMK01000 covers multiple output options and temperature grades, so if a future design needs a different output standard or package, the family is broad enough to accommodate without a PCB spin.