Seagate ST373207LC Cheetah 10K.7 SCSI Product Manual - Page 36

Notes, SE mode, LVD mode

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Voltage Regulation Average idle current DC X Maximum starting current (peak DC) DC 3σ (peak AC) AC 3σ Delayed motor start (max) DC 3σ Peak operating current DC X Maximum DC 3σ Maximum (peak) DC 3σ Notes [5] [1][7] [3] [3] [1] [4] [1] [6] [1] ST3146707 SE mode LVD mode +5 V ±5% 0.54 +12 V ±5% [2] 0.42 +5 V ±5% 0.54 +12 V ±5% [2] 0.42 0.77 1.89 1.09 3.66 0.54 0.06 0.76 1.89 1.06 3.83 0.54 0.06 0.60 0.81 0.62 0.83 1.52 2.50 0.61 0.83 0.63 0.85 1.44 2.48 Voltage Regulation Average idle current DC X Maximum starting current (peak DC) DC 3σ (peak AC) AC 3σ Delayed motor start (max) DC 3σ Peak operating current DC X Maximum DC 3σ Maximum (peak) DC 3σ Notes [5] [1][7] [3] [3] [1] [4] [1] [6] [1] ST373207 SE mode LVD mode +5 V ±5% 0.54 +12 V ±5% [2] 0.34 +5 V ±5% 0.54 +12 V ±5% [2] 0.34 0.76 1.55 1.08 3.04 0.54 0.06 0.77 1.56 1.03 3.36 0.54 0.06 0.62 0.73 0.63 0.76 1.56 2.46 0.60 0.72 0.61 0.74 1.48 2.40 [1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks will exceed these values. Power supply at nominal voltage. 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 10,000 rpm is reached. 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 +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. [5] See Section 6.2.1 "Conducted Noise Immunity." Specified voltage tolerance is inclusive of ripple, noise, and transient response. [6] Operating condition is defined as random 8 block reads at: 257 I/Os per second (ST3300007) LVD 257 I/Os per second (ST3146707) LVD 256 I/Os per second (ST373207) LVD Current and power specified at nominal voltages. Decreasing +5 volts by 5% increases 5 volt current by

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26
Cheetah 10K.7 SCSI Product Manual, Rev. D
[1]
Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks
will exceed these values. Power supply at nominal voltage. 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
10,000 rpm is reached. 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 +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.
[5]
See Section 6.2.1 “Conducted Noise Immunity.” Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
[6]
Operating condition is defined as random 8 block reads at:
257 I/Os per second (ST3300007) LVD
257 I/Os per second (ST3146707) LVD
256 I/Os per second (ST373207) LVD
Current and power specified at nominal voltages. Decreasing +5 volts by 5% increases 5 volt current by
<0.5%. Decreasing +12 volt supply by 5% increases 12 volt current by 1.4% (2% for ST3146707 and
ST373207 models).
[7]
During idle, the drive heads are relocated every 60 seconds to a random location within the band from
Notes
ST3146707
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]
0.54
0.42
0.54
0.42
Maximum starting current
(peak DC) DC
3
σ
(peak AC) AC
3
σ
[3]
[3]
0.77
1.09
1.89
3.66
0.76
1.06
1.89
3.83
Delayed motor start (max) DC
3
σ
[1][4]
0.54
0.06
0.54
0.06
Peak operating current
DC
X
Maximum DC
3
σ
Maximum (peak) DC
3
σ
[1][6]
[1]
0.60
0.62
1.52
0.81
0.83
2.50
0.61
0.63
1.44
0.83
0.85
2.48
Notes
ST373207
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]
0.54
0.34
0.54
0.34
Maximum starting current
(peak DC) DC
3
σ
(peak AC) AC
3
σ
[3]
[3]
0.76
1.08
1.55
3.04
0.77
1.03
1.56
3.36
Delayed motor start (max) DC
3
σ
[1][4]
0.54
0.06
0.54
0.06
Peak operating current
DC
X
Maximum DC
3
σ
Maximum (peak) DC
3
σ
[1][6]
[1]
0.62
0.63
1.56
0.73
0.76
2.46
0.60
0.61
1.48
0.72
0.74
2.40