Electrical description, Pin descriptions | Seagate ST3450856SS

9.4.4Electrical description

SAS drives use the device connector for:

•DC power

•SAS interface

•Activity LED

This connector is designed to either plug directly into a backpanel or accept cables.

9.4.5Pin descriptions

This section provides a pin-out of the SAS device and a description of the functions provided by the pins.

Table 12: SAS pin descriptions

Pin	Signal name	Signal type


S1	Port A Ground

S2*	+Port A_in	Diff. input pair

S3*	-Port A_in

S4	Port A Ground

S5*	-Port A_out	Diff output pair

S6*	+Port A_out

S7	Port A Ground

S8	Port B Ground

S9*	+Port B_in	Diff. input pair

S10*	-Port B_in

S11	Port A Ground

S12*	-Port B_out	Diff output pair

S13*	+Port B_out

S14	Port B Ground

*- Short pin to support hot plugging NC - No connection in the drive.

Pin	Signal name	Signal type


P1*	NC (reserved 3.3Volts)

P2*	NC (reserved 3.3Volts)

P3	NC (reserved 3.3Volts)

P4	Ground

P5	Ground

P6	Ground

P7	5 Volts charge

P8*	5 Volts

P9*	5 Volts

P10	Ground

P11*	Ready LED	Open collector out

P12	Ground

P13	12 Volts charge

P14*	12 Volts

P15*	12 Volts

62	Cheetah 15K.6 SAS Product Manual, Rev. A

Image 68

Seagate ST3450856SS manual Electrical description, Pin descriptions, SAS pin descriptions, Pin Signal name Signal type

Contents

Cheetah 15K.6 SAS ST3450856SS ST3300656SS ST3146356SSPage Contents Defect and error management InstallationSeagate Technology support services Interface requirements List of Figures Cheetah 15K.6 SAS disk drive Cheetah 15K.6 SAS Product Manual, Rev. a Scope Cheetah 15K.6 SAS disk drive Cheetah 15K.6 SAS Product Manual, Rev. a Standards, compliance and reference documents StandardsElectromagnetic compatibility Electromagnetic susceptibility Compliance European Union Restriction of Hazardous Substances RoHS Reference documents Cheetah 15K.6 SAS Product Manual, Rev. a General description Performance Standard featuresMedia description Factory-installed accessories Options factory installedReliability Formatted capacities Cheetah 15K.6 SAS Product Manual, Rev. a Performance characteristics Internal drive characteristicsAccess time Seek time Start/stop time Format command execution time minutesGeneral performance characteristics Prefetch/multi-segmented cache control Cache operation Caching write data Prefetch operation Reliability specifications Error ratesRecoverable Errors Unrecoverable Errors Reliability and service Seek errorsInterface errors Preventive maintenance 4 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Milliseconds Reporting control Determining ratePredictive failures Thermal monitor Temperature Log Page 0Dh Primary TemperatureReference Temperature Parameter Code Description State of the drive prior to testing Invoking DSTShort and extended tests Short test Function Code 001b Product warranty AbortShipping Product repair and return information Cheetah 15K.6 SAS Product Manual, Rev. a Physical/electrical specifications AC power requirementsDC power requirements ST3450856SS DC power requirements ST3300656SS DC power requirements ST3146356SS DC power requirementsST3300656SS Gbit mode Amps ST3146356SS Gbit mode Amps General DC power requirement notes Power sequencingConducted noise immunity Current profiles Typical ST3450856SS current profiles Typical ST3300656SS current profiles Typical ST3146356SS current profiles Power dissipation ST3450856SS in 3 Gbit operation ST3300656SS CURRENT/POWER vs Throughput SAS 3.0GB ST3300656SS in 3 Gbit operation Random 8 Block Reads ST3146356SS CURRENT/POWER vs Throughput SAS 3.0GBST3146356SS in 3 Gbit operation Temperature Environmental limits Relative humidity Effective altitude sea levelShock and vibration Shock Package size Packaged/product weight Drop height Recommended mounting Air cleanliness VibrationAcoustics Corrosive environment Mechanical specifications Physical dimensions Cheetah 15K.6 SAS Product Manual, Rev. a Drive error recovery procedures Defect and error managementDrive internal defects/errors 51.87 Media Pre-Scan SAS system errorsBackground Media Scan Deferred Auto-Reallocation Idle Read After Write Installation Drive orientation Cooling Air flow Drive mounting Grounding Cheetah 15K.6 SAS Product Manual, Rev. a SAS features Interface requirements Dual port support Command name Command code Supported Scsi commands supportedCommands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Commands supported by Cheetah 15K.6 SAS family drives Bytes Data hex Mode Sense dataInquiry data Page 2.1 ST3450856SS Mode Sense data Mode Pages 2.2 ST3300656SS Mode Sense data 2.3 ST3146356SS Mode Sense data Miscellaneous operating features and conditions Miscellaneous featuresSupported Feature or condition Miscellaneous status SAS physical interface Datum B Physical characteristics Connector requirements Pin Signal name Signal type Electrical descriptionPin descriptions SAS pin descriptions Signal characteristics PowerSAS transmitters and receivers Ready LED Out LED drive signal Differential signalsGeneral interface characteristics Eye masks Eye masks overview Receive eye mask Jitter tolerance masksAbsolute amplitude Normalized time in UI Peak-to SinusoidalJitter Frequency in kHz Transmitter signal characteristics Signal characteristica Units Gbps Receiver signal characteristics Signal characteristic Units GbpsMaximum allowable jitter Gbps m, n Deterministic jitterq Impedance specifications Receiver jitter toleranceCompliant jitter test pattern Cjtpat Impedance requirements Sheet 1 Electrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Shows the zero-length test load Receiver characteristics Cheetah 15K.6 SAS Product Manual, Rev. a Seagate Technology support services InternetPresales Support Technical Support Data Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index NumericsPage SAS See also cooling