2.1.1 Fan Input VoltageFan operating voltage shall be within the range 12 V ±5% V....2.1.4 PWM Control Input SignalPWM Frequency: Target frequency 25 kHz, acceptable operational range 21 kHz to 28 kHzMaximum voltage for logic low: VIL = 0.8 VAbsolute maximum current sourced: Imax = 5 mA (short circuit current)Absolute maximum voltage level: VMax = 5.25 V (open circuit voltage)This signal must be pulled up to a maximum of 5.25V within the fan.
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