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National Semiconductor Electronic Components Datasheet

54279 Datasheet

Quad Set-Reset Latch

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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
June 1989
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
Inputs
S1 S2
R
Output
Q
L LL
h
L XH
H
X LH
H
H HL
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 TL F 9785
RRD-B30M115 Printed in U S A


National Semiconductor Electronic Components Datasheet

54279 Datasheet

Quad Set-Reset Latch

No Preview Available !

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 b55 C to a125 C
DM74
0 C to a70 C
Storage Temperature Range
b65 C to a150 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
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
Min
45
2
b55
54279
Nom
5
Max
55
08
b0 8
16
125
Min
4 75
2
0
DM74279
Nom
5
Max
5 25
08
b0 8
16
70
Units
V
V
V
mA
mA
C
Electrical Characteristics
over Recommended Operating Free Air Temperature Range (Unless Otherwise Noted)
Symbol
Parameter
Conditions
VI
VOH
VOL
II
IIH
IIL
IOS
ICC
Input Clamp Voltage
High Level
Output Voltage
Low Level
Output Voltage
Input Current Max
Input Voltage
High Level Input Current
Low Level Input Current
Short Circuit
Output Current
Supply Current
VCC e Min II e b12 mA
VCC e Min IOH e Max
VIL e Max
VCC e Min IOL e Max
VIH e Min
VCC e Max VI e 5 5V
VCC e Max VI e 2 4V
VCC e Max VI e 0 4V
VCC e Max
(Note 2)
54
DM74
VCC e Max R e 0V
Min
24
b20
b18
Typ
(Note 1)
34
02
Max
b1 5
04
1
40
b1 6
b55
b57
30
Units
V
V
V
mA
mA
mA
mA
mA
Switching Characteristics
Symbol
Parameter
tPLH
tPHL
Propagation Delay
S to Q
tPHL
Propagation Delay
R to Q
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
54 DM74
Min Max
22
15
27
Units
ns
ns
2


Part Number 54279
Description Quad Set-Reset Latch
Maker National Semiconductor
Total Page 4 Pages
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