Seagate ST3450802SS ユーザーズマニュアル

Cheetah NS 10K.2 SAS Product Manual, Rev. C

19

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

None.

The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive 
connector. 

[1]

Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous +12V current 
peaks will exceed these values. Power supply at nominal voltage. N (number of drives tested) = 6, 35 
Degrees C ambient.

[2]

For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 
10,000 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been 
completed and that the drive is able to accept selection by the host initiator. 

[3]

See +12V current profile in Figure 1.

[4]

This condition occurs after OOB and Speed Negotiation completes but before the drive has received the 
Notify Spinup primitive.

[5]

See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and 

Voltage

+5V

+12V [2]

+5V

+12V [2]

+5V

+12V [2]

Regulation

[5]

±5%

±5% [2]

±5%

±5% [2]

±5%

±5% [2]

Avg idle current DCX

[1] [6]

0.35

0.37

0.38

0.36

0.32

0.35

Maximum starting current

(peak DC) DC

3

σ

0.48

1.81

0.60

1.81

0.48

1.80

(peak AC) AC

3

σ

0.82

3.60

1.02

3.60

0.84

3.71

Delayed motor start (max) DC

3

σ

0.43

0.04

0.46

0.04

0.45

0.04

Peak operating current:

     Typical DCX

0.38

0.66

0.39

0.65

0.42

0.66

     Maximum DC

3

σ

0.38

0.68

0.40

0.66

0.43

0.67

     Maximum (peak) DC

3

σ

1.00

2.50

1.02

2.58

1.06

2.46