Hitachi Microdrive 3K8 Quick Installation Manual page 3

Electrical Information
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Power Supply to be 3.3V +5% - 15%, 70mV max ripple, 400mA capable
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Interface Signal Levels
Input High Voltage 2.0 min
Input Low Voltage 0.8 max
Output High Voltage 2.4 max
Output Low Voltage 0.5 min