Seagate ST336754SS Cheetah 15K.4 SAS Product Manual - Page 36
Table 3, DC power requirements, Table 4
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Table 3: ST373454SS DC power requirements ST373454SS 3 Gbit mode Notes (Amps) (Amps) Voltage +5V Regulation [5] ±5% Avg idle current DCX [1] [7] 1.02 Maximum starting current (peak DC) DC 3σ [3] 1.20 (peak AC) AC 3σ [3] 1.62 Delayed motor start (max) DC 3σ [1] [4] 1.03 Peak operating current: Typical DCX [1] [6] 1.12 Maximum DC 3σ [1] 1.13 Maximum (peak) DC 3s 1.64 +12V [2] ±5% [2] 0.56 1.76 3.79 0.04 0.95 0.96 2.70 ST373454SS 1.5 Gbit mode (Amps) (Amps) +5V +12V [2] ±5% ±5% [2] 1.07 0.56 1.21 1.78 1.56 3.87 0.91 0.04 1.00 0.94 1.02 0.96 1.52 2.74 Table 4: ST336754SSDC power requirements ST336754SS 3 Gbit mode Notes (Amps) (Amps) Voltage +5V +12V [2] Regulation [5] ±5% ±5% [2] Avg idle current DCX [1] [7] 1.01 0.44 Maximum starting current (peak DC) DC 3σ [3] 1.17 1.58 (peak AC) AC 3σ [3] 1.65 3.43 Delayed motor start (max) DC 3σ [1] [4] 1.02 0.04 Peak operating current: ST336754SS 1.5 Gbit mode (Amps) (Amps) +5V +12V [2] ±5% ±5% [2] 1.07 0.44 1.20 1.59 1.52 3.39 0.91 0.04 Typical DCX [1] [6] 1.12 0.83 1.01 0.83 Maximum DC 3σ [1] 1.14 0.85 1.02 0.85 Maximum (peak) DC 3s 1.64 2.56 1.52 2.58 [1] Measured with average reading DC ammeter. 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 14,904 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 2. 26 Cheetah 15K.4 SAS Product Manual, Rev. B