NSC 74LS154

DM54LS154/DM74LS154 4-Line to 16-Line
Decoders/Demultiplexers
General Description
Features
Each of these 4-line-to-16-line decoders utilizes TTL circuitry 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 implementing high-performance memory decoders. All inputs are buffered and input clamping diodes are provided to minimize
transmission-line effects and thereby simplify system design.
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
C1995 National Semiconductor Corporation
TL/F/6394
RRD-B30M105/Printed in U. S. A.
DM54LS154/DM74LS154 4-Line to 16-Line Decoders/Demultiplexers
May 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
7V
Operating Free Air Temperature Range
b 55§ C to a 125§ C
DM54LS
DM74LS
0§ C to a 70§ C
b 65§ C to a 150§ C
Storage Temperature Range
Recommended Operating Conditions
Symbol
DM54LS154
Parameter
DM74LS154
Units
Min
Nom
Max
Min
Nom
Max
4.5
5
5.5
4.75
5
5.25
V
0.7
0.8
V
VCC
Supply Voltage
VIH
High Level Input Voltage
VIL
Low Level Input Voltage
IOH
High Level Output Current
b 0.4
b 0.4
mA
IOL
Low Level Output Current
4
8
mA
TA
Free Air Operating Temperature
70
§C
Electrical Characteristics
Symbol
2
2
b 55
125
V
0
over recommended operating free air temperature range (unless otherwise noted)
Parameter
Min
Typ
(Note 1)
DM54
2.5
3.4
DM74
2.7
3.4
Conditions
Max
Units
b 1.5
V
VI
Input Clamp Voltage
VCC e Min, II e b18 mA
VOH
High Level Output
Voltage
VCC e Min, IOH e Max
VIL e Max, VIH e Min
Low Level Output
Voltage
VCC e Min, IOL e Max
VIL e Max, VIH e Min
DM54
0.25
0.4
DM74
0.35
0.5
IOL e 4 mA, VCC e Min
DM74
0.25
0.4
VOL
V
V
II
Input Current @ Max
Input Voltage
VCC e Max, VI e 7V
IIH
High Level Input Current
VCC e Max, VI e 2.7V
20
mA
IIL
Low Level Input Current
VCC e Max, VI e 0.4V
b 0.4
mA
IOS
Short Circuit
Output Current
VCC e Max
(Note 2)
Supply Current
VCC e Max (Note 3)
ICC
0.1
DM54
b 20
b 100
DM74
b 20
b 100
9
14
mA
mA
mA
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, and the duration should not exceed one second.
Note 3: ICC is measured with all outputs open and all inputs grounded.
Switching Characteristics
Symbol
Parameter
at VCC e 5V and TA e 25§ C (See Section 1 for Test Waveforms and Output Load)
From (Input)
To (Output)
RL e 2 kX
CL e 15 pF
Min
Max
CL e 50 pF
Min
Units
Max
tPLH
Propagation Delay Time
Low to High Level Output
Data to
Output
30
35
ns
tPHL
Propagation Delay Time
High to Low Level Output
Data to
Output
30
35
ns
tPLH
Propagation Delay Time
Low to High Level Output
Strobe to
Output
20
25
ns
tPHL
Propagation Delay Time
High to Low Level Output
Strobe to
Output
25
35
ns
2
Function Table
Inputs
Outputs
G1
G2
D
C
B
A
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
L
H
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
X
X
X
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
X
X
X
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
X
X
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
X
X
X
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H e High Level, L e Low Level, X e Don’t Care
3
4
Physical Dimensions inches (millimeters)
24-Lead Ceramic Dual-In-Line Package (J)
Order Number DM54LS154J
NS Package Number J24A
24-Lead Wide Small Outline Molded Package (M)
Order Number DM74LS154WM
NS Package Number M24B
5
DM54LS154/DM74LS154 4-Line to 16-Line Decoders/Demultiplexers
Physical Dimensions inches (millimeters) (Continued)
24-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS154N
NS Package Number N24A
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
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
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and whose
failure to perform, when properly used in accordance
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
National Semiconductor
Corporation
1111 West Bardin Road
Arlington, TX 76017
Tel: 1(800) 272-9959
Fax: 1(800) 737-7018
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
National Semiconductor
Europe
Fax: (a49) 0-180-530 85 86
Email: cnjwge @ tevm2.nsc.com
Deutsch Tel: (a49) 0-180-530 85 85
English Tel: (a49) 0-180-532 78 32
Fran3ais Tel: (a49) 0-180-532 93 58
Italiano Tel: (a49) 0-180-534 16 80
National Semiconductor
Hong Kong Ltd.
13th Floor, Straight Block,
Ocean Centre, 5 Canton Rd.
Tsimshatsui, Kowloon
Hong Kong
Tel: (852) 2737-1600
Fax: (852) 2736-9960
National Semiconductor
Japan Ltd.
Tel: 81-043-299-2309
Fax: 81-043-299-2408
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.