Maxim provides a recommended PCB layout in the datasheet, but it's also important to follow general high-frequency design guidelines, such as keeping the signal traces short and away from noise sources, using a solid ground plane, and minimizing vias and layer changes.
To ensure accurate clock output frequency, make sure to follow the recommended crystal oscillator circuit configuration, use a high-quality crystal, and ensure that the PCB layout is optimized for minimal noise and signal distortion.
The DS1091LUA-027+ is rated for operation from -40°C to +85°C, but it's essential to consider the specific application's temperature requirements and ensure that the device is properly derated for temperature extremes.
To troubleshoot issues with the clock output signal, use an oscilloscope to verify the signal frequency, amplitude, and waveform. Check the power supply voltage, crystal oscillator circuit, and PCB layout for any signs of noise or signal distortion.
The DS1091LUA-027+ is not specifically designed for radiation-hardened applications. If your application requires radiation hardness, you should consider using a device specifically designed for that purpose.