Conducted Noise Immunity; Power Sequencing - Seagate Constellation ST9500622SS Product Manual

General DC power requirement notes.
1. Minimum current loading for each supply voltage is not less than 1.7% of the maximum operating current
shown.
2. The +5V and +12V supplies should employ separate ground returns.
3. Where power is provided to multiple drives from a common supply, careful consideration for individual
drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak
starting current must be available to each device.
4. Parameters, other than spindle start, are measured after a 10-minute warm up.
5. No terminator power.
7.3.1

Conducted noise immunity

Noise is specified as a periodic and random distribution of frequencies covering a defined frequency range.
Maximum allowed noise values given below are peak-to-peak measurements and apply at the drive power
connector.
+5v = 250mVpp from 100Hz to 20MHz.
+12v = 450mVpp from 100Hz to 100KHz.
250mVpp from 100KHz to 20MHz.
150mVpp from 20MHz to 100MHz.
7.3.2

Power sequencing

The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
26 Constellation.2 SAS Product Manual, Rev. H