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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