NSC 54279

54279/DM74279 Quad Set-Reset Latch
General Description
This device contains four independent set-reset type flipflops 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
Rn
Sn
Q
Description
Reset Inputs (Active Low)
Set Inputs (Active Low)
Outputs
Truth Table
S1
Inputs
S2
R
Output
Q
L
L
X
H
H
L
X
L
H
H
L
H
H
L
H
h
H
H
L
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
TL/F/9785
RRD-B30M115/Printed in U. S. A.
54279/DM74279 Quad Set-Reset Latch
June 1989
Absolute Maximum Ratings (Note)
Note: The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaranteed. 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.
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
b 55§ C to a 125§ C
54
DM74
0§ C to a 70§ C
b 65§ C to a 150§ C
Storage Temperature Range
Recommended Operating Conditions
Symbol
54279
Parameter
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
IOH
High Level Output Current
IOL
Low Level Output Current
TA
Free Air Operating Temperature
DM74279
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.75
5
5.25
2
V
2
V
0.8
0.8
V
b 0.8
b 0.8
mA
16
mA
70
§C
16
b 55
125
0
Electrical Characteristics
over Recommended Operating Free Air Temperature Range (Unless Otherwise Noted)
Symbol
VI
Parameter
Conditions
Input Clamp Voltage
VCC e Min, II e b12 mA
VOH
High Level
Output Voltage
VCC e Min, IOH e Max,
VIL e Max
VOL
Low Level
Output Voltage
VCC e Min, IOL e Max,
VIH e Min
II
Input Current @ Max
Input Voltage
VCC e Max, VI e 5.5V
IIH
High Level Input Current
IIL
IOS
ICC
Min
2.4
Typ
(Note 1)
Max
Units
b 1.5
V
3.4
0.2
V
0.4
V
1
mA
VCC e Max, VI e 2.4V
40
mA
Low Level Input Current
VCC e Max, VI e 0.4V
b 1.6
mA
Short Circuit
Output Current
VCC e Max
(Note 2)
Supply Current
VCC e Max, R e 0V
54
b 20
b 55
DM74
b 18
b 57
30
mA
Switching Characteristics
Symbol
54/DM74
Parameter
Min
Units
Max
tPLH
tPHL
Propagation Delay
S to Q
22
15
ns
tPHL
Propagation Delay
R to Q
27
ns
Note 1: All typicals are at VCC e 5V, TA e 25§ C.
Note 2: Not more than one output should be shorted at a time.
2
mA
Physical Dimensions inches (millimeters)
16-Lead Ceramic Dual-In-Line Package (J)
Order Number 54279DMQB
NS Package Number J16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74279N
NS Package Number N16E
3
54279/DM74279 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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