1.296 GHz clock distribution — what the fanout buys you
The LMK03000CISQX/NOPB is a clock conditioner from Texas Instruments that takes one input — LVCMOS, LVDS, or LVPECL — and delivers eight identical outputs in LVDS or LVPECL at up to 1.296 GHz. No internal PLL means this is a clean distribution and signal-conditioning part, not a synthesizer; the output edges track the input jitter without adding phase-noise multiplication from a loop filter.
Supply rail tolerance — 3.3 V only, no margin games
The supply range is 3.15 V to 3.45 V — a tight window centred on 3.3 V. A 3.0 V rail or a 3.6 V rail is outside the operating envelope. If your board runs a 3.3 V bus with ±5 % regulation, you are inside the window; a 3.3 V rail that droops to 3.1 V under load still meets the lower bound. Plan the local decoupling accordingly — the 48-WFQFN exposed pad needs a solid ground-plane return for the high-speed outputs.