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7901A
A-74.
In most instances, the amplifier symbol has a non-
binary input. A circuit which restores the voltage level of a
binary input, or which furnishes a low-impedance output
from a binary input, is indicated by a one-input "and" gate
symbol. An inverting dot at the output of an amplifier sym-
bol indicates that the amplifier inverts the input signal.
A-75.
Figure A-31 is the symbol for a phase splitter.
A--{>=:
7900-136
Figure A-31. Phase-Splitter Logic Symbol
A-76.
MULTIPURPOSE LOGIC SYMBOL.
A-77.
The multipurpose logic symbol is used to indicate
a logic function that has not received a standardized logic
symbol. The multipurpose symbol is also used to depict
multiple logic elements that act together to perform a single
overall logic function such as decoding, data storage, or
counting. The symbol shown in figure A-32 may be of vary-
ing proportions (mostly commonly 2:1 or 1:2), but rec-
tangular in shape. The symbol includes a descriptive name
indicating the overall logic function performed. All active
inputs should be labeled to indicate the effect on the overall
function. Other descriptive information may be included as
needed.
Logic Symbology
-
~
-
FUNCTION
7900-137
Figure A-32. Multipurpose Logic Symbol
A-78.
Examples of nonstandard symbols are given in fig-
ure A-33. Figure A-33a shows a binary-to-octal decoder.
Figure A-33b shows a four-bit up/down counter.
Figure A-33. Nonstandard Logic Symbols
A-9/A-10
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