Table of Contents
Advertisement
Schematic Notes
Model 11848A
Table 8. Schematic Diagram Notes (5 of 11)
DIGITAL SYMBOLOGY REFERENCE INFORMATION
2
&
>1
>m
=1
=m
X/Y
X-*Y
(Functional Labels)
MUX
DEMUX
CPU
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 affecting/affected inputs and outputs. Note: amplifier symbol (with depen
dency notation) should be read to indicate unilateral switching.
Coder—Input code (X) is converted to output code (Y) per weighted values or a table.
The following labels are to be used as necessary to ensure rapid identification of
device function.
Multiplexer—The output is dependent only on the selected input.
Demultiplexer—Only the selected output is a function of the input.
Central Processing Unit
82
Advertisement
Table of Contents
