Seagate ST34520N - Medalist 4.55 GB Hard Drive, Product Manual

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72 Medalist Pro Product Manual, Rev. D
Output characteristics
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.
Figure 24. LVD output signals
Input characteristics
Each signal (Vs) received by LVD interface receiver circuits shall have the following input characteristics when
measuared 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.
(X3T10/1142D revision 13, p. 152)
*These voltages shall be measured between the output terminal and the SCSI device’s logic ground reference.
This requirement shall be met with the input voltage varying between 0.700 V and 1.8 V, with power on or off,
and with the hysteresis equaling TBD mV, minimum.
Input characteristics shall additionally conform to EIA RS-485-983.
Signal –
LVD Differential
Driver
1.55V
V
0
= True / Logic 1 / Assertion
–15ma
.95V +15ma
Signal –
LVD Differential
Driver
.95V
V
0
= False / Logic 0 / Negation
|V
0
| = .6V
+15ma
1.55V –15ma