The maximum clock frequency of the 74HC74BQ,115 is 100 MHz.
To ensure proper initialization, connect the preset (PRE) and clear (CLR) inputs to VCC through a 1 kΩ resistor and a 10 nF capacitor to ground, respectively.
The recommended operating voltage range for the 74HC74BQ,115 is 2.0 V to 5.5 V.
To minimize power consumption, use the lowest possible supply voltage, reduce the clock frequency, and use the power-down mode (if available) when the device is not in use.
The maximum current that the 74HC74BQ,115 can sink or source is 25 mA.
74HC74BQ,115 datasheet
by NXP Semiconductors
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