Seagate ST3300457FC Cheetah 15K.7 FC Product Manual - Page 30
Conducted noise immunity, Power sequencing, Current profiles
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7.2.1 Conducted noise immunity Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz. Maximum allowed noise values given below are peak-to-peak measurements and apply at the drive power connector. +5 V = +12 V = 250 mV pp from 0 to 20 MHz. 800 mV pp from 100 Hz to 8 KHz. 450 mV pp from 8 KHz to 20 KHz. 250 mV pp from 20 KHz to 5 MHz. 7.2.2 Power sequencing The drive does not require power sequencing. The drive protects against inadvertent writing during power-up and down. 7.2.3 Current profiles The +12V and +5V current profiles are shown in the following figures. Note: All times and currents are typical. See Section 7.2 for maximum current requirements. Figure 1. Typical ST3600057FC current profiles 24 Cheetah 15K.7 FC Product Manual, Rev. C