Seagate ST200FM0042, ST100FM0012, ST100FM0052 manual 100GB standard model DC power requirements

Table 12 100GB standard model DC power requirements

PARAMETER				100GB (6.0GB)
Regulation			±5%	±5%
Voltage			+5V	+12V
			CURRENT (A)	CURRENT (A)	POWER (W)
Average idle current		DC	0.43	0.12	3.59
Maximum starting current
	(peak DC) DC	3σ	0.48	0.32
	(peak AC) AC	3σ	1.53	0.61
Delayed start (max) DC		3σ	0.45	0.13	2.38
Peak operating current (random read):
	Typical DC	DC	0.50	0.18	4.66
	Maximum DC	3σ	0.51	0.20	4.95
	Maximum (peak) DC	3σ	0.88	0.47
Peak operating current (random write)
	Typical DC	DC	0.49	0.36	6.77
	Maximum DC	3σ	0.51	0.39	7.23
	Maximum (peak) DC	3σ	0.80	0.89
Peak operating current (sequential read)
	Typical DC	DC	0.56	0.26	5.92
	Maximum DC	3σ	0.59	0.29	6.43
	Maximum (peak) DC	3σ	0.89	0.56
Peak operating current (sequential write)
	Typical DC	DC	0.50	0.35	6.70
	Maximum DC	3σ	0.52	0.38	7.16
	Maximum (peak) DC	3σ	0.83	0.94

[1]Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these values. Power supply at nominal voltage. N (num- ber of drives tested) = 6, 60 Degrees C ambient.

[2]For +12 V, a –10% tolerance is allowed during initial start but must return to ±5% before reaching ready state. 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 6 (for 400GB models) and Figure 7 (for 200GB models).

[4]See +12V current profile in Figure 8 (for 100GB models).

[5]This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify Spinup primitive.

[6]See paragraph 6.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient response.

General DC power requirement notes.

1.Minimum current loading for each supply voltage is not less than 1.7% of the maximum operating current shown.

2.The +5V and +12V supplies should employ separate ground returns.

3.Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device.

4.Parameters, other than start, are measured after a 10-minute warm up.

PULSAR.2 SAS PRODUCT MANUAL, REV. C 23