Seagate Understanding the DC Power Requirements for ST3146755SS

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Table 3:	ST3146755SS DC power requirements

								ST3146755SS		ST3146755SS
								1.5 Gbit mode		3 Gbit mode

							Notes	(Amps)	(Amps)	(Amps)	(Amps)

Voltage								+5V	+12V [2]	+5V	+12V [2]

Regulation							[5]	±5%	±5% [2]	±5%	±5% [2]

							[1] [6]	0.80	0.57	0.78	0.57
Avg idle current DCX							[1] [6]	0.80	0.57	0.78	0.57
Maximum starting current
Maximum starting current
(peak DC) DC						3σ	[3]	0.87	2.12	0.87	1.93
(peak AC) AC						3σ	[3]	1.20	3.49	1.21	3.45

Delayed motor start (max) DC						3σ	[1] [4]	0.64	0.03	0.68	0.03
Peak operating current:
Peak operating current:
							[1]	0.78	0.76	0.81	0.76
Typical DCX							[1]	0.78	0.76	0.81	0.76
Maximum DC						3σ	[1]	0.78	0.78	0.82	0.78
Maximum (peak) DC						3σ		1.60	2.54	1.62	2.62

0.15A DC and 0.2A AC 12V max start current margin added..

Table 4:	ST373355SS DC power requirements

								ST373355SS		ST373355SS
								1.5 Gbit mode		3 Gbit mode

							Notes	(Amps)	(Amps)	(Amps)	(Amps)

Voltage								+5V	+12V [2]	+5V	+12V [2]

Regulation							[5]	±5%	±5% [2]	±5%	±5% [2]

							[1] [6]	0.78	0.44	0.77	0.44
Avg idle current DCX							[1] [6]	0.78	0.44	0.77	0.44
Maximum starting current
Maximum starting current
(peak DC) DC						3σ	[3]	0.84	1.91	0.84	1.91
(peak AC) AC						3σ	[3]	1.18	3.17	1.12	3.23

Delayed motor start (max) DC						3σ	[1] [4]	0.66	0.03	0.66	0.03
Peak operating current:
Peak operating current:
							[1]	0.75	0.64	0.78	0.63
Typical DCX							[1]	0.75	0.64	0.78	0.63
Maximum DC						3σ	[1]	0.77	0.65	0.80	0.66
Maximum (peak) DC						3σ		1.50	2.32	1.54	2.32

0.15A DC and 0.2A AC 12V max start current margin added.

[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

24	Cheetah T10 SAS Product Manual, Rev. A

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Contents Cheetah T10 SAS Page Contents Seagate Technology support services Defect and error managementInstallation Interface requirementsList of Figures Cheetah T10 SAS Product Manual, Rev. a Scope Cheetah T10 SAS disc driveCheetah T10 SAS Product Manual, Rev. a Electromagnetic compatibility Standards, compliance and reference documentsStandards Electromagnetic susceptibilityCompliance Reference documents Cheetah T10 SAS Product Manual, Rev. a General description Standard features Media descriptionPerformance Formatted capacities Factory-installed accessoriesReliability Programmable drive capacityOptions factory installed User-installed accessoriesAccess time Performance characteristicsInternal drive characteristics Seek timeFormat command execution time minutes General performance characteristicsStart/stop time Prefetch/multi-segmented cache control Cache operationCaching write data Prefetch operationRecoverable Errors Reliability specificationsError rates Unrecoverable ErrorsInterface errors Reliability and serviceSeek errors Preventive maintenanceControlling S.M.A.R.T Hot plugging the drive4 S.M.A.R.T Performance impactPredictive failures Reporting controlDetermining rate Thermal monitorReference Temperature Temperature Log Page 0DhPrimary Temperature Parameter Code DescriptionShort and extended tests State of the drive prior to testingInvoking DST Short test Function Code 001b Shipping Product warranty Abort Product repair and return informationCheetah T10 SAS Product Manual, Rev. a DC power requirements Physical/electrical specificationsAC power requirements ST3300555SS DC power requirementsST3146755SS Gbit mode Amps ST3146755SS DC power requirementsST373355SS DC power requirements ST373355SS Gbit mode AmpsConducted noise immunity General DC power requirement notesPower sequencing Current profilesTypical ST3300555SS drive current profiles Typical ST3146755SS drive current profiles Typical ST373355SS drive current profiles Power dissipation ST3300555SS in 3 Gbit operationST3300555SS in 1.5 Gbit operation ST3146755SS in 3 Gbit operation ST3146755SS in 1.5 Gbit operationST373355SS in 3 Gbit operation ST373355SS in 1.5 Gbit operationTemperature a. Operating Environmental limitsShock and vibration Relative humidityEffective altitude sea level a. Operating ShockPackage size Packaged/product weight Drop height Recommended mountingAir cleanliness Vibration a. Operating-normalCorrosive environment Mechanical specifications AcousticsDefect and error management Drive internal defects/errorsDrive error recovery procedures Write retry count LBA cumulative, msec SAS system errors Background Media ScanMedia Pre-Scan Deferred Auto-Reallocation Idle Read After WriteInstallation Drive orientationCooling Air flowDrive mounting GroundingCheetah T10 SAS Product Manual, Rev. a SAS features Interface requirementsDual port support Scsi commands supported Commands supported by Cheetah T10 SAS family drivesCommand name Command code Supported Commands supported by Cheetah T10 SAS family drives Commands supported by Cheetah T10 SAS family drives Commands supported by Cheetah T10 SAS family drives Cheetah T10 SAS inquiry data Mode Sense dataInquiry data Bytes Data hexPage ST3300555SS Mode Sense data Mode PagesST3146755SS Mode Sense data ST373355SS Mode Sense data Supported Feature or condition Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous statusSAS physical interface Datum B Physical characteristics Connector requirementsPin descriptions Pin Signal name Signal typeElectrical description SAS pin descriptionsSAS transmitters and receivers Signal characteristicsPower Ready LED OutGeneral interface characteristics LED drive signalDifferential signals Eye masks Eye masks overviewAbsolute amplitude Receive eye maskJitter tolerance masks Normalized time in UIJitter Peak-toSinusoidal Frequency in kHzTransmitter signal characteristics Signal characteristica Units GbpsMaximum allowable jitter Receiver signal characteristicsSignal characteristic Units Gbps Gbps m, n Deterministic jitterqCompliant jitter test pattern Cjtpat Impedance specificationsReceiver jitter tolerance Impedance requirements Sheet 1Transmitter characteristics Impedance requirements Sheet 2Electrical TxRx connections = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah T10 SAS Product Manual, Rev. a Internet MySeagate Spp.seagate.com Seagate Technology support servicesWarranty Service Presales SupportData Recovery Services Authorized Service Centers Data Recovery ServicesFAX services-All Europe toll call Call center Presales and Technical Support Warranty ServiceToll-free support numbers Africa/Middle East support services Index NumericsPage SAS See also cooling Page Seagate Technology LLC