Seagate ST973401SS, ST936701SS manual Impedance requirements Sheet 2, Electrical TxRx connections

Page 74

Table 31: Impedance requirements (Sheet 2 of 2)

Requirement

Units

1.5 Gbps

3.0 Gbps

 

 

 

 

Common mode impedanceb,e

ohm

20 min/40 max

20 min/40 max

Transmitter source termination

 

 

 

 

 

 

 

Differential impedanceb

ohm

60 min/115 max

60 min/115 max

Differential impedance imbalanceb,g

ohm

5

5

Common mode impedanceb

ohm

15 min/40 max

15 min/40 max

aAll times indicated for time domain reflectometer measurements are recorded times. Recorded times are twice the transit time of the time domain reflectometer signal.

bAll measurements are made through mated connector pairs.

cThe media impedance measurement identifies the impedance mismatches present in the media when terminated in its characteristic impedance. This measurement excludes mated connectors at both ends of the media, when present, but includes any intermediate connectors or splices. The mated connectors measurement applies only to the mated connector pair at each end, as applicable.

dWhere the media has an electrical length of > 4 ns the procedure detailed in SFF-8410, or an equivalent procedure, shall be used to determine the impedance.

eThe receiver termination impedance specification applies to all receivers in a TxRx connection and covers all time points between the connector nearest the receiver, the receiver, and the transmission line terminator. This measurement shall be made from that connector.

fAt the time point corresponding to the connection of the receiver to the transmission line the input capacitance of the

receiver and its connection to the transmission line may cause the measured impedance to fall below the minimum impedances specified in this table. The area of the impedance dip (amplitude as ρ, the reflection coefficient, and duration in time) caused by this capacitance is the receiver termination time constant. The receiver time constant

shall not be greater than the values shown in this table. An approximate value for the receiver termination time constant is given by the product of the amplitude of the dip (as ρ) and its width (in ps) measured at the half amplitude point. The amplitude is defined as being the difference in the reflection coefficient between the reflection coefficient at the nominal impedance and the reflection coefficient at the minimum impedance point. The value of the receiver

excess input capacitance is given by the following equation:

receiver termination time constant C = ---------------------------------------------------------------------------------

(R0 RR)

where (R0 RR) is the parallel combination of the transmission line characteristic impedance and termination resistance at the receiver.

gThe difference in measured impedance to ground on the plus and minus terminals on the interconnect, transmitter or receiver, with a differential test signal applied to those terminals.

9.5.2.4Electrical TxRx connections

TxRx connections may be divided into TxRx connection segments. In a single TxRx connection individual TxRx connection segments may be formed from differing media and materials, including traces on printed wir- ing boards and optical fibers. This subclause applies only to TxRx connection segments that are formed from electrically conductive media.

Each electrical TxRx connection segment shall comply with the impedance requirements of table 31 for the media from which they are formed. An equalizer network, if present, shall be part of the TxRx connection.

TxRx connections that are composed entirely of electrically conducting media shall be applied only to homoge- nous ground applications (e.g., between devices within an enclosure or rack, or between enclosures intercon- nected by a common ground return or ground plane).

9.5.2.4.1Transmitter characteristics

The drive are D.C. coupled.

