Справочник Пользователя для Seagate ST336938LW

Each signal (V

s

) 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

s

 = < –1.55 V (signal negation/logic 0)

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

s

 = < 1.55 V (signal assertion/logic 1)

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

cm

 = < 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.

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

s

 = < 3.6 V (signal negation/logic 0)

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

s

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

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

cm

 = < 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.