Conducted Noise Immunity; Power Sequencing; Current Profiles - Seagate Cheetah 15K Product Manual
Cheetah 15k.6 sas serial attached scsi disk drives
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6.2.1
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.
+5V
=
250 mV pp from 0 to 100 kHz to 20 MHz.
+12V =
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.
6.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
6.2.3
Current profiles
The +12V and +5V current profiles are shown below in the following figures.
Note: All times and currents are typical. See Tables 12, 14, and 16 for maximum current requirements.
Cheetah 15K.6 SAS Product Manual, Rev. B
27
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