Physical/Electrical Specifications; Ac Power Requirements; Dc Power Requirements - Seagate ST373453LC - Cheetah 73.4 GB Hard Drive Product Manual

Cheetah 15K.3 SCSI Product Manual, Rev. G
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
Voltage
Regulation
Average idle current DC
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
Peak operating current
DC
Maximum DC
Maximum (peak) DC
Voltage
Regulation
Average idle current DC
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
Peak operating current
DC
Maximum DC
Maximum (peak) DC
[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.
ST373453
Notes SE mode
+5 V +12 V
[5] ±5% ±5%[2] ±5% ±5%[2] ±5% ±5%[2] ±5% ±5%[2]
X [1][7] 0.81 0.68
[3] 0.99 1.93
3σ
[3] 1.42 3.96
3σ
[1][4] 0.82 0.04
3σ
X [1][6] 0.92 1.15
[1] 0.96 1.21
3σ
1.85 2.69
3σ
ST318453
Notes
SE mode
+5 V +12 V
[5] ±5% ±5%[2] ±5% ±5%[2]
X [1][7] 0.81 0.42
[3] 0.87 1.49
3σ
[3] 1.29 3.19
3σ
[1][4] 0.82 0.04
3σ
X [1][6] 0.92 0.86
[1] 0.96 0.91
3σ
1.85 2.28
3σ
LVD mode SE mode
+5 V +12 V +5 V +12 V
0.86 0.68 0.81 0.52
1.04 1.93 0.95 1.50
1.53 3.96 1.42 3.12
0.88 0.04 0.82 0.04
1.02 1.15 0.92 0.97
1.08 1.21 0.96 1.01
2.15 2.69 1.85 2.44
LVD mode
+5 V +12 V
0.86 0.42
0.93 1.49
1.53 3.19
0.88 0.04
1.02 0.86
1.08 0.91
2.15 2.28
21
ST336753
LVD mode
+5 V +12 V
0.86 0.52
1.01 1.50
1.53 3.12
0.88 0.04
1.02 0.97
1.08 1.01
2.15 2.44