SCSI Bus Interface
All assigned signals are terminated with 220 ohms to +5 VDC, or 180
ohms to 4.3 VDC (nominal) and 330 ohms to ground at each end of the
SCSI cable as shown in Figure 7-2.
+ 5 V (NOM)
Figure 7-2.
SCSI Bus Signals Termination
7.2.2.2
Input Signal Characteristics
When measured at the SCSI device's connection, each signal received
by a SCSI device has the following input characteristics:
•
Signal true = 0.0 VDC to 0.8 VDC
•
Maximum total input load = -0.4 milliamps at 0.4 VDC
•
Signal false = 2.0 VDC to 5.25 VDC
•
Minimum input hysteresis = 0.2 VDC
7-4 Interfaces
Содержание MD21/S2
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