Seagate ST336705LW/LC, ST318405LW/LC, ST39205LW/LC Output characteristics, Input characteristics

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70	Cheetah 36XL Product Manual, Rev. E

Output characteristics

Each signal (Vs) driven by LVD interface drivers shall have the following output characteristics when measured at the disc drive connector:

Steady state Low level output voltage* = –.95 V = < Vs = < –1.55 V (signal negation/logic 0) Steady state High level output voltage* = –.95 V = < Vs = < 1.55 V (signal assertion/logic 1) Differential voltage = +0.6 V minimum with common-mode voltage ranges 0.700 V = < Vcm = < 1.800 V.

*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference.

The output characteristics shall additionally conform to EIA RS-485.

	STEADY STATE	–SIGNAL	100Ω
		–SIGNAL	V1

	LOGIC INPUT
	LOGIC INPUT
	(1 OR 0)
	D	Vs	75Ω
			100Ω
		+SIGNAL	V2
		+SIGNAL

MEASURED

PARAMETER

DEVICE CONNECTOR

Figure 24. LVD output signals

Input characteristics

Each signal (Vs) received by LVD interface receiver circuits shall have the following input characteristics when measured at the disk drive connector:

Steady state Low level output voltage* = 0.030 V = < Vs = < 3.6 V (signal negation/logic 0) Steady state High level output voltage* = –3.6 V = < Vs = < –0.030 V (signal assertion/logic 1)

Differential voltage = +0.30 V minimum with common-mode voltage ranges 0.700 V = < Vcm = < 1.800 V. (X3T10/1302D)

*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference.

Input characteristics shall additionally conform to EIA RS-485-983.

	VCCA		VCCB
Single	LVD Signal Drivers	Single	Single
Single		Single	Single
Ended		Ended	Ended
Circuitry		Receiver	Negation
	LVD		Driver
	LVD
	Receiver
Single			Single
Ended			Ended
Ground			Assertion
Driver			Driver
	LVD Signal Drivers
Ground

Single Ended:	GND	–Signal
LVD:	+Signal	–Signal

Figure 25. Typical SE-LVD alternative transmitter receiver circuits

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Contents Cheetah 36XL Family ST336705LW/LC ST318405LW/LC ST39205LW/LC Page Cheetah 36XL Family ST336705LW/LC ST318405LW/LC ST39205LW/LC Page Revision status summary sheet Revision Date Writer/Engineer Sheets AffectedPage Contents Defect and error management InstallationSeagate Technology support services Interface requirementsList of Figures Cheetah 36XL Product Manual, Rev. E ViiPage Scope Cheetah 36XL family drive ST336705LC shownCheetah 36XL Product Manual, Rev. E Applicable standards and reference documentation Taiwanese Bsmi Australian C-TickKorean MIC General description Cheetah 36XL family drive Cheetah 36XL Product Manual, Rev. E Standard features Media characteristicsPerformance ReliabilityFactory installed accessories Options factory installedFormatted capacities Programmable drive capacityPerformance characteristics Prefetch/multi-segmented cache control Ultra2 Scsi Ultra160 ScsiStart/stop time Cache operation Caching write dataPrefetch operation Cheetah 36XL Product Manual, Rev. E Cheetah 36XL Product Manual, Rev. E Reliability specifications Reliability and service Preventive maintenanceService life Service philosophy7 S.M.A.R.T Controlling S.M.A.R.TPerformance impact Reporting controlDetermining rate Predictive failuresState of the drive prior to testing DST Failure DefinitionImplementation Invoking DSTProduct warranty Short test Function Code 001bExtended test Function Code 010b Log page entriesProduct repair and return information Cheetah 36XL Product Manual, Rev. E DC power requirements Physical/electrical specificationsAC power requirements 3 12 V Current profile Power sequencingConducted noise immunity Typical ST336705 drive +12 V current profile Typical ST39205 drive +12 V current profile TypicalST318405 drive +5 V current profile Power dissipation ST336705 Cheetah 36XL Product Manual, Rev. E ST318405 Os per SecondEnvironmental limits TemperatureST39205 Relative humidity Effective altitude sea levelShock and vibration ShockPackage size Packaged/product weight Drop height Recommended mounting Acoustics Air cleanlinessVibration LW mounting configuration dimensions LC mounting configuration dimensions Drive internal defects Defect and error managementDrive error recovery procedures Scsi systems errors Installation Configure drive optionsFormatting Drive ID/option select headerDo not install jumpers retain cover J5 jumper header on LW model only J2 option select header Cheetah 36XL Product Manual, Rev. E Function description Does not apply to LC modelsDrive orientation CoolingDrive mounting GroundingInterface requirements Scsi interface messages supportedScsi interface commands supported Cheetah 36XL Product Manual, Rev. E Commands supported by Cheetah 36XL family drive Mode Sense data Inquiry Vital Product dataCheetah 36XL Product Manual, Rev. E Mode Sense Data Cheetah 36XL Product Manual, Rev. E Mode sense data, ST318405 values Bytes Cheetah 36XL Product Manual, Rev. E Mode sense data, ST39205 values Bytes Cheetah 36XL Product Manual, Rev. E Condition/features supported Physical interface DC cable and connector2 REQ/ACK offset Pin Power Scsi interface physical description Scsi interface cable requirementsMating connectors Mating connectors for LW model drivesMating connectors for LC model drives ST336705LC, ST318405LC and ST39205LCRight-angle to Pcba connectors Scsi IDNonshielded 68 pin Scsi device connector used on LW drives Nonshielded 80 pin Scsi SCA-2 connector, used on LC drives GND +DBP1 Charge 68Cheetah 36XL Product Manual, Rev. E Multimode-SE and LVD alternatives Multimode signalsElectrical description Output characteristics Input characteristicsGeneral cable characteristics Terminator requirements Terminator power LW drivesLow voltage differential I/O circuits LC drivesDisc drive Scsi timing Drive activity remote LED signal status Cheetah 36XL Product Manual, Rev. E Seagate Technology support services Online Services Automated ServicesPresales Support Technical SupportEuropean Support Services Customer Service CSOUSA/Canada/Latin America Support Services Call Center Toll-free Direct dial Africa/Middle East Support ServicesAsia/Pacific Support Services Cheetah 36XL Product Manual, Rev. E Index Symbols Cheetah 36XL Product Manual, Rev. E LED PCB System chassis Page