For the Open Cable Detect signal, two drivers of SN75110 would be required
in parallel without termination to incrense the drive current in the
interface cable as shown in Figure 4.5.2.
r----------------------
-------------,
,
SN75110
,
,
Controller
______________ J
I
+SV
,
I
470n
20kn
+5V
-<'--..J\.J''''~_~
,
,
I
--<~"""'~
I
I
SN75 107/108
Unit selected
L ______
~~~
____________ _
Figure 4.5.2
Open cable detect
Power Sequence Pick and Hold must be set to ground in the controller.
------------,
r-----------------
Controller
I
I
,
I
I
P i c k '
~--~»~--------~/I~/------------~<~(-------~a'C
I
I
I
llold
-----4»~--------~/0~/----------___<~--------~----~--~
I
I
I
I
I
I
I
t
_ _ _ _ _ _ _ _ _ _ _ _ _ J
rri~
I
Drive
tonextdrive
L - - - - - - - - - - - - - - - - - -
Figure 4.5.3
Power sequence pick/hold
4 - 22
B03P-4825-0002A .•• Ol