54154.pdf
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Pobierz
June 1989
54154/DM54154/DM74154
4-Line to 16-Line Decoders/Demultiplexers
General Description
Each or 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
Decodes 4 binary-coded inputs into one of 16 mutually
exclusive outputs
Y
Performs the demultiplexing function by distributing data
from one input line to any one of 16 outputs
Y
Input clamping diodes simplify system design
Y
High fan-out, low-impedance, totem-pole outputs
Y
Typical propagation delay
3 levels of logic 19 ns
Strobe 18 ns
Y
Typical power dissipation 170 mW
Y
Alternate Military/Aerospace device (54154) is avail-
able. Contact a National Semiconductor Sales Office/
Distributor for specifications.
Connection Diagram
Dual-In-Line Package
TL/F/6548±1
Order Number 54154DMQB, 54154FMQB, DM54154J or DM74154N
See NS Package Number J24A, N24A or W24C
C
1995 National Semiconductor Corporation
TL/F/6548
RRD-B30M105/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
Note: The ``AbsoluteMaximumRatings'' are those values
beyondwhich the safety of thedevice cannot be guaran-
teed.Thedeviceshouldnotbeoperatedattheselimits.The
parametricvaluesdefinedinthe``ElectricalCharacteristics''
tablearenotguaranteedattheabsolutemaximumratings.
The``RecommendedOperatingConditions''tablewilldefine
theconditionsforactualdeviceoperation.
7V
Input Voltage
5.5V
Operating Free Air Temperature Range
DM54 and 54
b
55
§
Cto
a
125
§
C
DM74
0
§
Cto
a
70
§
C
Storage Temperature Range
b
65
§
Cto
a
150
§
C
Recommended Operating Conditions
DM54154
DM74154
Symbol
Parameter
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)
Typ
Symbol
Parameter
Conditions
Min
Max
Units
(Note 1)
V
CC
e
Min, I
I
eb
12 mA
b
1.5
V
I
Input Clamp Voltage
V
V
OH
High Level Output
V
CC
e
Min, I
OH
e
Max
2.4
3.2
V
Voltage
V
IL
e
Max, V
IH
e
Min
V
CC
e
Min, I
OL
e
Max
V
OL
Low Level Output
0.25
0.4
V
V
IH
e
Min, V
IL
e
Max
Voltage
I
I
Input Current
@
Max
V
CC
e
Max, V
I
e
5.5V
1
mA
Input Voltage
V
CC
e
Max, V
I
e
2.4V
I
IH
High Level Input Current
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
DM54
b
20
b
55
mA
Output Current
(Note 2)
b
18
b
57
DM74
I
CC
Supply Current
V
CC
e
Max
DM54
34
49
mA
(Note 3)
DM74
34
56
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.
Note 3: I
CC
is measured with all outputs open and all inputs grounded.
Switching Characteristics
at V
CC
e
5V and T
A
e
25
§
C (See Section 1 for Test Waveforms and Output Load)
From (Input)
R
L
e
400
X
,C
L
e
15 pF
Symbol
Parameter
Units
To (Output)
Min
Max
t
PLH
Propagation Delay Time
Data to
36
ns
Low to High Level Output
Output
t
PHL
Propagation Delay Time
Data to
33
ns
High to Low Level Output
Output
t
PLH
Propagation Delay Time
Strobe to
30
ns
Low to High Level Output
Output
t
PHL
Propagation Delay Time
Strobe to
27
ns
High to Low Level Output
Output
2
Function Table
Inputs Outputs
1 2DCBA0123456789012345
LLLLLLLHHHHHHHHHHHHHHH
L LLLLHHLHHHHHHHHHHHHHH
L LLLHLHHLHHHHHHHHHHHHH
L LLLHHHHHLHHHHHHHHHHHH
L LLHLLHHHHLHHHHHHHHHHH
L LLHLHHHHHHLHHHHHHHHHH
L LLHHLHHHHHHLHHHHHHHHH
L LLHHHHHHHHHHLHHHHHHHH
L LHLLLHHHHHHHHLHHHHHHH
L LHLLHHHHHHHHHHLHHHHHH
L LHLHLHHHHHHHHHHLHHHHH
L LHLHHHHHHHHHHHHHLHHHH
L LHHLLHHHHHHHHHHHHLHHH
L LHHLHHHHHHHHHHHHHHLHH
L LHHHLHHHHHHHHHHHHHHLH
L LHHHHHHHHHHHHHHHHHHHL
LHXXXXHHHHHHHHHHHHHHHH
HLXXXXHHHHHHHHHHHHHHHH
HHXXXXHHHHHHHHHHHHHHHH
H
e
High Level, L
e
Low Level, X
e
Don't Care
Logic Diagram
TL/F/6548±2
3
4
Physical Dimensions
inches (millimeters)
24-Lead Ceramic Dual-In-Line Package (J)
Order Number 54154DMQB or DM54154J
NS Package Number J24A
24-Lead Molded Dual-In-Line Package (N)
Order Number DM74154N
NS Package Number N24A
5
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