Would it be okay if the NC (no connect) pin on the XU crystal oscillator series (XUL, XUH, XUN) is connected to GND ?

The NC pin between pins #1 and #3, is a duplicate of the circuitry in pin #1 with a greater than 8 Mega ohm resistance pulled up to 3.3V. The next subsequent stage is isolated with a high impedance so that there is no internal effect or possible damage by connection of either pin #1 or #3 to each other or to ground.

This characteristic is to accommodate similar parts by a competitor who places the Enable-Disable input on pin #2. All complementary output XU configurations (LVDS, LVPECL, & HCSL) have an option for Pin #2 E/D, instead of Pin #1.

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Documents

Title Other Languages Type Format File Size Date
Datasheets & Errata
IDT XO HCMOS Crystal Oscillator Datasheet - XUH Datasheet PDF 297 KB Jun 21, 2017
IDT XO HCSL Crystal Oscillator Datasheet - XUN Datasheet PDF 283 KB Jun 21, 2017
IDT XO LVDS Crystal Oscillator Datasheet - XUL Datasheet PDF 289 KB Jun 21, 2017