400 MHz clock source — supply and temperature envelope
The LMK60E0-156M25SIAT: It draws 95 mA from a 3.135 V to 3.465 V rail — the tight 3.3 V ±5 % tolerance means this part expects a regulated supply, not a raw battery or bus voltage. The 6-QFM (7x5) package footprint is 7 mm × 5 mm, a common land pattern for high-frequency oscillators.