Physical/Electrical Specifications; Power Specifications; Conducted Noise Immunity; Power Sequencing - Seagate ST400FM0323 Product Manual

6.0

Physical/electrical specifications

This section provides information relating to the physical and electrical characteristics of the drive.
6.1

Power specifications

The 2.5" drive receives DC power (+5V and +12V) through the standard SAS interface. The minimum current loading for each supply
voltage is not less than 1.7% of the maximum operating current shown. Both +5V and +12V supplies should employ separate ground
returns.
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.
12V Requirements
Supply Tolerance
Absolute Maximum Voltage
Supply Rise Time
Supply Drop Time
Typical Capacitance
5V Requirements
Supply Tolerance
Absolute Maximum Voltage
Supply Rise Time
Supply Drop Time
Typical Capacitance
6.1.1

Conducted noise immunity

Noise is specified as a periodic and random distribution of frequencies covering a defined frequency. Maximum allowed noise values
given below are peak-to-peak measurements and apply at the drive power connector.
+5v = 250 mV pp from 100 Hz to 20 MHz.
+12v = 450 mV pp from 100 Hz to 100 KHz.
250 mV pp from 100 KHz to 20 MHz.
150 mV pp from 20 MHz to 80 MHz.
6.1.2

Power sequencing

The drive does not require power sequencing. The drive protects against inadvertent writing during power-up and down.
Seagate 1200.2 SAS SSD Product Manual, Rev. A
+10% / -7%
15V
0 to 500 ms
0 to 500 ms
21 μf
+10% / -7%
5.5V
0 to 500 ms
0 to 500 ms
74 μf
28