68

Savvio SAS Product Manual, Rev. D

Page 73 Page 75
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Contents Savvio SAS ST973401SS ST936701SSPage Contents Seagate Technology support services Defect and error managementInstallation Interface requirementsList of Figures Page Scope Savvio family disc driveSavvio SAS Product Manual, Rev. D Electromagnetic compatibility Applicable standards and reference documentationStandards Electromagnetic susceptibilityAustralian C-Tick Electromagnetic complianceElectromagnetic compliance for the European Union Korean MICReference documents SAS Interface ManualSavvio SAS Product Manual, Rev. D General description Performance Standard featuresMedia description Formatted capacities Factory-installed accessoriesReliability Programmable drive capacityFactory-installed options User-installed accessoriesSeek performance characteristics Performance characteristicsInternal drive characteristics Access timeFormat command execution time for 512-byte sectors minutes General performance characteristicsCache operation Start/stop timePrefetch/multi-segmented cache control Caching write data Prefetch operation Savvio SAS Product Manual, Rev. D Recoverable 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 monitorDST failure definition Temperature Log Page 0Dh Parameter Code DescriptionDrive Self Test DST ImplementationShort and extended tests State of the drive prior to testingInvoking DST Short test Function Code 001bAbort Product warrantyLog page entries ShippingProduct repair and return information DC power requirements Physical/electrical specificationsAC power requirements ST973401SS DC power requirementsST936701SS Gbit mode Amps ST936701SS DC power requirementsGeneral DC power requirement notes Current profiles Power sequencingConducted noise immunity +5V +12VTypical ST973401SS drive +12V current profile Typical ST936701SS drive +12V current profile ST973401SS in 1.5 Gbit operation Power dissipationST973401SS in 3 Gbit operation ST936701SS in 3 Gbit operation ST936701SS in 1.5 Gbit operationRelative humidity TemperatureEnvironmental limits Shock Effective altitude sea levelShock and vibration Package size Packaged/product weight Drop height Recommended mountingCorrosive environment Air cleanlinessVibration Acoustics Mechanical specifications Mounting configuration dimensionsSavvio SAS Product Manual, Rev. D Drive error recovery procedures Defect and error managementDrive internal defects/errors SAS system errors Installation Drive orientationCooling Air flowDrive mounting GroundingSavvio SAS Product Manual, Rev. D SAS features Interface requirementsDual port support Command name Command code Supported Scsi commands supportedCommands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Commands supported by Savvio SAS family drive Savvio inquiry data Mode Sense dataInquiry data Bytes Data hexPage DEF CHG Savvio SAS Product Manual, Rev. D Supported Feature or condition Miscellaneous operating features and conditionsMiscellaneous features Miscellaneous statusSAS physical interface Datum B Section C C Section a a Electrical description Physical characteristicsConnector requirements Pin descriptionsSAS transmitters and receivers Pin Signal name Signal typeSAS pin descriptions Signal characteristics Eye masks Eye masks overview General interface characteristicsCharacteristic Units Gbps Receive eye maskJitter tolerance masks Reveive tolerance eye maskJitter 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 1Electrical TxRx connections Transmitter characteristicsImpedance requirements Sheet 2 = -5,437dB Tctf Receiver characteristics ISI loss example at 1.5 GbpsSavvio SAS Product Manual, Rev. D Presales Support Seagate Technology support servicesInternet Technical SupportData Recovery Services Call Center Toll-free Direct dial Warranty ServiceData Recovery Services Authorized Service Centers Index NumericsPage SAS See also cooling
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ST936701SS, ST973401SS specifications

The Seagate ST936701SS and ST973401SS are high-performance enterprise hard drives designed for optimal data storage solutions in demanding environments. Both models belong to Seagate's Savvio series, which is renowned for its reliability and efficiency. These drives are tailored for critical applications such as database management, data warehousing, and online transaction processing.

The ST936701SS comes with a storage capacity of 36.4 GB, while the ST973401SS offers a larger capacity of 73.4 GB. This variance allows users to choose the drive that best suits their storage needs without compromising performance. Both drives utilize a 2.5-inch form factor, making them compact and suitable for high-density storage configurations.

A key feature of these drives is their impressive rotational speed of 10,000 RPM, which enhances data access times and improves overall system responsiveness. This speed allows for reduced latency and faster data transfer rates, critical for applications that require quick retrieval of large datasets.

In terms of technology, these drives utilize the Serial Attached SCSI (SAS) interface, which is favored in enterprise settings for its reliability and speed. SAS provides better performance than traditional SATA drives, particularly when dealing with high workloads, as it supports multiple concurrent connections and higher data throughput.

The ST936701SS and ST973401SS are also equipped with advanced features such as Seagate's Native Command Queuing (NCQ), which optimizes the order in which read and write commands are executed. This results in improved performance under multi-tasking conditions, essential for enterprise servers managing multiple requests simultaneously.

Additionally, both drives incorporate features aimed at enhancing data integrity and reliability. They support End-to-End Data Protection and are designed to endure the rigors of continuous operation, with MTBF (Mean Time Between Failures) ratings that bolster their reputation for durability.

Energy efficiency is another notable characteristic, as both drives are designed to reduce power consumption without sacrificing performance. This is particularly important in enterprise environments where power management contributes to lower operational costs.

In conclusion, the Seagate ST936701SS and ST973401SS drives are robust, reliable storage solutions tailored for enterprise applications. With their high performance, advanced technology features, and capacity options, they provide organizations with the scalability and efficiency required in today’s data-driven landscape. Whether it's for critical data management tasks or high-access applications, these drives stand out as a solid choice for any enterprise storage strategy.
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