DM54LS154 DM74LS154 4-Line to 16-Line Decoders Demultiplexers
May 1989
DM54LS154 DM74LS154 4-Line to 16-Line
Decoders Demultiplexers
General Description
Each of these 4-line-to-16-line decoders utilizes TTL circuit-
ry to decode four binary-coded inputs into one of sixteen
mutually exclusive outputs when both the strobe inputs G1
and G2 are low The demultiplexing function is performed
by using the 4 input lines to address the output line passing
data from one of the strobe inputs with the other strobe
input low When either strobe input is high all outputs are
high These demultiplexers are ideally suited for implement-
ing high-performance memory decoders All inputs are buff-
ered and input clamping diodes are provided to minimize
transmission-line effects and thereby simplify system de-
sign
Features
Y
Y
Y
Y
Y
Y
Decodes 4 binary-coded inputs into one of 16 mutually
exclusive outputs
Performs the demultiplexing function by distributing data
from one input line to any one of 16 outputs
Input clamping diodes simplify system design
High fan-out low-impedance totem-pole outputs
Typical propagation delay
3 levels of logic 23 ns
Strobe 19 ns
Typical power dissipation 45 mW
Connection and Logic Diagrams
Dual-In-Line Package
TL F 6394–1
Order Number DM54LS154J
DM74LS154WM or DM74LS154N
See NS Package Number J24A M24B or N24A
TL F 6394 – 2
C
1995 National Semiconductor Corporation
TL F 6394
RRD-B30M105 Printed in U S A
(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
7V
Operating Free Air Temperature Range
b
55 C to
a
125 C
DM54LS
DM74LS
0 C to
a
70 C
Storage Temperature Range
b
65 C to
a
150 C
Absolute Maximum Ratings
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
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Parameter
Min
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
b
55
DM54LS154
Nom
5
Max
55
07
b
0 4
DM74LS154
Min
4 75
2
08
b
0 4
Units
Max
5 25
V
V
V
mA
mA
C
Nom
5
45
2
4
125
0
8
70
Electrical Characteristics
Symbol
V
I
V
OH
V
OL
Parameter
Input Clamp Voltage
High Level Output
Voltage
Low Level Output
Voltage
over recommended operating free air temperature range (unless otherwise noted)
Conditions
V
CC
e
Min I
I
e b
18 mA
V
CC
e
Min I
OH
e
Max
V
IL
e
Max V
IH
e
Min
V
CC
e
Min
V
IL
e
Max
I
OL
e
Max
V
IH
e
Min
Min
Typ
(Note 1)
34
34
0 25
0 35
0 25
04
05
04
01
20
b
0 4
Max
b
1 5
Units
V
V
DM54
DM74
DM54
DM74
DM74
25
27
V
I
OL
e
4 mA V
CC
e
Min
I
I
I
IH
I
IL
I
OS
I
CC
Input Current
Input Voltage
Max
V
CC
e
Max V
I
e
7V
V
CC
e
Max V
I
e
2 7V
V
CC
e
Max V
I
e
0 4V
V
CC
e
Max
(Note 2)
V
CC
e
Max (Note 3)
mA
mA
mA
mA
mA
High Level Input Current
Low Level Input Current
Short Circuit
Output Current
Supply Current
DM54
DM74
b
20
b
20
b
100
b
100
9
14
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 and the duration should not exceed one second
Note 3
I
CC
is measured with all outputs open and all inputs grounded
Switching Characteristics
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
Parameter
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
at V
CC
e
5V and T
A
e
25 C (See Section 1 for Test Waveforms and Output Load)
From (Input)
To (Output)
Data to
Output
Data to
Output
Strobe to
Output
Strobe to
Output
R
L
e
2 kX
C
L
e
15 pF
Min
Max
30
30
20
25
C
L
e
50 pF
Min
Max
35
35
25
35
ns
ns
ns
ns
Units
2
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