1.71 V to 1.89 V supply — plan the rail
The supply window is narrow: 1.71 V to 1.89 V. The 1:3 input-to-output ratio means one crystal or reference clock fans out to three LVCMOS loads, saving a separate fanout buffer.
100 MHz max — what it means for bus timing
The 100 MHz ceiling covers most Ethernet MAC/PHY reference clocks, MCU external oscillators, and FPGA configuration clocks. The integrated PLL (Yes) multiplies the input crystal frequency up to the output, so you can use a lower-cost fundamental crystal rather than a higher-frequency oscillator.
LVCMOS output — interface compatibility
All three outputs are LVCMOS, not LVPECL or LVDS. That's fine for driving clock inputs on standard CMOS logic, FPGAs, and most MCUs. If you need differential signalling for a SerDes reference or a high-speed ADC, you'll need a translator or a different clock generator. The outputs are non-differential (No/No on the differential input/output flag), so keep trace lengths short and use series termination to avoid reflections on the 100 MHz edge.
Active production — no LTB worry
Renesas lists the 5X1503-000NLGI8 as Active. There is no last-time-buy notice or NRND flag. No need to stockpile for an EOL — but as always, keep an eye on Renesas PCNs for any future changes.