Seagate ST3300457FC Cheetah 15K.7 SAS Product Manual - Page 29

Notify Spinup primitive.

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Table 15: 300 GB DC power requirements Voltage Regulation 3 Gbit mode Notes (Amps) (Amps) +5V +12V [2] [5] ±5% ±5% [2] Avg idle current Maximum starting current (peak DC) DC (peak AC) AC Delayed motor start (max) DC Peak operating current (random read): Typical DC Maximum DC Maximum DC (peak) Peak operating current (random write): Typical DC Maximum DC Maximum DC (peak) Peak operating current (sequential read): [1] [7] 0.34 0.58 3σ [3] 0.53 1.92 3σ [3] 0.98 3.82 3σ [1] [4] 0.47 0.04 [1][6] [1] 0.41 0.88 3σ [1] 0.42 0.95 3σ 1.18 2.78 [1][6] [1] 0.48 0.80 3σ [1] 0.49 0.83 3σ 1.18 2.68 Typical DC Maximum DC Maximum DC (peak) Peak operating current (sequential write): [1][6] [1] 0.91 0.59 3σ [1] 0.93 0.60 3σ 1.20 0.98 Typical DC Maximum DC Maximum DC (peak) [1][6] [1] 0.89 0.58 3σ [1] 0.93 0.60 3σ 1.22 0.98 6 Gbit mode (Amps) (Amps) +5V +12V [2] ±5% ±5% [2] 0.35 0.58 0.54 1.92 0.86 3.98 0.48 0.04 0.42 0.90 0.43 0.95 1.20 2.74 0.49 0.81 0.51 0.82 1.20 2.66 0.92 0.59 0.94 0.61 1.24 1.00 0.90 0.59 0.94 0.60 1.22 0.96 [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 15,000 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 7.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient response. Cheetah 15K.7 SAS Product Manual, Rev. C 23

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Cheetah 15K.7 SAS Product Manual, Rev. C
23
[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
15,000 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 7.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
Table 15:
300 GB
DC power requirements
Notes
3 Gbit mode
6 Gbit mode
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [2]
+5V
+12V [2]
Regulation
[5]
±5%
±5% [2]
±5%
±5% [2]
Avg idle current
[1] [7]
0.34
0.58
0.35
0.58
Maximum starting current
(peak DC) DC
3
σ
[3]
0.53
1.92
0.54
1.92
(peak AC) AC
3
σ
[3]
0.98
3.82
0.86
3.98
Delayed motor start (max) DC
3
σ
[1] [4]
0.47
0.04
0.48
0.04
Peak operating current (random read):
Typical DC
[1][6]
[1]
0.41
0.88
0.42
0.90
Maximum DC
3
σ
[1]
0.42
0.95
0.43
0.95
Maximum DC (peak)
3
σ
1.18
2.78
1.20
2.74
Peak operating current (random write):
Typical DC
[1][6]
[1]
0.48
0.80
0.49
0.81
Maximum DC
3
σ
[1]
0.49
0.83
0.51
0.82
Maximum DC (peak)
3
σ
1.18
2.68
1.20
2.66
Peak operating current (sequential read):
Typical DC
[1][6]
[1]
0.91
0.59
0.92
0.59
Maximum DC
3
σ
[1]
0.93
0.60
0.94
0.61
Maximum DC (peak)
3
σ
1.20
0.98
1.24
1.00
Peak operating current (sequential write):
Typical DC
[1][6]
[1]
0.89
0.58
0.90
0.59
Maximum DC
3
σ
[1]
0.93
0.60
0.94
0.60
Maximum DC (peak)
3
σ
1.22
0.98
1.22
0.96