Seagate ST373454 Manual download pdf (Page 31)

Cheetah 15K.3 SCSI Product Manual, Rev. G 21

6.0 Physical/electrical specifications

This section provides information relating to the physical and electrical characteristics of the Cheetah 15K.3

SCSI drive.

6.1 AC power requirements

None.

6.2 DC power requirements

The voltage and current requirements for a single drive are shown in the following table. Values indicated apply

at the drive power connector. The table shows current values in Amperes.

Table 3: DC power requirements

[1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous 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 permissible during initial start of spindle, and must return to ±5% before

15,000 rpm is reached. The +10% / -7.5% 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 +12 V current profile in Figure 2.

[4] This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start

Motor command.

Notes

ST373453 ST336753

SE mode LVD mode SE mode LVD mode

Voltage +5 V +12 V +5 V +12 V +5 V +12 V +5 V +12 V

Regulation [5] ±5% ±5%[2] ±5% ±5%[2] ±5% ±5%[2] ±5% ±5%[2]

Average idle current DC X [1][7] 0.81 0.68 0.86 0.68 0.81 0.52 0.86 0.52

Maximum starting current

(peak DC) DC

(peak AC) AC

3σ

[3]

0.99

1.42

1.93

3.96

1.04

1.53

1.93

3.96

0.95

1.42

1.50

3.12

1.01

1.53

1.50

3.12

Delayed motor start (max) DC

3σ

[1][4] 0.82 0.04 0.88 0.04 0.82 0.04 0.88 0.04

Peak operating current

Maximum DC

Maximum (peak) DC

3σ

[1][6]

[1]

0.92

0.96

1.85

1.15

1.21

2.69

1.02

1.08

2.15

1.15

1.21

2.69

0.92

0.96

1.85

0.97

1.01

2.44

1.02

1.08

2.15

0.97

1.01

2.44

Notes

ST318453

SE mode LVD mode

Voltage +5 V +12 V +5 V +12 V

Regulation [5] ±5% ±5%[2] ±5% ±5%[2]

Average idle current DC X [1][7] 0.81 0.42 0.86 0.42

Maximum starting current

(peak DC) DC

(peak AC) AC

3σ

[3]

0.87

1.29

1.49

3.19

0.93

1.53

1.49

3.19

Delayed motor start (max) DC

3σ

[1][4] 0.82 0.04 0.88 0.04

Peak operating current

Maximum DC

Maximum (peak) DC

3σ

[1][6]

[1]

0.92

0.96

1.85

0.86

0.91

2.28

1.02

1.08

2.15

0.86

0.91

2.28

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