Seagate ST318437LW Manual download pdf (Page 89)

Barracuda 36ES Product Manual, Rev. H 79

Output characteristics

Each signal (V

) 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 = < V

= < –1.55 V (signal negation/logic 0)

Steady state High level output voltage* = –.95 V = < V

= < 1.55 V (signal assertion/logic 1)

Differential voltage = +

0.6 V minimum with common-mode voltage ranges 0.700 V = < V

= < 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.

Figure 29. 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 = < V

= < 3.6 V (signal negation/logic 0)

Steady state High level output voltage* = –3.6 V = < V

= < –0.030 V (signal assertion/logic 1)

Differential voltage = +

0.30 V minimum with common-mode voltage ranges 0.700 V = < V

= < 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.

Figure 30. Typical SE-LVD alternative transmitter receiver circuits

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Seagate ST318437LW Manual Page 89