Model 8903B
SCHEMATIC
SYMBOLOGY
AND SCHEMATIC DIAGRAM
NOTES
Trrhls
8-6.
Schcmalic
Diagram
Nolcs
(5
of'
I
I)
Service
z
&
11
zm
=1
=m
DIGITAL SYMBOLOGY REFERENCE INFORMATION
Combinational Logic
Symbols
and Functions
Summing Junction-Outputs added together at a common point.
AND-All inputs must be active for the output to be active.
OR-One or more inputs being active will cause the output to be active.
Logic Threshold-m or more inputs being active will cause the output to be active
(replace m with a number).
EXCLUSIVE OR-Output will be active when one (and only one) input is active.
m
and only m-Output will be active when
m
(and only m) inputs are active (replace
m with a number).
Logic Identity-Output will be active only when all or none of the inputs are active
(i.e., when all inputs are identical, output will be active).
Amplifier-The output will be active only when the input is active (can be used with
polarity or logic indicator at input or output to signify inversion).
Signal Level Converter-Input level(s) are different than output level(s).
Bilateral Switch-Binary controlled switch which acts as an on/off switch to analog
or binary signals flowing in both directions. Dependency notation should be used
to indicate affectinglaffected inputs and outputs. Note: amplifier symbol (with depen-
dency notation) should be read
to
indicate unilateral switching.
x-Y
Coder-Input code
(X)
is
converted to output code
(Y)
per weighted values or a table.
(Functional Labels)
The following labels are to be used as necessary to ensure rapid identification of
device function.
MUX
Multiplexer-The output is dependent only on the selected input.
DEMUX
Demultiplexer-Only the selected output is a function
of
the input.
CPU Central Processing Unit
8-25
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