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Model 7475A
INDICATOR SYMBOLS !Continued)
.r::r
SCHMITT TRIGGER
l-D" I
=B-
Schmitt Trigger-.cr indicates that hysteresis exists
in the device.
GATE
AND
1-A-4-1
AND GATE
WITH
HYSTERESIS
Dependency Notation
The input that controls or gates other inputs is
labeled with a "C" or a "G", followed by an identi-
fying number. The controlled or gated input or
output is labeled with the same number. In this
example, "1" is controlled by "G 1 ".
When the controlled or gated input or output
already has a functional label (Xis used here),
that label will be prefixed or subscripted by
the identifying number.
If a particular device has only one gating or control
input then the identifying number may be elimina·
ted and the relationship shown with a subscript.
If the input or output is affected by more than
one gate or control input, then the identifying
numbers of each gate or control input will appear
in the prefix or subscript, separated by commas.
In this example "X" is controlled by "G1" and
"G2".
IEEE STANDARD 91
FLIP
ANSI Y32.14
TRUTH TABLE
FLOP
~
A
B
c
L
L
L
H
H
H
R-S
~
L
H
L
H
L
L
ANSI Y32.14
CONTROL
DESIGNATIONS
FOR F.F.
,..-
RFF
a
-
r--
-
s
~
....__
Figure 6-23. ANSI Y32.14 Logic Symbols (Sheet 2 of 6)
Section VI
DESCRIPTION
-
R
s
a
a
L
L
N/C N/C
L
H
H
L
H
L
L
H
H
H undetermined
6-21
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