Seagate ST373405LW Product Manual - Page 31
Physical/electrical specifications
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Cheetah 73LP Product Manual, Rev. C 21 6.0 Physical/electrical specifications This section provides information relating to the physical and electrical characteristics of the Cheetah 73LP drive. 6.1 None. AC power requirements 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 2: DC power requirements ST373405 ST336605 Notes SE mode LVD mode SE mode LVD mode Voltage +5 V Regulation [5] ±5% Average idle current DC X [1][7] 0.68 Maximum starting current (peak DC) DC 3σ [3] 0.72 (peak AC) AC 3σ [3] 0.88 Delayed motor start (max) DC 3σ [1][4] 0.58 Peak operating current DC Maximum DC Maximum (peak) DC X [1][6] 0.71 3σ [1] 0.75 3σ 1.13 +12 V +5 V ±5%[2] ±5% 0.54 0.74 2.21 0.80 3.40 0.95 0.03 0.64 0.91 0.82 0.95 0.86 2.40 1.42 +12 V +5 V ±5%[2] ±5% 0.54 0.68 2.21 0.74 3.40 0.90 0.03 0.56 0.91 0.73 0.95 0.75 2.40 1.17 +12 V +5 V ±5%[2] ±5% 0.43 0.75 1.84 0.80 2.84 0.99 0.04 0.62 0.82 0.82 0.95 0.84 2.35 1.47 +12 V ±5% [2] 0.43 1.84 2.84 0.04 0.82 0.95 2.35 [1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks will exceed these values. Power supply at nominal voltage. N = 6, 22 Degrees C ambient. [2] For +12 V, a -10% tolerance is permissible during initial start of spindle, and must return to ±5% before 10,017 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 3. [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 200 I/Os per second. Current and power speci- fied at nominal voltages. Increasing +5 volts by +5% increases 5 volt current by