Seagate 15K.4 Cheetah 15K.4 FC Product Manual - Page 37
Physical/electrical specifications
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6.0 Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of the drive. 6.1 None. AC power requirements 6.2 DC power requirements The voltage and current requirements for a single drive are sh'own below. Values indicated apply at the drive connector. Table 2: DC power requirements for operation in 2Gb mode ST3146854FC Notes (Amps) (Amps) Voltage +5V +12V [2] Regulation [5] ±5% ±5% [2] Avg idle current DCX [1] [7] 0.94 0.78 Maximum starting current (peak DC) DC 3σ [3] 1.07 1.91 (peak AC) AC 3σ [3] 1.36 3.87 Delayed motor start (max) DC 3σ [1] [4] 0.60 0.03 Peak operating current: Typical DCX [1] [6] 1.03 1.18 Maximum DC 3σ [1] 1.04 1.19 Maximum (peak) DC 3s 1.56 2.84 ST373454FC (Amps) (Amps) +5V +12V [2] ±5% ±5% [2] 0.92 0.57 1.08 1.88 1.44 3.98 0.59 0.03 1.01 1.00 1.03 1.02 2.00 2.78 ST336754FC (Amps) (Amps) +5V +12V [2] ±5% ±5% [2] 0.94 0.43 1.08 1.58 1.37 3.30 0.59 0.03 0.99 0.88 1.00 0.88 2.02 2.54 [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 15000 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. [4] This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start Motor command. [5] See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient response. [6] Operating condition is defined as random 8 block reads at 309 I/Os per second for ST3146854FC and Cheetah 15K.4 FC Product Manual, Rev. C 25