TL F 9785
54279DM74279
Quad
Set-Reset
Latch
June 1989
54279 DM74279 Quad Set-Reset Latch
General Description
This device contains four independent set-reset type flip-
flops with one Q output each
Connection Diagram
Dual-In-Line Package
TL F 9785 1
Order Number 54279DMQB 54279FMQB or DM74279N
NS Package Number J16A N16E or W16A
Pin Names
Description
R
n
Reset Inputs (Active Low)
S
n
Set Inputs (Active Low)
Q
Outputs
Truth Table
Inputs
Output
S1
S2
R
Q
L
L
L
h
L
X
H
H
X
L
H
H
H
H
L
L
H
H
H
No Change
H
e
HIGH Voltage Level
L
e
LOW Voltage Level
X
e
Immaterial
h
e
The output is HIGH as long as S1 or S2 is LOW If all inputs go HIGH
simultaneously the output state is indeterminate otherwise it follows the
Truth Table
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings
(Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
5 5V
Operating Free Air Temperature Range
54
b
55 C to
a
125 C
DM74
0 C to
a
70 C
Storage Temperature Range
b
65 C to
a
150 C
Note
The ``Absolute Maximum Ratings'' are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ``Electrical Characteristics''
table are not guaranteed at the absolute maximum ratings
The ``Recommended Operating Conditions'' table will define
the conditions for actual device operation
Recommended Operating Conditions
Symbol
Parameter
54279
DM74279
Units
Min
Nom
Max
Min
Nom
Max
V
CC
Supply Voltage
4 5
5
5 5
4 75
5
5 25
V
V
IH
High Level Input Voltage
2
2
V
V
IL
Low Level Input Voltage
0 8
0 8
V
I
OH
High Level Output Current
b
0 8
b
0 8
mA
I
OL
Low Level Output Current
16
16
mA
T
A
Free Air Operating Temperature
b
55
125
0
70
C
Electrical Characteristics
over Recommended Operating Free Air Temperature Range (Unless Otherwise Noted)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 1)
V
I
Input Clamp Voltage
V
CC
e
Min I
I
e b
12 mA
b
1 5
V
V
OH
High Level
V
CC
e
Min I
OH
e
Max
2 4
3 4
V
Output Voltage
V
IL
e
Max
V
OL
Low Level
V
CC
e
Min I
OL
e
Max
0 2
0 4
V
Output Voltage
V
IH
e
Min
I
I
Input Current
Max
V
CC
e
Max V
I
e
5 5V
1
mA
Input Voltage
I
IH
High Level Input Current
V
CC
e
Max V
I
e
2 4V
40
m
A
I
IL
Low Level Input Current
V
CC
e
Max V
I
e
0 4V
b
1 6
mA
I
OS
Short Circuit
V
CC
e
Max
54
b
20
b
55
mA
Output Current
(Note 2)
DM74
b
18
b
57
I
CC
Supply Current
V
CC
e
Max R
e
0V
30
mA
Switching Characteristics
Symbol
Parameter
54 DM74
Units
Min
Max
t
PLH
Propagation Delay
22
ns
t
PHL
S to Q
15
t
PHL
Propagation Delay
27
ns
R to Q
Note 1
All typicals are at V
CC
e
5V T
A
e
25 C
Note 2
Not more than one output should be shorted at a time
2
54279DM74279
Quad
Set-Reset
Latch
Physical Dimensions
inches (millimeters) (Continued)
16-Lead Ceramic Flat Package (W)
Order Number 54279FMQB
NS Package Number W16A
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
2 A critical component is any component of a life
systems which (a) are intended for surgical implant
support device or system whose failure to perform can
into the body or (b) support or sustain life and whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system or to affect its safety or
with instructions for use provided in the labeling can
effectiveness
be reasonably expected to result in a significant injury
to the user
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