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specification.
Each signal
from
the host
to
the controller must have the
following characteristics:
True
(Signal Assertion)
=
0.0 to 0.8 VDC
@
.4mA (max.)
False (Signal Non-Assertion)
=
2.0 to 5.25 VDC.
A 74LS14 receiver with hysteresis meets this specification.
Figure 4-1 shows an example of proper bus termination.
74LS240
CONTROLLER
+5
20 FEET
(6 METERS)
MAXIMUM
220!!
330B
"TYPICAL HOST ADAPTOR
+5
220B
330n
74LS14
Figure 4-1.
Host Adapter Bus Termination
4.1.7
CONNECTION DIAGRAM
A 50-pin latching connector
is provided at position J8 for
connect ing to the SCS I bus.
The SCS I sing Ie-ended non-sh ielded
connection is used.
All signals are asserted at the low level.
All odd pins are grounded.
A maximum cable length of 20 feet (6
meters) is allowed.
Figure 4-2 shows the SCSI connection pins.
500504-00
4-11
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