Service
Model
8901B
nble
8A-6.
Schematic Diagram
Notes
(10
of
11)
Active High Input
Active
El-
High Output
-43
Active Low Input
I
ACTIVE LEVELS
A-L
ACTIVE
HIGH
inputs and outputs are indicated by the ab-
ACTIVE
it
sence of the polarity indicator symbol.
4
LEVEL
I
ACTIVE LOW inputs and outputs are indicated by the pres-
<
?
ence of the polarity indicator symbol
(
b).
I
LEVEL
I
-J
ACTIVE
EDGE SENSITIVE INPUTS
Active Low Output
J
11
lNpUT2-L
EDGE SENSITIVE (low-to-high) inputs are indicated by the
presence
of
the dynamic indicator symbol
(-0).
Low-to-High OUTPUT
I
1
Edge Sensitive
.9-FlNPUTJ-p
EDGE SENSITIVE (high-to-low) inputs are indicated by the
presence of both the dynamic indicator and the polarity in-
dicator symbols
(
-E$
).
I1
High-to-Low OUTPUT
Edge Sensitive
DELAYED OUTPUT RESPONSE
iNPuTJ-%
I
-OUTPUT Delayed Output,
I
r
OUTPUT DELAY indicator symbol
(7
)
shows that the out-
put becomes effective affer the input signal returns to its
inactive state.
(Active High Input)
I
Delayed Output
(Active Low Input)
I
INHIBIT INPUTS
INHIBIT indicator symbol
(+)
indicates an input that, when
active, inhibits (blocks) the output(s) from achieving their
active states (the outputs remain inactive).
*
ANALOG LINES
ANALOG indicator symbol
(n)
indicates a line that has
an analog input or output.
NONLOGIC CONNECTION
The Nonlogic Connection symbol
(X)
indicates
a
connec-
tion that does not carry any logic information.
*
SA-19
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